# Table of Contents

- [Introduction - Pyproject.nix](#introduction-pyproject-nix)
- [Page not found · GitHub Pages](#page-not-found-github-pages)
- [Page not found · GitHub Pages](#page-not-found-github-pages)
- [Page not found · GitHub Pages](#page-not-found-github-pages)
- [Page not found · GitHub Pages](#page-not-found-github-pages)
- [Page not found · GitHub Pages](#page-not-found-github-pages)
- [Page not found · GitHub Pages](#page-not-found-github-pages)
- [Page not found · GitHub Pages](#page-not-found-github-pages)
- [Page not found · GitHub Pages](#page-not-found-github-pages)
- [Page not found · GitHub Pages](#page-not-found-github-pages)
- [Page not found · GitHub Pages](#page-not-found-github-pages)
- [Page not found · GitHub Pages](#page-not-found-github-pages)
- [Page not found · GitHub Pages](#page-not-found-github-pages)
- [Page not found · GitHub Pages](#page-not-found-github-pages)
- [Page not found · GitHub Pages](#page-not-found-github-pages)
- [Page not found · GitHub Pages](#page-not-found-github-pages)
- [Page not found · GitHub Pages](#page-not-found-github-pages)
- [Page not found · GitHub Pages](#page-not-found-github-pages)
- [Page not found · GitHub Pages](#page-not-found-github-pages)
- [Page not found · GitHub Pages](#page-not-found-github-pages)
- [Page not found · GitHub Pages](#page-not-found-github-pages)
- [Page not found · GitHub Pages](#page-not-found-github-pages)
- [Page not found · GitHub Pages](#page-not-found-github-pages)
- [Page not found · GitHub Pages](#page-not-found-github-pages)
- [Page not found · GitHub Pages](#page-not-found-github-pages)
- [Page not found · GitHub Pages](#page-not-found-github-pages)
- [Page not found · GitHub Pages](#page-not-found-github-pages)
- [Page not found · GitHub Pages](#page-not-found-github-pages)
- [Page not found · GitHub Pages](#page-not-found-github-pages)
- [Page not found · GitHub Pages](#page-not-found-github-pages)
- [Page not found · GitHub Pages](#page-not-found-github-pages)
- [Page not found · GitHub Pages](#page-not-found-github-pages)
- [Page not found · GitHub Pages](#page-not-found-github-pages)
- [Page not found · GitHub Pages](#page-not-found-github-pages)
- [Page not found · GitHub Pages](#page-not-found-github-pages)
- [Page not found · GitHub Pages](#page-not-found-github-pages)
- [Page not found · GitHub Pages](#page-not-found-github-pages)
- [Page not found · GitHub Pages](#page-not-found-github-pages)
- [Page not found · GitHub Pages](#page-not-found-github-pages)
- [Page not found · GitHub Pages](#page-not-found-github-pages)
- [Page not found · GitHub Pages](#page-not-found-github-pages)
- [Page not found · GitHub Pages](#page-not-found-github-pages)
- [Page not found · GitHub Pages](#page-not-found-github-pages)
- [Unknown](#unknown)
- [Introduction - uv2nix](#introduction-uv2nix)
- [Installation - uv2nix](#installation-uv2nix)
- [Builders - Pyproject.nix](#builders-pyproject-nix)
- [uv2nix](#uv2nix)
- [Introduction - uv2nix](#introduction-uv2nix)
- [Source filtering - uv2nix](#source-filtering-uv2nix)
- [Overriding - uv2nix](#overriding-uv2nix)
- [requirements.txt - Pyproject.nix](#requirements-txt-pyproject-nix)
- [Platform quirks - uv2nix](#platform-quirks-uv2nix)
- [Usage - Pyproject.nix](#usage-pyproject-nix)
- [Overriding build systems - uv2nix](#overriding-build-systems-uv2nix)
- [Advanced build systems (editables) - uv2nix](#advanced-build-systems-editables-uv2nix)
- [Getting started - uv2nix](#getting-started-uv2nix)
- [overriding packages - Pyproject.nix](#overriding-packages-pyproject-nix)
- [Flake Templates - uv2nix](#flake-templates-uv2nix)
- [Shipping applications - uv2nix](#shipping-applications-uv2nix)
- [hacks - Pyproject.nix](#hacks-pyproject-nix)
- [pep508 - Pyproject.nix](#pep508-pyproject-nix)
- [Pyproject.nix](#pyproject-nix)
- [Conflicts support - uv2nix](#conflicts-support-uv2nix)
- [Using meta - uv2nix](#using-meta-uv2nix)
- [Patching packages - uv2nix](#patching-packages-uv2nix)
- [Inline script metadata - uv2nix](#inline-script-metadata-uv2nix)
- [FAQ - uv2nix](#faq-uv2nix)
- [hacks - Pyproject.nix](#hacks-pyproject-nix)
- [Cross compilation - uv2nix](#cross-compilation-uv2nix)
- [packages - Pyproject.nix](#packages-pyproject-nix)
- [pyproject.toml - Pyproject.nix](#pyproject-toml-pyproject-nix)
- [project - Pyproject.nix](#project-pyproject-nix)
- [ecosystem - Pyproject.nix](#ecosystem-pyproject-nix)
- [pep518 - Pyproject.nix](#pep518-pyproject-nix)
- [Testing - uv2nix](#testing-uv2nix)
- [pep440 - Pyproject.nix](#pep440-pyproject-nix)
- [validators - Pyproject.nix](#validators-pyproject-nix)
- [renderers - Pyproject.nix](#renderers-pyproject-nix)
- [Introduction - Pyproject.nix](#introduction-pyproject-nix)
- [Development scripts - uv2nix](#development-scripts-uv2nix)
- [Installation - Pyproject.nix](#installation-pyproject-nix)
- [Private packages - uv2nix](#private-packages-uv2nix)
- [Installing nixpkgs packages - uv2nix](#installing-nixpkgs-packages-uv2nix)
- [Flake Templates - Pyproject.nix](#flake-templates-pyproject-nix)
- [FAQ - Pyproject.nix](#faq-pyproject-nix)
- [User facing APIs - Pyproject.nix](#user-facing-apis-pyproject-nix)
- [Building wheels/sdists - uv2nix](#building-wheels-sdists-uv2nix)
- [workspace - uv2nix](#workspace-uv2nix)
- [lock1 - uv2nix](#lock1-uv2nix)
- [overlays - uv2nix](#overlays-uv2nix)
- [scripts - Pyproject.nix](#scripts-pyproject-nix)
- [nixpkgs - Pyproject.nix](#nixpkgs-pyproject-nix)
- [Hacking - uv2nix](#hacking-uv2nix)
- [Standards APIs - Pyproject.nix](#standards-apis-pyproject-nix)
- [pep599 - Pyproject.nix](#pep599-pyproject-nix)
- [Support - uv2nix](#support-uv2nix)
- [pep600 - Pyproject.nix](#pep600-pyproject-nix)
- [pep656 - Pyproject.nix](#pep656-pyproject-nix)
- [poetry - Pyproject.nix](#poetry-pyproject-nix)
- [pep621 - Pyproject.nix](#pep621-pyproject-nix)
- [eggs - Pyproject.nix](#eggs-pyproject-nix)
- [pypa - Pyproject.nix](#pypa-pyproject-nix)
- [pip - Pyproject.nix](#pip-pyproject-nix)
- [lib - Pyproject.nix](#lib-pyproject-nix)
- [renderers - Pyproject.nix](#renderers-pyproject-nix)
- [resolvers - Pyproject.nix](#resolvers-pyproject-nix)
- [packages - Pyproject.nix](#packages-pyproject-nix)
- [packages.hooks - Pyproject.nix](#packages-hooks-pyproject-nix)
- [util - Pyproject.nix](#util-pyproject-nix)
- [Hacking - Pyproject.nix](#hacking-pyproject-nix)
- [Support - Pyproject.nix](#support-pyproject-nix)
- [pep723 - Pyproject.nix](#pep723-pyproject-nix)
- [query - Pyproject.nix](#query-pyproject-nix)
- [Page not found - Pyproject.nix](#page-not-found-pyproject-nix)

---

# Introduction - Pyproject.nix

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Pyproject.nix
=============

[](https://pyproject-nix.github.io/print.html "Print this book")
[](https://github.com/pyproject-nix/pyproject.nix "Git repository")

Pyproject.nix is a collection of Nix utilities to work with Python project metadata in [Nix](https://nixos.org/)
. It mainly targets [PEP-621](https://peps.python.org/pep-0621/)
 compliant `pyproject.toml` files and data formats, but also implement support for other & legacy formats such as [Poetry](https://python-poetry.org/)
 & `requirements.txt`.

Pyproject.nix aims to be a swiss army knife of simple customizable utilities that works either together with the [nixpkgs Python infrastructure](https://nixos.org/manual/nixpkgs/stable/#python)
, or [our own build infrastructure](https://pyproject-nix.github.io/build.html)
.

This documentation only helps you to get started with `pyproject.nix`. As it's a toolkit with many use cases not every use case can be documented fully.

First and foremost `pyproject.nix` is a _Python metadata toolkit_, and not a 2nix tool.

This documentation is centered around packaging Python applications & managing development environments. For other use cases see the reference documentation.

`pyproject.nix` introduces a few high level abstract concepts. The best way to get started is to understand these concepts and how they fit together.

### [Project](https://pyproject-nix.github.io/lib/project.html)

A `project` attribute set is a high-level representation of a project that includes:

*   The parsed `pyproject.toml` file
*   Parsed dependencies
*   Project root directory

It can can be loaded from many different sources:

*   PEP-621 `pyproject.toml`
*   PEP-621 `pyproject.toml` with PDM extensions
*   Poetry `pyproject.toml`
*   `requirements.txt`

### [Validators](https://pyproject-nix.github.io/lib/validators.html)

Validators work on dependency constraints as defined in a `project` and offers validation for them. This can be useful to check that a package set is compliant with the specification.

### [Renderers](https://pyproject-nix.github.io/lib/renderers.html)

A `renderer` takes a `project` together with a Python interpreter derivation and renders it into a form understood by various pieces of Python infrastructure.

For example: The `buildPythonPackage` renderer returns an attribute set that can be passed to either nixpkgs function `buildPythonPackage` or `buildPythonApplication`.

There might be information missing from what a renderer returned depending on what can be computed from the `project`. If any attributes are missing you can manually merge your own attribute set with what the renderer returned.

For a concrete example use see [Use cases -> pyproject.toml](https://pyproject-nix.github.io/use-cases/pyproject.html)
.

---

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---

# Page not found · GitHub Pages

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===

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---

# Page not found · GitHub Pages

404
===

**File not found**

The site configured at this address does not contain the requested file.

If this is your site, make sure that the filename case matches the URL as well as any file permissions.  
For root URLs (like `http://example.com/`) you must provide an `index.html` file.

[Read the full documentation](https://help.github.com/pages/)
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[GitHub Status](https://githubstatus.com/)
 — [@githubstatus](https://twitter.com/githubstatus)

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---

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---

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---

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---

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---

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---

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---

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---

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---

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---

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---

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---

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---

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---

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---

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---

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---

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---

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---

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---

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---

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---

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---

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---

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---

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---

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---

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---

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---

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---

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---

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---

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---

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---

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---

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---

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---

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---

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---

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 [![](data:image/png;base64,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)](https://pyproject-nix.github.io/)
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---

# Unknown

Pyproject.nix project documentation
===================================

*   [pyproject.nix](https://pyproject-nix.github.io/pyproject.nix/)
    
*   [uv2nix](https://pyproject-nix.github.io/uv2nix/)

---

# Introduction - uv2nix

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uv2nix
======

[](https://pyproject-nix.github.io/uv2nix/print.html "Print this book")
[](https://github.com/pyproject-nix/uv2nix "Git repository")

`uv2nix` takes a [`uv`](https://docs.astral.sh/uv/)
 [workspace](https://docs.astral.sh/uv/concepts/workspaces/)
 and generates Nix derivations dynamically using pure Nix code. It's designed to be used both as a development environment manager, and to build production packages for projects.

It is heavily based on [`pyproject.nix`](https://pyproject-nix.github.io/pyproject.nix)
 and its [build infrastructure](https://pyproject-nix.github.io/pyproject.nix/build.html)
.

---

# Installation - uv2nix

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uv2nix
======

[](https://pyproject-nix.github.io/uv2nix/print.html "Print this book")
[](https://github.com/pyproject-nix/uv2nix "Git repository")

Documentation examples in `uv2nix` are using Flakes for the convenience of grouping multiple concepts into a single file.

You can just as easily import `uv2nix` without using Flakes:

    let
      pkgs = import <nixpkgs> { };
      inherit (pkgs) lib;
    
      pyproject-nix = import (builtins.fetchGit {
        url = "https://github.com/pyproject-nix/pyproject.nix.git";
      }) {
        inherit lib;
      };
    
      uv2nix = import (builtins.fetchGit {
        url = "https://github.com/pyproject-nix/uv2nix.git";
      }) {
        inherit pyproject-nix lib;
      };
    
      pyproject-build-systems = import (builtins.fetchGit {
        url = "https://github.com/pyproject-nix/build-system-pkgs.git";
      }) {
        inherit pyproject-nix uv2nix lib;
      };
    
    in
      ...
    

See [usage/hello-world](https://pyproject-nix.github.io/uv2nix/usage/hello-world.html)
.

---

# Builders - Pyproject.nix

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Pyproject.nix
=============

[](https://pyproject-nix.github.io/pyproject.nix/print.html "Print this book")
[](https://github.com/pyproject-nix/pyproject.nix "Git repository")

The pyproject.nix build infrastructure is mainly targeted at python2nix authors, and is being used in uv2nix.

Pyproject.nix can be used with nixpkgs `buildPythonPackage`/`packageOverrides`/`withPackages`, but also implements its own build infrastructure that fixes many structural problems with the nixpkgs implementation.

Nixpkgs Python infrastructure relies on [dependency propagation](https://nixos.org/manual/nixpkgs/unstable/#ssec-stdenv-dependencies-propagated)
. The propagation mechanism works through making dependencies available to the builder at build-time, and recording their Nix store paths in `$out/nix-support/propagated-build-inputs`. [Setup hooks](https://nixos.org/manual/nixpkgs/unstable/#ssec-setup-hooks)
 are then used to add these packages to `$PYTHONPATH` for discovery by the Python interpreter which adds everything from `$PYTHONPATH` to `sys.path` at startup.

Propagation causes several issues downstream.

Consider the following development shell using nixpkgs Python builders:

    let
      pkgs = import <nixpkgs> { };
      pythonEnv = pkgs.python3.withPackages(ps: [ ps.requests ]);
    in pkgs.mkShell {
      packages = [\
        pkgs.remarshal\
        pythonEnv\
      ];
    }
    

Any Python package, such as `remarshal`, will have their dependencies leaking into `$PYTHONPATH`, making undeclared dependencies available to the Python interpreter. Making matters even worse: Any dependency on `$PYTHONPATH` takes precedence over virtualenv installed dependencies!

Nix dependency graphs are required to be a [DAG](https://en.wikipedia.org/wiki/Directed_acyclic_graph)
, but Python dependencies can be cyclic. Dependency propagation is inherently incompatible with cyclic dependencies. In nixpkgs propagation issues are commonly worked around by patching packages in various ways.

Nixpkgs Python builders uses wrappers for Python executables in `bin/`, these set environment variables `NIX_PYTHONPATH` & friends These environment variables are picked up by the interpreter using a [sitecustomize.py](https://docs.python.org/3/library/site.html#module-sitecustomize)
 in the system `site-packages` directory.

Any Python programs executing another child Python interpreter using `sys.executable` will have it's modules lost on import, as `sys.executable` isn't pointing to the environment created by `withPackages`.

Because `buildPythonPackage` uses propagation runtime dependencies of a package are required to be present at build time.

In Python builds runtime dependencies are not actually required to be present. Making runtime dependencies available at build-time results in derivation hashes changing much more frequently than they have to.

The solution is to decouple the runtime dependency graph from the build time one, by putting runtime dependencies in [passthru](https://nixos.org/manual/nixpkgs/unstable/#chap-passthru)
:

    stdenv.mkDerivation {
      pname = "setuptools-scm";
      version = "8.1.0";
      src = fetchurl {
        url = "https://files.pythonhosted.org/packages/4f/a4/00a9ac1b555294710d4a68d2ce8dfdf39d72aa4d769a7395d05218d88a42/setuptools_scm-8.1.0.tar.gz";
        hash = "";
      };
    
      passthru = {
        dependencies = {
          packaging = [ ];
          setuptools = [ ];
        };
    
        optional-dependencies = {
          toml = { toml = [ ]; };
          rich = { rich = [ ]; };
        };
      };
    
      nativeBuildInputs = [\
        pyprojectHook\
      ] ++ resolveBuildSystem (
        {
          setuptools = [ ];
        }
      );
    }
    

Because runtime dependencies are not propagated every package needs to resolve the runtime dependencies of their build-system's.

Additionally packages can't simply be consumed, but must be aggregated into a virtual environment to be useful:

    { pyproject-nix, pkgs }:
    
    let
      python = pkgs.python312;
    
      # Inject your own packages on top with overrideScope
      pythonSet = pkgs.callPackage pyproject-nix.build.packages {
        inherit python;
      };
    
    in pythonSet.pythonPkgsHostHost.mkVirtualEnv "test-venv" {
      build = [ ];
    }
    

Cyclic dependencies are supported thanks to the resolver returning a flat list of required Python packages. For performance reasons two solvers are implemented:

*   One that does not support cyclic dependencies A much more performant resolver used by resolveBuildSystem and has all known build-systems memoized.
    
*   One that does support cyclic dependencies Used to resolve virtual environments
    

It's possible to override the resolver used entirely, so even though cyclic build-system's are not supported by default, it can be done with overrides.

As the runtime dependency graph is decoupled from the build time one derivation hashes change far less frequently.

An additional benefit is improved build scheduling: Because the dependency graph is much flatter than a `buildPythonPackage` based one derivations can be more efficiently scheduled in parallel.

Instead of binary wrappers & environment variables `pyproject.nix`'s builders use standard Python virtual environments.

---

# uv2nix

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uv2nix
======

[](https://pyproject-nix.github.io/uv2nix/print.html "Print this book")
[](https://github.com/pyproject-nix/uv2nix "Git repository")

`uv2nix` takes a [`uv`](https://docs.astral.sh/uv/)
 [workspace](https://docs.astral.sh/uv/concepts/workspaces/)
 and generates Nix derivations dynamically using pure Nix code. It's designed to be used both as a development environment manager, and to build production packages for projects.

It is heavily based on [`pyproject.nix`](https://pyproject-nix.github.io/pyproject.nix)
 and its [build infrastructure](https://pyproject-nix.github.io/pyproject.nix/build.html)
.

Documentation examples in `uv2nix` are using Flakes for the convenience of grouping multiple concepts into a single file.

You can just as easily import `uv2nix` without using Flakes:

    let
      pkgs = import <nixpkgs> { };
      inherit (pkgs) lib;
    
      pyproject-nix = import (builtins.fetchGit {
        url = "https://github.com/pyproject-nix/pyproject.nix.git";
      }) {
        inherit lib;
      };
    
      uv2nix = import (builtins.fetchGit {
        url = "https://github.com/pyproject-nix/uv2nix.git";
      }) {
        inherit pyproject-nix lib;
      };
    
      pyproject-build-systems = import (builtins.fetchGit {
        url = "https://github.com/pyproject-nix/build-system-pkgs.git";
      }) {
        inherit pyproject-nix uv2nix lib;
      };
    
    in
      ...
    

See [usage/hello-world](https://pyproject-nix.github.io/uv2nix/usage/hello-world.html)
.

Before going further and adopting uv2nix, first consider if you really want/need it. You don't need uv2nix to develop uv projects with Nix.

If you are not deploying your application with Nix it's likely that you don't want uv2nix and might be fine using the [`impure` template from `pyproject.nix`](https://pyproject-nix.github.io/pyproject.nix/templates.html#impure)
:

    nix flake init --template github:pyproject-nix/pyproject.nix#impure
    

It's also possible that you might want to develop your package(s) in an impure shell (as opposed to using editables with uv2nix, see development shell below), but deploy using uv2nix.

Any combination of approaches is possible, with different trade-offs for each.

This getting started guide is intended to be read alongside the `hello-world` [uv2nix template](https://pyproject-nix.github.io/uv2nix/templates.html)
:

    nix flake init --template github:pyproject-nix/uv2nix#hello-world
    

which contains much of the same code, but without elaboration or explanation of all the involved concepts.

Before anything can be done enter a development shell with required bootstrapping dependencies:

    nix-shell -p python3 uv
    

And then use uv to create a boilerplate `pyproject.toml` & a `uv.lock`:

    uv init --app --package
    uv lock
    

You can now start [adding dependencies](https://docs.astral.sh/uv/#projects)
 & more.

Uv2nix uses [`pyproject.nix` Python builders](https://pyproject-nix.github.io/pyproject.nix/build.html)
 which needs to be instantiated with a nixpkgs instance:

    pythonBase = pkgs.callPackage pyproject-nix.build.packages {
      inherit python;
    };
    

Creates the necessary structure & build hooks, but it doesn't contain any Python packages itself. In uv2nix all Python packages are generated from `uv.lock` & explicitly added through [overlays](https://nixos.org/manual/nixpkgs/unstable/#chap-overlays)
.

The top-level abstraction in uv2nix is the [_workspace_](https://docs.astral.sh/uv/concepts/projects/workspaces/)
, which needs to be loaded.

    workspace = uv2nix.lib.workspace.loadWorkspace { workspaceRoot = ./.; };
    

Will recursively discover, load & parse all necessary member projects in a uv workspace.

Uv2nix treats every project as a workspace project, even if it only contains a single `pyproject.toml` with a single project.

Takes `uv.lock` & creates an overlay for use with `pyproject.nix` builders.

    overlay = workspace.mkPyprojectOverlay {
      sourcePreference = "wheel";
    };
    

With `sourcePreference` you have a choice to make:

*   `wheel`

Prefer downloading packages as binary wheels.

*   `sdist`

Prefer building packages from source.

Binary wheels are much more likely to "just work" while sdists require manual [overrides](https://pyproject-nix.github.io/uv2nix/overriding/index.html)
 more often. Wheel/sdist selection can also be done on a per-package basis.

If you are experiencing uv2nix using an sdist where you expect it to use a wheel on MacOS you might need to set the appropriate [platform quirks](https://pyproject-nix.github.io/uv2nix/platform-quirks.html)
.

uv [doesn't lock build systems](https://github.com/astral-sh/uv/issues/5190)
 which are required when building packages from source. uv2nix doesn't try to hide this definiency, but instead has an [overlay with the most common ones provided](https://github.com/pyproject-nix/build-system-pkgs)
.

The build system overlay has the same sdist/wheel distinction as `mkPyprojectOverlay`:

*   `pyproject-build-systems.overlays.wheel`

Prefer build systems from binary wheels

*   `pyproject-build-systems.overlays.sdist`

Prefer build systems packages from source

Compose the Python base set + build systems + `uv.lock` generated packages into a concrete Python set:

    pythonSet = pythonBase.overrideScope (
      lib.composeManyExtensions [\
        pyproject-build-systems.overlays.wheel\
        overlay\
      ]
    );
    

This set contains all Python packages as individual attributes.

Uv2nix [builds packages individually](https://pyproject-nix.github.io/pyproject.nix/build.html#solution-presented-by-pyprojectnixs-builders)
, but they aren't really useful until they're aggregated into a virtual environment.

The most convienent way to build a virtualenv is to use one of the dependency presets:

    pythonSet.mkVirtualEnv "hello-world-env" workspace.deps.default
    

But it's also possible to specify which dependencies to install explicitly:

    pythonSet.mkVirtualEnv "hello-world-env" {
      # Install hello-world with no enabled extras
      hello-world = [ ];
    }
    

To ship package where the virtualenv is hidden see [shipping applications](https://pyproject-nix.github.io/uv2nix/patterns/applications.html)
.

When developing Python packages local packages are normally installed in [editable mode](https://setuptools.pypa.io/en/latest/userguide/development_mode.html)
. Editable packages make [entry points](https://packaging.python.org/en/latest/specifications/pyproject-toml/#entry-points)
 like `scripts` available in the virtual environment, but instead of installed Python files the virtualenv contains pointers to the source tree. This means that changes to the sources are immeditately activated and doesn't require a rebuild.

Uv2nix supports editable packages, but requires you to generate a separate overlay & package set for them:

    editableOverlay = workspace.mkEditablePyprojectOverlay {
      # Use environment variable pointing to editable root directory
      root = "$REPO_ROOT";
      # Optional: Only enable editable for these packages
      # members = [ "hello-world" ];
    };
    
    editablePythonSet = pythonSet.overrideScope editableOverlay;
    
    virtualenv = editablePythonSet.mkVirtualEnv "hello-world-dev-env" workspace.deps.all;
    

While not strictly required it's a good idea to apply [source filtering](https://pyproject-nix.github.io/uv2nix/patterns/source-filtering.html)
 to reduce how often editable packages need to be rebuilt.

The virtualenv can then be used with [`mkShell`](https://nixos.org/manual/nixpkgs/unstable/#sec-pkgs-mkShell)
:

    pkgs.mkShell {
      packages = [\
        virtualenv\
        pkgs.uv\
      ];
    
      env = {
        UV_NO_SYNC = "1";
        UV_PYTHON = editablePythonSet.python.interpreter;
        UV_PYTHON_DOWNLOADS = "never";
      };
    
      shellHook = ''
        unset PYTHONPATH
        export REPO_ROOT=$(git rev-parse --show-toplevel)
      '';
    }
    

The `env` attribute contains these settings:

*   `UV_NO_SYNC`
    
    Prevent uv from managing a virtual environment, this is managed by uv2nix.
    
*   `UV_PYTHON`
    
    Use interpreter path for all uv operations.
    
*   `UV_PYTHON_DOWNLOADS`
    
    Prevent uv from downloading [managed Python interpreters](https://docs.astral.sh/uv/#python-versions)
    , we use Nix instead.
    

The `shellHook` contains two interesting pieces:

*   Unsetting `PYTHONPATH`
    
    Unset to eliminate bad [side effects from Nixpkgs Python builders](https://pyproject-nix.github.io/pyproject.nix/build.html#pythonpath-leaking-into-unrelated-builds)
    .
    
*   Setting `REPO_ROOT`
    
    To inform the virtualenv which directory editable packages are relative to.
    

Some advanced build systems (like `meson-python`) are more involved & require [additional setup](https://pyproject-nix.github.io/uv2nix/patterns/advanced-build-systems.html)
.

For more detailed information on overriding, see [`pyproject.nix`](https://pyproject-nix.github.io/pyproject.nix/builders/overriding.html)
.

*   `overrides-sdist.nix`

    { pkgs }:
    final: prev: {
    
      pyzmq = prev.pyzmq.overrideAttrs (old: {
    
        # Use the zeromq library from nixpkgs.
        #
        # If not provided by the system pyzmq will build a zeromq library
        # as a part of it's package build, taking unnecessary time & effort.
        buildInputs = (old.buildInputs or [ ]) ++ [ pkgs.zeromq ];
    
        # uv.lock does not contain build-system metadata.
        # Meaning that for source builds, this needs to be provided by overriding.
        #
        # Pyproject.nix's build-system-pkgs contains some of the most
        # important build systems already, so you don't have to add these to your project.
        #
        # For a comprehensive list see
        # https://github.com/pyproject-nix/build-system-pkgs/blob/master/pyproject.toml
        #
        # For build-systems that are not present in this list you can either:
        # - Add it to your `uv` project
        # - Add it manually in an overlay
        # - Submit a PR to build-system-pkgs adding the build system
        nativeBuildInputs = old.nativeBuildInputs ++ [\
          (final.resolveBuildSystem {\
            cmake = [ ];\
            ninja = [ ];\
            packaging = [ ];\
            pathspec = [ ];\
            scikit-build-core = [ ];\
            cython = [ ];\
          })\
        ];
    
      });
    
    }
    

The proper solution for this would be for [`uv` to lock build systems](https://github.com/astral-sh/uv/issues/5190)
.

*   `overrides-wheels.nix`

    { pkgs }:
    _final: prev: {
    
      # Wheels are automatically patched using autoPatchelfHook.
      #
      # For manylinux wheels the appropriate packages are added
      # as described in https://peps.python.org/pep-0599/ and various other PEPs.
      #
      # Some packages provide binary libraries as a part of their binary wheels,
      # others expect libraries to be provided by the system.
      #
      # Numba depends on libtbb, of a more recent version than nixpkgs provides in it's default tbb attribute.
      numba = prev.numba.overrideAttrs (old: {
        buildInputs = (old.buildInputs or [ ]) ++ [ pkgs.tbb_2021_11 ];
      });
    
    }
    

Long term this situation could be improved by [PEP-725](https://peps.python.org/pep-0725/)
.

*   [`uv2nix` FAQ on overrides](https://pyproject-nix.github.io/uv2nix/FAQ.html#why-doesnt-uv2nix-come-with-overrides)
    
*   [`pyproject.nix` overriding docs](https://pyproject-nix.github.io/pyproject.nix/builders/overriding.html)
    .
    
*   [`pyproject.nix` override hacks](https://pyproject-nix.github.io/pyproject.nix/builders/hacks.html)
    .
    
    Override utility functions
    
*   [`uv2nix_hammer_overrides`](https://github.com/TyberiusPrime/uv2nix_hammer_overrides/)
    
    Third party overrides collection
    

Overriding many build systems manually can quickly become tiresome with repeated declarations of `nativeBuildInputs` & calls to `resolveBuildSystem` for every package.

This overlay shows one strategy to deal with many build system overrides in a declarative fashion.

    final: prev:
    let
      inherit (final) resolveBuildSystem;
      inherit (builtins) mapAttrs;
    
      # Build system dependencies specified in the shape expected by resolveBuildSystem
      # The empty lists below are lists of optional dependencies.
      #
      # A package `foo` with specification written as:
      # `setuptools-scm[toml]` in pyproject.toml would be written as
      # `foo.setuptools-scm = [ "toml" ]` in Nix
      buildSystemOverrides = {
        attrs = {
          hatchling = [ ];
          hatch-vcs = [ ];
          hatch-fancy-pypi-readme = [ ];
        };
        hatchling = {
          pathspec = [ ];
          pluggy = [ ];
          packaging = [ ];
          trove-classifiers = [ ];
        };
        pathspec = {
          flit-core = [ ];
        };
        pluggy = {
          setuptools = [ ];
        };
        trove-classifiers = {
          setuptools = [ ];
        };
        tomli.flit-core = [ ];
        coverage.setuptools = [ ];
        blinker.setuptools = [ ];
        certifi.setuptools = [ ];
        charset-normalizer.setuptools = [ ];
        idna.flit-core = [ ];
        urllib3 = {
          hatchling = [ ];
          hatch-vcs = [ ];
        };
        pip = {
          setuptools = [ ];
          wheel = [ ];
        };
        packaging.flit-core = [ ];
        requests.setuptools = [ ];
        pysocks.setuptools = [ ];
        pytest-cov.setuptools = [ ];
        tqdm.setuptools = [ ];
      };
    
    in
    mapAttrs (
      name: spec:
      prev.${name}.overrideAttrs (old: {
        nativeBuildInputs = old.nativeBuildInputs ++ resolveBuildSystem spec;
      })
    ) buildSystemOverrides
    

`uv2nix` uses the [`pyproject.nix` build infrastructure](https://pyproject-nix.github.io/pyproject.nix/build.html)
.

Unlike the nixpkgs, runtime & test dependencies are not available at build time. Tests should instead be implemented as separate derivations.

This usage pattern shows how to:

*   Overriding a package adding tests to `passthru.tests`
*   Using `passthru.tests` in Flake checks

    {
      description = "Pytest flake using uv2nix";
    
      inputs = {
        nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    
        pyproject-nix = {
          url = "github:pyproject-nix/pyproject.nix";
          inputs.nixpkgs.follows = "nixpkgs";
        };
    
        uv2nix = {
          url = "github:pyproject-nix/uv2nix";
          inputs.pyproject-nix.follows = "pyproject-nix";
          inputs.nixpkgs.follows = "nixpkgs";
        };
    
        pyproject-build-systems = {
          url = "github:pyproject-nix/build-system-pkgs";
          inputs.pyproject-nix.follows = "pyproject-nix";
          inputs.uv2nix.follows = "uv2nix";
          inputs.nixpkgs.follows = "nixpkgs";
        };
      };
    
      outputs =
        {
          nixpkgs,
          uv2nix,
          pyproject-nix,
          pyproject-build-systems,
          ...
        }:
        let
          inherit (nixpkgs) lib;
    
          forAllSystems = lib.genAttrs lib.systems.flakeExposed;
    
          workspace = uv2nix.lib.workspace.loadWorkspace { workspaceRoot = ./.; };
    
          overlay = workspace.mkPyprojectOverlay {
            sourcePreference = "wheel";
          };
    
          # Python sets grouped per system
          pythonSets = forAllSystems (
            system:
            let
              pkgs = nixpkgs.legacyPackages.${system};
              inherit (pkgs) stdenv;
    
              baseSet = pkgs.callPackage pyproject-nix.build.packages {
                python = pkgs.python312;
              };
    
              # An overlay of build fixups & test additions.
              pyprojectOverrides = final: prev: {
    
                # testing is the name of our example package
                testing = prev.testing.overrideAttrs (old: {
    
                  passthru = old.passthru // {
                    # Put all tests in the passthru.tests attribute set.
                    # Nixpkgs also uses the passthru.tests mechanism for ofborg test discovery.
                    #
                    # For usage with Flakes we will refer to the passthru.tests attributes to construct the flake checks attribute set.
                    tests =
                      let
                        # Construct a virtual environment with only the test dependency-group enabled for testing.
                        virtualenv = final.mkVirtualEnv "testing-pytest-env" {
                          testing = [ "test" ];
                        };
    
                      in
                      (old.tests or { })
                      // {
                        pytest = stdenv.mkDerivation {
                          name = "${final.testing.name}-pytest";
                          inherit (final.testing) src;
                          nativeBuildInputs = [\
                            virtualenv\
                          ];
                          dontConfigure = true;
    
                          # Because this package is running tests, and not actually building the main package
                          # the build phase is running the tests.
                          #
                          # In this particular example we also output a HTML coverage report, which is used as the build output.
                          buildPhase = ''
                            runHook preBuild
                            pytest --cov tests --cov-report html
                            runHook postBuild
                          '';
    
                          # Install the HTML coverage report into the build output.
                          #
                          # If you wanted to install multiple test output formats such as TAP outputs
                          # you could make this derivation a multiple-output derivation.
                          #
                          # See https://nixos.org/manual/nixpkgs/stable/#chap-multiple-output for more information on multiple outputs.
                          installPhase = ''
                            runHook preInstall
                            mv htmlcov $out
                            runHook postInstall
                          '';
                        };
    
                      };
                  };
                });
              };
    
            in
            baseSet.overrideScope (
              lib.composeManyExtensions [\
                pyproject-build-systems.overlays.default\
                overlay\
                pyprojectOverrides\
              ]
            )
          );
    
        in
        {
          # Construct flake checks from Python set
          checks = forAllSystems (
            system:
            let
              pythonSet = pythonSets.${system};
            in
            {
              inherit (pythonSet.testing.passthru.tests) pytest;
            }
          );
        };
    }
    

    [project]
    name = "testing"
    version = "0.1.0"
    description = "Add your description here"
    requires-python = ">=3.12"
    
    [project.scripts]
    hello = "testing:hello"
    
    [build-system]
    requires = ["hatchling"]
    build-backend = "hatchling.build"
    
    [dependency-groups]
    dev = [\
      "ruff>=0.7.2",\
      {include-group = "test"}\
    ]
    test = [\
      "pytest-cov>=6.0.0",\
      "pytest>=8.3.3",\
    ]
    

It's common to have development scripts that you don't want to publish in a Python package, but that you might want to run ergonomically from Nix.

This pattern shows how to:

*   Take a directory of development scripts (`examples/`)
*   Wrap the scripts in a virtualenv
*   Make scripts runnable using `nix run`

    {
      description = "Using Nix Flake apps to run scripts with uv2nix";
    
      inputs = {
        nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    
        pyproject-nix = {
          url = "github:pyproject-nix/pyproject.nix";
          inputs.nixpkgs.follows = "nixpkgs";
        };
    
        uv2nix = {
          url = "github:pyproject-nix/uv2nix";
          inputs.pyproject-nix.follows = "pyproject-nix";
          inputs.nixpkgs.follows = "nixpkgs";
        };
    
        pyproject-build-systems = {
          url = "github:pyproject-nix/build-system-pkgs";
          inputs.pyproject-nix.follows = "pyproject-nix";
          inputs.uv2nix.follows = "uv2nix";
          inputs.nixpkgs.follows = "nixpkgs";
        };
      };
    
      outputs =
        {
          nixpkgs,
          uv2nix,
          pyproject-nix,
          pyproject-build-systems,
          ...
        }:
        let
          inherit (nixpkgs) lib;
          inherit (lib) filterAttrs hasSuffix;
    
          workspace = uv2nix.lib.workspace.loadWorkspace { workspaceRoot = ./.; };
    
          overlay = workspace.mkPyprojectOverlay {
            sourcePreference = "wheel"; # or sourcePreference = "sdist";
          };
    
          pkgs = nixpkgs.legacyPackages.x86_64-linux;
    
          python = pkgs.python312;
    
          pythonSet =
            (pkgs.callPackage pyproject-nix.build.packages {
              inherit python;
            }).overrideScope
              (
                lib.composeManyExtensions [\
                  pyproject-build-systems.overlays.default\
                  overlay\
                ]
              );
    
          venv = pythonSet.mkVirtualEnv "development-scripts-default-env" workspace.deps.default;
        in
        {
    
          apps.x86_64-linux =
            let
              # Example base directory
              basedir = ./examples;
    
              # Get a list of regular Python files in example directory
              files = filterAttrs (name: type: type == "regular" && hasSuffix ".py" name) (
                builtins.readDir basedir
              );
    
            in
            # Map over files to:
            # - Rewrite script shebangs as shebangs pointing to the virtualenv
            # - Strip .py suffixes from attribute names
            #   Making a script "greet.py" runnable as "nix run .#greet"
            lib.mapAttrs' (
              name: _:
              lib.nameValuePair (lib.removeSuffix ".py" name) (
                let
                  script = basedir + "/${name}";
    
                  # Patch script shebang
                  program = pkgs.runCommand name { buildInputs = [ venv ]; } ''
                    cp ${script} $out
                    chmod +x $out
                    patchShebangs $out
                  '';
                in
                {
                  type = "app";
                  program = "${program}";
                }
              )
            ) files;
    
        };
    }
    

`uv2nix` primarily builds [_virtual environments_](https://docs.python.org/3/library/venv.html)
, not individual applications.

Virtual environment derivations have no concept of what their "main" binary is, meaning that a call like `lib.getExe` or a command like `nix run` won't know what is considered the main program.

To supplement `meta` fields in virtualenv derivations add an override:

    {
        # Expose Python virtual environments as packages.
        packages = forAllSystems (
          system:
          let
            pythonSet = pythonSets.${system};
    
            # Add metadata attributes to the virtual environment.
            # This is useful to inject meta and other attributes onto the virtual environment derivation.
            #
            # See
            # - https://nixos.org/manual/nixpkgs/unstable/#chap-passthru
            # - https://nixos.org/manual/nixpkgs/unstable/#chap-meta
            addMeta =
              drv:
              drv.overrideAttrs (old: {
                # Pass through tests from our package into the virtualenv so they can be discovered externally.
                passthru = lib.recursiveUpdate (old.passthru or { }) {
                  inherit (pythonSet.testing.passthru) tests;
                };
    
                # Set meta.mainProgram for commands like `nix run`.
                # https://nixos.org/manual/nixpkgs/stable/#var-meta-mainProgram
                meta = (old.meta or { }) // {
                  mainProgram = "hello";
                };
              });
    
          in
          {
            default = addMeta (pythonSet.mkVirtualEnv "testing-env" workspace.deps.default);
            full = addMeta (pythonSet.mkVirtualEnv "testing-env-full" workspace.deps.all);
          }
    }
    

`uv2nix` primarily builds [_virtual environments_](https://docs.python.org/3/library/venv.html)
, not individual applications.

Sometimes the fact that an application is written in Python & using a virtualenv is an implementation detail that you don't want to expose in your Nix package.

For such cases `pyproject.nix` provides a utility function [`mkApplication`](https://pyproject-nix.github.io/pyproject.nix/build/util.html#function-library-build.util.mkApplication)
:

    {
        packages = forAllSystems (
          system:
          let
            pythonSet = pythonSets.${system};
            pkgs = nixpkgs.legacyPackages.${system};
            inherit (pkgs.callPackages pyproject-nix.build.util { }) mkApplication;
          in
          {
            # Create a derivation that wraps the venv but that only links package
            # content present in pythonSet.hello-world.
            #
            # This means that files such as:
            # - Python interpreters
            # - Activation scripts
            # - pyvenv.cfg
            #
            # Are excluded but things like binaries, man pages, systemd units etc are included.
            default = mkApplication {
              venv = pythonSet.mkVirtualEnv "application-env" workspace.deps.default;
              package = pythonSet.hello-world;
          };
    }
    

When cross compiling build systems needs to be overriden _twice_. Once for the _build host_ and once for the _target host_

    let
      pyprojectOverrides = final: prev: {
        hatchling = prev.hatchling.overrideAttrs (old: {
          nativeBuildInputs =
            old.nativeBuildInputs
            ++ final.resolveBuildSystem {
              pathspec = [ ];
            };
        });
      };
    
    in
    pythonSet.overrideScope (
      lib.composeExtensions (_final: prev: {
        pythonPkgsBuildHost = prev.pythonPkgsBuildHost.overrideScope pyprojectOverrides;
      }) pyprojectOverrides
    )
    

    final: prev: {
    
      foobar = prev.foobar.overrideAttrs (old: {
        nativeBuildInputs = old.nativeBuildInputs ++ [\
          final.pkgs.buildPackages.cmake\
        ];
    
        buildInputs = (old.buildInputs or [ ]) ++ [ final.pkgs.ncurses ];
      });
    
    }
    

As a part of building a Python package `uv2nix` builds a wheel which is installed into the Nix store. The intermediate wheel file is normally discarded once the build is complete and the wheel has been installed into it's Nix store prefix.

Using [multiple outputs](https://nixos.org/manual/nixpkgs/stable/#chap-multiple-output)
 allows us to not only perform our regular install steps, but also to install the wheel files into a separate output. To add a separate dist output:

    pythonSet.hello-world.override (old: {
      outputs = [ "out" dist" ];
    })
    

This will install the produced wheel into the build output directory of the `dist` output, producing the same contents as a `uv build` would produce in `dist/`.

To augment the install behaviour to install the produced wheel into the Nix store output by overriding our package:

    pythonSet.hello-world.override {
      pyprojectHook = pythonSet.pyprojectDistHook;
    }
    

This will install the produced wheel into the build output directory, producing the same contents as a `uv build` would produce in `dist/`. Note that this method will not perform the regular `pyproject.nix` install steps, making the output unsuitable for usage with `mkVirtualEnv`.

Because of the risk of Nix store path references ending up in the wheel file via references to shared libraries & other Nix/nixpkgs specific behaviour the outputs are scanned for Nix store path references, and the build will fail if any are found.

By default `pyproject.nix`'s builders will produce a wheel.

If you want to distribute an sdist instead override `uvBuildType`:

    (pythonSet.hello-world.override {
      pyprojectHook = pythonSet.pyprojectDistHook;
    }).overrideAttrs(old: {
      env.uvBuildType = "sdist";
    })
    

In some cases a package isn't published on PyPI, but is packaged in nixpkgs, or you might be struggling trying to figure out the overrides to build a particular package. In such cases it's possible to use Python packages from nixpkgs through an interoperability layer.

We are using the `seccomp` package for demonstration here, which is not available on PyPI.

By using [`UV_FIND_LINKS`](https://docs.astral.sh/uv/configuration/environment/#uv_find_links)
 and a `shellHook` we can install the nixpkgs built wheel, making it possible to use both impure (uv managed) workflows & pure uv2nix managed workflows.

    let
      python = pkgs.python3;
    
      uv-links = pkgs.symlinkJoin {
        name = "uv-links";
        paths = [\
          # Note: Using the dist output which contains a wheel\
          python.pkgs.seccomp.dist\
        ];
      };
    
    in
    mkShell {
      packages = [ pkgs.uv python ];
      shellHook = ''
        ln -sfn ${uv-links} .uv-links
        export UV_FIND_LINKS=$(realpath -s .uv-links)
      '';
    }
    

To be able to read the sources from a Flake evaluation you will also have to override the `seccomp` package sources, as `.uv-links` is not added to Git.

    let
      pyprojectOverrides = final: prev: {
        seccomp = prev.seccomp.overrideAttrs(old: {
          buildInputs = (old.buildInputs or []) ++ python.pkgs.seccomp.buildInputs;
          src = python.pkgs.seccomp.dist;
        });
      };
    in ...
    

[pyproject.nix hacks](https://pyproject-nix.github.io/pyproject.nix/builders/hacks.html#using-prebuilt-packages-from-nixpkgs)

------------------------------------------------------------------------------------------------------------------------------

It's also possible to skip making uv aware of the package and only add the nixpkgs package from a Nix evaluation.

    let
      pyprojectOverrides = final: prev: {
        seccomp = hacks.nixpkgsPrebuilt {
          from = python.pkgs.seccomp;
        };
      };
    
      pythonSet' = pythonSet.overrideScope pyprojectOverrides;
    in
      pythonSet.mkVirtualEnv "seccomp-env" {
        seccomp = [ ];
      }
    

Uv2nix uses [pkgs.fetchurl](https://nixos.org/manual/nixpkgs/stable/#sec-pkgs-fetchers-fetchurl)
 for fetching from PyPI, and inherits authentication support from nixpkgs.

Getting authentication running in the sandbox requires some system setup.

    [project]
    name = "with-private-deps"
    version = "0.1.0"
    requires-python = ">=3.12"
    dependencies = ["iniconfig"]
    
    [[tool.uv.index]]
    name = "my-index"
    url = "https://pypi-proxy.fly.dev/basic-auth/simple"
    explicit = true
    
    [tool.uv.sources]
    iniconfig = { index = "my-index" }
    
    [build-system]
    requires = ["setuptools>=42"]
    build-backend = "setuptools.build_meta"
    

[netrc](https://everything.curl.dev/usingcurl/netrc.html)
 file
---------------------------------------------------------------

In this documentation we assume that the netrc file is saved as `/etc/nix/netrc`.

    machine pypi-proxy.fly.dev
    login public
    password heron
    

To use this netrc file inside our development shell run:

`$ export NETRC=/etc/nix/netrc`

While `pkgs.fetchurl` can use a netrc file, it won't do so by default. We'll need to override our authenticated package's `src` attribute to use our provided file.

    let
      pyprojectOverrides = _final: prev: {
        iniconfig = prev.iniconfig.overrideAttrs(old: {
          src = old.src.overrideAttrs(_: {
            # Make curl use our netrc file.
            curlOpts = "--netrc-file /etc/nix/netrc";
            # By default pkgs.fetchurl will fetch _without_ TLS verification for reproducibility.
            # Since we are transferring credentials we want to verify certificates.
            SSL_CERT_FILE = "${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt";
          });
        });
      };
    in ...
    

To build a package we need to provide our netrc file _inside_ the Nix sandbox.

`nix build -L -v --option extra-sandbox-paths /etc/nix/netrc`

For a persistent setup `extra-sandbox-paths` should be added to `nix.conf`.

With uv2nix, you can apply patches to your Python dependencies.

Use this superpower judiciously: if you're building a Python library, you probably don't want to apply patches to your dependencies that users of your library would also somehow have to apply.

This overlay applies a patch to the `arpeggio` library.

`arpeggio.patch`:

    --- /dev/null
    +++ b/arpeggio/patched.py
    @@ -0,0 +1 @@
    +print("You have patched arpeggio. Congratulations!")
    

Note how the overlay forces us to build from sdist, which requires specifying the build system. See [Overriding build systems](https://pyproject-nix.github.io/uv2nix/patterns/overriding-build-systems.html)
 for more details.

    final: prev: {
      arpeggio =
        (prev.arpeggio.override {
          # We build from sdist (not a wheel) to apply a patch to the source
          # code.
          # Alternatively, if you're using a wheel, you could apply patches to the
          # Python code in `postInstall`/`postFixup`, but YMMV.
          sourcePreference = "sdist";
        }).overrideAttrs
          (old: {
            patches = (old.patches or [ ]) ++ [\
              ./arpeggio.patch\
            ];
    
            nativeBuildInputs = old.nativeBuildInputs ++ [\
              (final.resolveBuildSystem {\
                setuptools = [ ];\
              })\
            ];
          });
    }
    

When using more advanced build systems, such as `cython` which builds native dependencies, or `meson-python` which relies on import hooks to dynamically perform recompilation on import an additional step needs to be taken to bridge the gap between the sandboxed Nix build and the source tree:

    pkgs.mkShell {
      packages = [\
        virtualenv\
        pkgs.uv\
    \
        # Add build-editable package from pyproject.nix\
        pyproject-nix.packages.${system}.build-editable\
      ];
    
      env = {
        UV_NO_SYNC = "1";
        UV_PYTHON = python.interpreter;
        UV_PYTHON_DOWNLOADS = "never";
      };
    
      shellHook = ''
        unset PYTHONPATH
        export REPO_ROOT=$(git rev-parse --show-toplevel)
    
        # Re-run editable package build for side effects
        build-editable
      '';
    };
    

Whenever you want to perform a build invoke `build-editable` which will in turn invoke your build system and write side effects such as `.so`'s in-place in your source tree. For most (all?) pure-Python build systems this is not relevant.

Nix has functionality to apply filtering to local sources when copying to the store. This allows users to tune how often a package is rebuilt by controlling what sources affect the Nix store path hashing.

Source selection/filtering is extra important for editable packages, which should ideally only be rebuilt when project metadata changes.

Most Python build backends only require enough sources to discover what importable Python packages to provide for an editable build to succeed:

        app = prev.app.overrideAttrs (old: {
          src = lib.fileset.toSource rec {
            root = ./.;
            fileset = lib.fileset.unions [\
              (root + "/pyproject.toml")\
              (root + "/app/__init__.py")\
            ];
          };
        });
    

This example uses the [fileset](https://nix.dev/tutorials/working-with-local-files.html)
 API to explicitly select sources.

Another way to reduce the amount of rebuilds even further is to construct dummy sources:

      app = prev.app.overrideAttrs(old: {
        src = pkgs.runCommand "app-src" {} ''
          cp ${./pyproject.toml} pyproject.toml
          mkdir app
          touch app/__init__.py
        '';
      });
    

*   [builtins.filterSource](https://nix.dev/manual/nix/latest/language/builtins#builtins-filterSource)
    
*   [lib.cleanSource](https://nixos.org/manual/nixpkgs/stable/#function-library-lib.sources.cleanSource)
    
*   [Working with local files (fileset)](https://nix.dev/tutorials/working-with-local-files.html)
    

`pyproject.nix` tries to set reasonable platform defaults when evaluating [PEP-508](https://pyproject-nix.github.io/pyproject.nix/lib/pep508.html)
 markers & checking wheel compatibility. There is platform metadata which is important to the Python dependency graph which may have to be overriden or supplemented from the inferred defaults.

For example Nixpkgs doesn't know which version of MacOS you're actually using. It only has information about what minimum SDK versions it supports & there is no way for Nix code to know which MacOS version you intend to target.

To override the MacOS SDK version used for marker evaluation & wheel compatibility checks override `darwinSdkVersion` in `stdenv.targetPlatform` in the original package set creation call:

    pkgs.callPackage pyproject-nix.build.packages {
      inherit python;
      stdenv = pkgs.stdenv.override {
        targetPlatform = pkgs.stdenv.targetPlatform // {
          # Sets MacOS SDK version to 15.1 which implies Darwin version 24.
          # See https://en.wikipedia.org/wiki/MacOS_version_history#Releases for more background on version numbers.
          darwinSdkVersion = "15.1";
        };
      };
    }
    

Nixpkgs also doesn't know which Linux kernel you're actually targetting, but makes a reasonable guess from the `linuxHeaders` package. To override the Linux kernel version used for marker evaluation in the call to `mkPyprojectOverlay`:

    let
      overlay = workspace.mkPyprojectOverlay {
        sourcePreference = "wheel";
        environ = {
          platform_release = "5.10.65";
        };
      }
    in ...
    

Uv supports [locking dependencies](https://docs.astral.sh/uv/guides/scripts/#locking-dependencies)
 for [inline metadata](https://packaging.python.org/en/latest/specifications/inline-script-metadata/#inline-script-metadata)
 scripts.

This example shows you how to set up a `uv2nix` from a directory of locked scripts.

It has the following features:

*   Creating one Python package set per script from `${script}.py.lock`
    
*   Build each script with `nix build .#script`
    
*   Run each script with `nix run .#script`
    

    {
      description = "Use PEP-723 inline metadata scripts with uv2nix";
    
      inputs = {
        nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    
        pyproject-nix = {
          url = "github:pyproject-nix/pyproject.nix";
          inputs.nixpkgs.follows = "nixpkgs";
        };
    
        uv2nix = {
          url = "github:pyproject-nix/uv2nix";
          inputs.pyproject-nix.follows = "pyproject-nix";
          inputs.nixpkgs.follows = "nixpkgs";
        };
    
        pyproject-build-systems = {
          url = "github:pyproject-nix/build-system-pkgs";
          inputs.pyproject-nix.follows = "pyproject-nix";
          inputs.uv2nix.follows = "uv2nix";
          inputs.nixpkgs.follows = "nixpkgs";
        };
      };
    
      outputs =
        {
          self,
          nixpkgs,
          uv2nix,
          pyproject-nix,
          pyproject-build-systems,
          ...
        }:
        let
          inherit (nixpkgs) lib;
          forAllSystems = lib.genAttrs lib.systems.flakeExposed;
    
          # Load all Python scripts from ./scripts directory
          scripts =
            lib.mapAttrs
              (
                name: _:
                uv2nix.lib.scripts.loadScript {
                  script = ./scripts + "/${name}";
                }
              )
              (
                lib.filterAttrs (name: type: type == "regular" && lib.hasSuffix ".py" name) (
                  builtins.readDir ./scripts
                )
              );
    
          packages' = forAllSystems (
            system:
            let
              pkgs = nixpkgs.legacyPackages.${system};
              python = pkgs.python3;
              baseSet = pkgs.callPackage pyproject-nix.build.packages {
                inherit python;
              };
            in
            lib.mapAttrs (
              _name: script:
              let
                # Create package overlay from script
                overlay = script.mkOverlay {
                  sourcePreference = "wheel";
                };
    
                # Construct package set
                pythonSet = baseSet.overrideScope (
                  lib.composeManyExtensions [\
                    pyproject-build-systems.overlays.wheel\
                    overlay\
                  ]
                );
              in
              # Write out an executable script with a shebang pointing to the scripts virtualenv
              pkgs.writeScript script.name (
                # Returns script as a string with inserted shebang
                script.renderScript {
                  # Construct a virtual environment for script
                  venv = script.mkVirtualEnv {
                    inherit pythonSet;
                  };
                }
              )
            ) scripts
          );
    
        in
        {
          # Drop .py suffix from scripts, making example.py runnable as example
          packages = forAllSystems (
            system:
            lib.mapAttrs' (name: drv: lib.nameValuePair (lib.removeSuffix ".py" name) drv) packages'.${system}
          );
    
          # Make each script runnable directly with `nix run`
          apps = forAllSystems (
            system:
            lib.mapAttrs (_name: script: {
              type = "app";
              program = "${script}";
            }) self.packages.${system}
          );
        };
    }
    

    # /// script
    # requires-python = ">=3.12"
    # dependencies = [\
    #   "tqdm",\
    # ]
    # ///
    
    from tqdm import tqdm
    
    for i in tqdm(range(10000)):
        pass
    

Uv exposes internally generated package markers(1), therefore uv2nix support for conflicts is limited and may have incorrect marker(2) evaluation results.

Uv has support for creating mutually exclusive groups of [conflicting dependencies](https://docs.astral.sh/uv/concepts/projects/config/#conflicting-dependencies)
.

To use conflicting dependencies with uv2nix you have to tell it which conflict resolution to take when creating the package overlay:

    workspace.mkPyprojectOverlay {
      sourcePreference = "wheel";
      dependencies = {
        hello-world = [ "extra1" ];
      };
    }
    

1.  [Uv pull request #4339](https://github.com/astral-sh/uv/pull/4339)
    
2.  [PEP-508 environment markers](https://packaging.python.org/en/latest/specifications/dependency-specifiers/#environment-markers)
    

A minimal example using uv2nix for both development & packaging.

    nix flake init --template github:pyproject-nix/uv2nix#hello-world
    

Building on on the `hello-world` template, adding a dependency on the [tkinter](https://docs.python.org/3/library/tkinter.html)
 graphics library.

Tkinter is normally shipped with Python and not published on PyPI. For closure size reasons nixpkgs splits out `tkinter` to it's own separate package in the nixpkgs Python package set.

    nix flake init --template github:pyproject-nix/uv2nix#hello-tkinter
    

Use uv2nix with locked [inline metadata scripts](https://docs.astral.sh/uv/#scripts)
.

    nix flake init --template github:pyproject-nix/uv2nix#inline-metadata
    

`uv2nix` can only work with what it has, and `uv.lock` metadata is notably absent of important metadata.

For more details see [overriding](https://pyproject-nix.github.io/uv2nix/overriding/index.html)
.

Users coming from [poetry2nix](https://github.com/nix-community/poetry2nix)
 may be surprised to find that uv2nix doesn't come with any bundled overrides.

Overrides are required because Python tooling is lacking important metadata, complexity which surfaces when using Nix. Uv2nix focuses on getting the translation from `pyproject.toml` & `uv.lock` to Nix right, without trying to taper over deficiencies in metadata.

In poetry2nix much of the requirement of overriding came from it's choice to build sdist's by default. uv2nix doesn't have a default package source preference, instead requiring users to make that choice. Binary wheels are much more likely to "just work", making it feasible to use uv2nix without an overrides collection at all. Maintaining overrides was the [biggest source of maintainer burnout for poetry2nix](https://github.com/nix-community/poetry2nix/issues/1865#issue-2640023203)
.

Users will either have to maintain their own set of overrides, or use a third-party override collection.

Load a workspace from a workspace root

`workspaceRoot`: Workspace root as a path

`config`: Config overrides for settings automatically inferred by `loadConfig`

Can be passed as either:

*   An attribute set
*   A function taking the generated config as an argument, and returning the augmented config

*   `mkPyprojectOverlay`: Create an overlay for usage with pyproject.nix's builders
*   `mkEditablePyprojectOverlay`: Generate an overlay to use with pyproject.nix's build infrastructure to install dependencies in editable mode.
*   `config`: Workspace config as loaded by `loadConfig`
*   `deps`: Pre-defined dependency declarations for top-level workspace packages
    *   `default`: No optional-dependencies or dependency-groups enabled
    *   `optionals`: All optional-dependencies enabled
    *   `groups`: All dependency-groups enabled
    *   `all`: All optional-dependencies & dependency-groups enabled

Load supported configuration from workspace

Supports:

*   tool.uv.no-binary
*   tool.uv.no-build
*   tool.uv.no-binary-package
*   tool.uv.no-build-package

Discover workspace member directories from a workspace root. Returns a list of strings relative to the workspace root.

structured function argument

: `workspaceRoot`

: Workspace root directory

`pyproject`

: Workspace top-level pyproject.toml

Resolve dependencies from uv.lock .

structured function argument

: `lock`

: Lock file as parsed by parseLock

`environ`

: PEP-508 environment as returned by pyproject-nix.lib.pep508.mkEnviron

`dependencies`

: List of dependency names to start resolution from

Check if a package is a local package. .

`package`

: Function argument

Get relative path for a local package .

`package`

: Function argument

Filter dependencies/optional-dependencies/dev-dependencies from a uv.lock package entry .

`environ`

: Function argument

Filter package conflicts from lock according to dependency specification.

This function exists to filter uv.lock _before_ being passed to resolveDependencies, allowing the runtime solver to treat the lock as if no conflicts exists.

structured function argument

: `lock`

: Function argument

`spec`

: Function argument

Parse unmarshaled uv.lock .

Parse a package entry from uv.lock .

Generate an overlay to use with pyproject.nix's build infrastructure.

See https://pyproject-nix.github.io/pyproject.nix/lib/build.html

structured function argument

: `sourcePreference`

: Whether to prefer sources from either: - wheel - sdist See FAQ for more information.

`environ`

: PEP-508 environment customisations. Example: { platform\_release = "5.10.65"; }

`spec`

: Dependency specification used for conflict resolution. By default mkPyprojectOverlay resolves the entire workspace, but that will not work for resolutions with conflicts.

`localProjects`

: Local projects loaded from lock1.loadLocalPackages

`config`

: Workspace config

`workspaceRoot`

: Workspace root

`lock`

: Lock parsed by lock1.parseLock

This document outlines hacking on `uv2nix` itself, and lays out it's project structure.

All Nix code lives in `lib/`. Each file has an implementation and a test suite. The attribute path to a an attribute `mkOverlay` in `lib/lock.nix` would be `lib.lock.mkOverlay`.

A function in `lib/test.nix` maps over the public interface of the library and the test suite to generate coverage tests, ensuring that every exported symbol has at least one test covering it.

Integration tests meaning tests that perform environment constructions & builds lives in `test/` and are exposed through Flake checks.

The manual you are reading right now is built from the `doc/` directory. To edit a specific page see the "Edit this page on GitHub" link in the footer for each respective page.

*   Run the entire unit test suite `$ nix-unit --flake .#libTests`
    
*   Run unit tests for an individual function \`$ nix-unit --flake .#libTests.lock.mkOverlay
    
*   Run integration tests `$ nix flake check`
    

Before submitting a PR format the code with `nix fmt` and ensure Flake checks pass with `nix flake check`.

Commercial support for the `pyproject.nix` ecosystem is offered by [Bladis Limited](https://blad.is/consulting/)
.

---

# Introduction - uv2nix

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uv2nix
======

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[](https://github.com/pyproject-nix/uv2nix "Git repository")

`uv2nix` takes a [`uv`](https://docs.astral.sh/uv/)
 [workspace](https://docs.astral.sh/uv/concepts/workspaces/)
 and generates Nix derivations dynamically using pure Nix code. It's designed to be used both as a development environment manager, and to build production packages for projects.

It is heavily based on [`pyproject.nix`](https://pyproject-nix.github.io/pyproject.nix)
 and its [build infrastructure](https://pyproject-nix.github.io/pyproject.nix/build.html)
.

---

# Source filtering - uv2nix

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Nix has functionality to apply filtering to local sources when copying to the store. This allows users to tune how often a package is rebuilt by controlling what sources affect the Nix store path hashing.

Source selection/filtering is extra important for editable packages, which should ideally only be rebuilt when project metadata changes.

Most Python build backends only require enough sources to discover what importable Python packages to provide for an editable build to succeed:

        app = prev.app.overrideAttrs (old: {
          src = lib.fileset.toSource rec {
            root = ./.;
            fileset = lib.fileset.unions [\
              (root + "/pyproject.toml")\
              (root + "/app/__init__.py")\
            ];
          };
        });
    

This example uses the [fileset](https://nix.dev/tutorials/working-with-local-files.html)
 API to explicitly select sources.

Another way to reduce the amount of rebuilds even further is to construct dummy sources:

      app = prev.app.overrideAttrs(old: {
        src = pkgs.runCommand "app-src" {} ''
          cp ${./pyproject.toml} pyproject.toml
          mkdir app
          touch app/__init__.py
        '';
      });
    

*   [builtins.filterSource](https://nix.dev/manual/nix/latest/language/builtins#builtins-filterSource)
    
*   [lib.cleanSource](https://nixos.org/manual/nixpkgs/stable/#function-library-lib.sources.cleanSource)
    
*   [Working with local files (fileset)](https://nix.dev/tutorials/working-with-local-files.html)

---

# Overriding - uv2nix

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For more detailed information on overriding, see [`pyproject.nix`](https://pyproject-nix.github.io/pyproject.nix/builders/overriding.html)
.

*   `overrides-sdist.nix`

    { pkgs }:
    final: prev: {
    
      pyzmq = prev.pyzmq.overrideAttrs (old: {
    
        # Use the zeromq library from nixpkgs.
        #
        # If not provided by the system pyzmq will build a zeromq library
        # as a part of it's package build, taking unnecessary time & effort.
        buildInputs = (old.buildInputs or [ ]) ++ [ pkgs.zeromq ];
    
        # uv.lock does not contain build-system metadata.
        # Meaning that for source builds, this needs to be provided by overriding.
        #
        # Pyproject.nix's build-system-pkgs contains some of the most
        # important build systems already, so you don't have to add these to your project.
        #
        # For a comprehensive list see
        # https://github.com/pyproject-nix/build-system-pkgs/blob/master/pyproject.toml
        #
        # For build-systems that are not present in this list you can either:
        # - Add it to your `uv` project
        # - Add it manually in an overlay
        # - Submit a PR to build-system-pkgs adding the build system
        nativeBuildInputs = old.nativeBuildInputs ++ [\
          (final.resolveBuildSystem {\
            cmake = [ ];\
            ninja = [ ];\
            packaging = [ ];\
            pathspec = [ ];\
            scikit-build-core = [ ];\
            cython = [ ];\
          })\
        ];
    
      });
    
    }
    

The proper solution for this would be for [`uv` to lock build systems](https://github.com/astral-sh/uv/issues/5190)
.

*   `overrides-wheels.nix`

    { pkgs }:
    _final: prev: {
    
      # Wheels are automatically patched using autoPatchelfHook.
      #
      # For manylinux wheels the appropriate packages are added
      # as described in https://peps.python.org/pep-0599/ and various other PEPs.
      #
      # Some packages provide binary libraries as a part of their binary wheels,
      # others expect libraries to be provided by the system.
      #
      # Numba depends on libtbb, of a more recent version than nixpkgs provides in it's default tbb attribute.
      numba = prev.numba.overrideAttrs (old: {
        buildInputs = (old.buildInputs or [ ]) ++ [ pkgs.tbb_2021_11 ];
      });
    
    }
    

Long term this situation could be improved by [PEP-725](https://peps.python.org/pep-0725/)
.

*   [`uv2nix` FAQ on overrides](https://pyproject-nix.github.io/uv2nix/FAQ.html#why-doesnt-uv2nix-come-with-overrides)
    
*   [`pyproject.nix` overriding docs](https://pyproject-nix.github.io/pyproject.nix/builders/overriding.html)
    .
    
*   [`pyproject.nix` override hacks](https://pyproject-nix.github.io/pyproject.nix/builders/hacks.html)
    .
    
    Override utility functions
    
*   [`uv2nix_hammer_overrides`](https://github.com/TyberiusPrime/uv2nix_hammer_overrides/)
    
    Third party overrides collection

---

# requirements.txt - Pyproject.nix

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Pyproject.nix
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[](https://github.com/pyproject-nix/pyproject.nix "Git repository")

Many projects comes without proper packaging and use [`requirements.txt`](https://pip.pypa.io/en/stable/reference/requirements-file-format/)
 files to declare their dependencies.

This example loads `requirements.txt` to create an environment using [`python.withPackages`](https://nixos.org/manual/nixpkgs/stable/#user-guide)
 with packages from nixpkgs.

    {
      description = "Construct development shell from requirements.txt";
    
      inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
    
      inputs.pyproject-nix.url = "github:pyproject-nix/pyproject.nix";
    
      outputs =
        { nixpkgs, pyproject-nix, ... }:
        let
          # Load/parse requirements.txt
          project = pyproject-nix.lib.project.loadRequirementsTxt { projectRoot = ./.; };
    
          pkgs = nixpkgs.legacyPackages.x86_64-linux;
          python = pkgs.python3;
    
          pythonEnv =
            # Assert that versions from nixpkgs matches what's described in requirements.txt
            # In projects that are overly strict about pinning it might be best to remove this assertion entirely.
            assert project.validators.validateVersionConstraints { inherit python; } == { };
            (
              # Render requirements.txt into a Python withPackages environment
              pkgs.python3.withPackages (project.renderers.withPackages { inherit python; })
            );
    
        in
        {
          devShells.x86_64-linux.default = pkgs.mkShell { packages = [ pythonEnv ]; };
        };
    }

---

# Platform quirks - uv2nix

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[](https://github.com/pyproject-nix/uv2nix "Git repository")

`pyproject.nix` tries to set reasonable platform defaults when evaluating [PEP-508](https://pyproject-nix.github.io/pyproject.nix/lib/pep508.html)
 markers & checking wheel compatibility. There is platform metadata which is important to the Python dependency graph which may have to be overriden or supplemented from the inferred defaults.

For example Nixpkgs doesn't know which version of MacOS you're actually using. It only has information about what minimum SDK versions it supports & there is no way for Nix code to know which MacOS version you intend to target.

To override the MacOS SDK version used for marker evaluation & wheel compatibility checks override `darwinSdkVersion` in `stdenv.targetPlatform` in the original package set creation call:

    pkgs.callPackage pyproject-nix.build.packages {
      inherit python;
      stdenv = pkgs.stdenv.override {
        targetPlatform = pkgs.stdenv.targetPlatform // {
          # Sets MacOS SDK version to 15.1 which implies Darwin version 24.
          # See https://en.wikipedia.org/wiki/MacOS_version_history#Releases for more background on version numbers.
          darwinSdkVersion = "15.1";
        };
      };
    }
    

Nixpkgs also doesn't know which Linux kernel you're actually targetting, but makes a reasonable guess from the `linuxHeaders` package. To override the Linux kernel version used for marker evaluation in the call to `mkPyprojectOverlay`:

    let
      overlay = workspace.mkPyprojectOverlay {
        sourcePreference = "wheel";
        environ = {
          platform_release = "5.10.65";
        };
      }
    in ...

---

# Usage - Pyproject.nix

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Pyproject.nix
=============

[](https://pyproject-nix.github.io/pyproject.nix/print.html "Print this book")
[](https://github.com/pyproject-nix/pyproject.nix "Git repository")

While the nixpkgs Python infrastructure is built mainly for manual packaging, `pyproject.nix`'s builders are mainly targeted at lock file consumers like [uv2nix](https://github.com/pyproject-nix/uv2nix)
.

This example shows the essence of implementing a lock file converter in pure Nix using `pyproject.nix`. A real world implementation is more complex. To see a lock file converter built according to `pyproject.nix` best practices see [uv2nix](https://github.com/pyproject-nix/uv2nix)
.

    {
      python,
      callPackage,
      pyproject-nix,
      lib,
    }:
    let
      # Pyproject.nix packages quite a few, but not all build-system dependencies.
      #
      # We only package PyPI packages because lock file generators often miss this metadata, so it's required to help kickstart a Python set.
      # This set is incomplete, and much smaller in both package count and scope than nixpkgs is.
      baseSet = callPackage pyproject-nix.build.packages {
        inherit python;
      };
    
      # A hypothetical over-simplified "lock file" format to demonstrate what typical usage would look like.
      # This format is absent of important data such as PEP-508 markers and more.
      #
      # Also note that all sources are the same. In a real-world file these would of course all be different.
      lock =
        let
          src = {
            type = "pypi";
            url = "https://files.pythonhosted.org/packages/63/70/2bf7780ad2d390a8d301ad0b550f1581eadbd9a20f896afe06353c2a2913/requests-2.32.3.tar.gz";
            hash = "sha256:55365417734eb18255590a9ff9eb97e9e1da868d4ccd6402399eaf68af20a760";
          };
        in
        {
          package-a = {
            name = "a";
            version = "1.0.0";
            dependencies = { };
            optional-dependencies = { };
            inherit src;
            build-system = {
              flit-core = [ ];
            };
          };
    
          package-b = {
            name = "b";
            version = "1.0.0";
            # Depend on a with no optionals
            dependencies = {
              a = [ ];
            };
            inherit src;
            build-system = {
              flit-core = [ ];
            };
          };
    
          package-c = {
            name = "c";
            version = "1.0.0";
            dependencies = {
              a = [ ];
            };
            # Has an optional dependency on b when cool_feature is activated
            optional-dependencies = {
              cool_feature = {
                b = [ ];
              };
            };
            inherit src;
            build-system = {
              flit-core = [ ];
            };
          };
    
          package-d = {
            name = "d";
            version = "1.0.0";
            dependencies = {
              c = [ "cool_feature" ];
            };
            # A local package dependend on by it's path
            src = {
              type = "path";
              path = ./packages/d;
            };
            build-system = {
              flit-core = [ ];
            };
          };
        };
    
      # Create a PEP-508 marker environment for marker evaluation
      environ = pyproject-nix.lib.pep508.mkEnviron python;
    
      # Transform lock into a Pyproject.nix build overlay.
      # This will create packages from the lock.
      overlay =
        pyfinal: _pyprev:
        lib.mapAttrs (
          name: lockpkg:
          # If package is a local package use a project loader from pyproject-nix.lib.project
          if lockpkg.src.type == "path" then
            (
              let
                project = pyproject-nix.project.loadPyprojectDynamic {
                  projectRoot = lockpkg.src.path;
                };
              in
              pyfinal.callPackage (
                # Function called with callPackage
                {
                  stdenv,
                  pyprojectHook,
                  resolveBuildSystem,
                }:
                # Call stdenv.mkDerivation with project
                stdenv.mkDerivation (
                  # Render stdenv.mkDerivation arguments from project
                  pyproject-nix.build.lib.renderers.mkDerivation
                    {
                      inherit project environ;
                    }
                    {
                      inherit pyprojectHook resolveBuildSystem;
                    }
                )
              ) { }
            )
          # If a package is a remote (pypi) package there is no ready made renderers to use.
          # You need to apply your own transformations.
          else if lockpkg.src.type == "pypi" then
            pyfinal.callPackage (
              {
                stdenv,
                fetchurl,
                pyprojectHook,
                resolveBuildSystem,
              }:
              stdenv.mkDerivation {
                pname = lockpkg.name;
                inherit (lockpkg) version;
                src = fetchurl lockpkg.src;
    
                nativeBuildInputs = [\
                  # Add hook responsible for configuring, building & installing.\
                  pyprojectHook\
                ]
                # Build systems needs to be resolved since we don't propagate dependencies.
                # Otherwise dependencies of our build-system will be missing.
                ++ resolveBuildSystem lockpkg.build-system;
    
                # Dependencies go in passthru to avoid polluting runtime package.
                passthru = {
                  inherit (lockpkg) dependencies optional-dependencies;
                };
              }
            ) { }
          else
            throw "Unhandled src type: ${lockpkg.src.type}" null
        ) lock;
    
      # Override set
      pythonSet = baseSet.overrideScope (
        _final: _prev: {
          # Override build platform dependencies
          #
          # Use this when overriding build-systems that need to run on the build platform.
          pythonPkgsBuildHost = overlay;
    
          # Override target platform packages.
          #
          # Use this to override packages for the target platform.
          pythonPkgsHostHost = overlay;
        }
      );
    
    in
    # Create a virtual environment containing our dependency specification
    pythonSet.pythonPkgsHostHost.mkVirtualEnv "example-venv" {
      # Depend on package
      build = [ ];
    }

---

# Overriding build systems - uv2nix

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uv2nix
======

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[](https://github.com/pyproject-nix/uv2nix "Git repository")

Overriding many build systems manually can quickly become tiresome with repeated declarations of `nativeBuildInputs` & calls to `resolveBuildSystem` for every package.

This overlay shows one strategy to deal with many build system overrides in a declarative fashion.

    final: prev:
    let
      inherit (final) resolveBuildSystem;
      inherit (builtins) mapAttrs;
    
      # Build system dependencies specified in the shape expected by resolveBuildSystem
      # The empty lists below are lists of optional dependencies.
      #
      # A package `foo` with specification written as:
      # `setuptools-scm[toml]` in pyproject.toml would be written as
      # `foo.setuptools-scm = [ "toml" ]` in Nix
      buildSystemOverrides = {
        attrs = {
          hatchling = [ ];
          hatch-vcs = [ ];
          hatch-fancy-pypi-readme = [ ];
        };
        hatchling = {
          pathspec = [ ];
          pluggy = [ ];
          packaging = [ ];
          trove-classifiers = [ ];
        };
        pathspec = {
          flit-core = [ ];
        };
        pluggy = {
          setuptools = [ ];
        };
        trove-classifiers = {
          setuptools = [ ];
        };
        tomli.flit-core = [ ];
        coverage.setuptools = [ ];
        blinker.setuptools = [ ];
        certifi.setuptools = [ ];
        charset-normalizer.setuptools = [ ];
        idna.flit-core = [ ];
        urllib3 = {
          hatchling = [ ];
          hatch-vcs = [ ];
        };
        pip = {
          setuptools = [ ];
          wheel = [ ];
        };
        packaging.flit-core = [ ];
        requests.setuptools = [ ];
        pysocks.setuptools = [ ];
        pytest-cov.setuptools = [ ];
        tqdm.setuptools = [ ];
      };
    
    in
    mapAttrs (
      name: spec:
      prev.${name}.overrideAttrs (old: {
        nativeBuildInputs = old.nativeBuildInputs ++ resolveBuildSystem spec;
      })
    ) buildSystemOverrides

---

# Advanced build systems (editables) - uv2nix

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uv2nix
======

[](https://pyproject-nix.github.io/uv2nix/print.html "Print this book")
[](https://github.com/pyproject-nix/uv2nix "Git repository")

When using more advanced build systems, such as `cython` which builds native dependencies, or `meson-python` which relies on import hooks to dynamically perform recompilation on import an additional step needs to be taken to bridge the gap between the sandboxed Nix build and the source tree:

    pkgs.mkShell {
      packages = [\
        virtualenv\
        pkgs.uv\
    \
        # Add build-editable package from pyproject.nix\
        pyproject-nix.packages.${system}.build-editable\
      ];
    
      env = {
        UV_NO_SYNC = "1";
        UV_PYTHON = python.interpreter;
        UV_PYTHON_DOWNLOADS = "never";
      };
    
      shellHook = ''
        unset PYTHONPATH
        export REPO_ROOT=$(git rev-parse --show-toplevel)
    
        # Re-run editable package build for side effects
        build-editable
      '';
    };
    

Whenever you want to perform a build invoke `build-editable` which will in turn invoke your build system and write side effects such as `.so`'s in-place in your source tree. For most (all?) pure-Python build systems this is not relevant.

---

# Getting started - uv2nix

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uv2nix
======

[](https://pyproject-nix.github.io/uv2nix/print.html "Print this book")
[](https://github.com/pyproject-nix/uv2nix "Git repository")

Before going further and adopting uv2nix, first consider if you really want/need it. You don't need uv2nix to develop uv projects with Nix.

If you are not deploying your application with Nix it's likely that you don't want uv2nix and might be fine using the [`impure` template from `pyproject.nix`](https://pyproject-nix.github.io/pyproject.nix/templates.html#impure)
:

    nix flake init --template github:pyproject-nix/pyproject.nix#impure
    

It's also possible that you might want to develop your package(s) in an impure shell (as opposed to using editables with uv2nix, see development shell below), but deploy using uv2nix.

Any combination of approaches is possible, with different trade-offs for each.

This getting started guide is intended to be read alongside the `hello-world` [uv2nix template](https://pyproject-nix.github.io/uv2nix/templates.html)
:

    nix flake init --template github:pyproject-nix/uv2nix#hello-world
    

which contains much of the same code, but without elaboration or explanation of all the involved concepts.

Before anything can be done enter a development shell with required bootstrapping dependencies:

    nix-shell -p python3 uv
    

And then use uv to create a boilerplate `pyproject.toml` & a `uv.lock`:

    uv init --app --package
    uv lock
    

You can now start [adding dependencies](https://docs.astral.sh/uv/#projects)
 & more.

Uv2nix uses [`pyproject.nix` Python builders](https://pyproject-nix.github.io/pyproject.nix/build.html)
 which needs to be instantiated with a nixpkgs instance:

    pythonBase = pkgs.callPackage pyproject-nix.build.packages {
      inherit python;
    };
    

Creates the necessary structure & build hooks, but it doesn't contain any Python packages itself. In uv2nix all Python packages are generated from `uv.lock` & explicitly added through [overlays](https://nixos.org/manual/nixpkgs/unstable/#chap-overlays)
.

The top-level abstraction in uv2nix is the [_workspace_](https://docs.astral.sh/uv/concepts/projects/workspaces/)
, which needs to be loaded.

    workspace = uv2nix.lib.workspace.loadWorkspace { workspaceRoot = ./.; };
    

Will recursively discover, load & parse all necessary member projects in a uv workspace.

Uv2nix treats every project as a workspace project, even if it only contains a single `pyproject.toml` with a single project.

Takes `uv.lock` & creates an overlay for use with `pyproject.nix` builders.

    overlay = workspace.mkPyprojectOverlay {
      sourcePreference = "wheel";
    };
    

With `sourcePreference` you have a choice to make:

*   `wheel`

Prefer downloading packages as binary wheels.

*   `sdist`

Prefer building packages from source.

Binary wheels are much more likely to "just work" while sdists require manual [overrides](https://pyproject-nix.github.io/uv2nix/overriding/index.html)
 more often. Wheel/sdist selection can also be done on a per-package basis.

If you are experiencing uv2nix using an sdist where you expect it to use a wheel on MacOS you might need to set the appropriate [platform quirks](https://pyproject-nix.github.io/uv2nix/platform-quirks.html)
.

uv [doesn't lock build systems](https://github.com/astral-sh/uv/issues/5190)
 which are required when building packages from source. uv2nix doesn't try to hide this definiency, but instead has an [overlay with the most common ones provided](https://github.com/pyproject-nix/build-system-pkgs)
.

The build system overlay has the same sdist/wheel distinction as `mkPyprojectOverlay`:

*   `pyproject-build-systems.overlays.wheel`

Prefer build systems from binary wheels

*   `pyproject-build-systems.overlays.sdist`

Prefer build systems packages from source

Compose the Python base set + build systems + `uv.lock` generated packages into a concrete Python set:

    pythonSet = pythonBase.overrideScope (
      lib.composeManyExtensions [\
        pyproject-build-systems.overlays.wheel\
        overlay\
      ]
    );
    

This set contains all Python packages as individual attributes.

Uv2nix [builds packages individually](https://pyproject-nix.github.io/pyproject.nix/build.html#solution-presented-by-pyprojectnixs-builders)
, but they aren't really useful until they're aggregated into a virtual environment.

The most convienent way to build a virtualenv is to use one of the dependency presets:

    pythonSet.mkVirtualEnv "hello-world-env" workspace.deps.default
    

But it's also possible to specify which dependencies to install explicitly:

    pythonSet.mkVirtualEnv "hello-world-env" {
      # Install hello-world with no enabled extras
      hello-world = [ ];
    }
    

To ship package where the virtualenv is hidden see [shipping applications](https://pyproject-nix.github.io/uv2nix/patterns/applications.html)
.

When developing Python packages local packages are normally installed in [editable mode](https://setuptools.pypa.io/en/latest/userguide/development_mode.html)
. Editable packages make [entry points](https://packaging.python.org/en/latest/specifications/pyproject-toml/#entry-points)
 like `scripts` available in the virtual environment, but instead of installed Python files the virtualenv contains pointers to the source tree. This means that changes to the sources are immeditately activated and doesn't require a rebuild.

Uv2nix supports editable packages, but requires you to generate a separate overlay & package set for them:

    editableOverlay = workspace.mkEditablePyprojectOverlay {
      # Use environment variable pointing to editable root directory
      root = "$REPO_ROOT";
      # Optional: Only enable editable for these packages
      # members = [ "hello-world" ];
    };
    
    editablePythonSet = pythonSet.overrideScope editableOverlay;
    
    virtualenv = editablePythonSet.mkVirtualEnv "hello-world-dev-env" workspace.deps.all;
    

While not strictly required it's a good idea to apply [source filtering](https://pyproject-nix.github.io/uv2nix/patterns/source-filtering.html)
 to reduce how often editable packages need to be rebuilt.

The virtualenv can then be used with [`mkShell`](https://nixos.org/manual/nixpkgs/unstable/#sec-pkgs-mkShell)
:

    pkgs.mkShell {
      packages = [\
        virtualenv\
        pkgs.uv\
      ];
    
      env = {
        UV_NO_SYNC = "1";
        UV_PYTHON = editablePythonSet.python.interpreter;
        UV_PYTHON_DOWNLOADS = "never";
      };
    
      shellHook = ''
        unset PYTHONPATH
        export REPO_ROOT=$(git rev-parse --show-toplevel)
      '';
    }
    

The `env` attribute contains these settings:

*   `UV_NO_SYNC`
    
    Prevent uv from managing a virtual environment, this is managed by uv2nix.
    
*   `UV_PYTHON`
    
    Use interpreter path for all uv operations.
    
*   `UV_PYTHON_DOWNLOADS`
    
    Prevent uv from downloading [managed Python interpreters](https://docs.astral.sh/uv/#python-versions)
    , we use Nix instead.
    

The `shellHook` contains two interesting pieces:

*   Unsetting `PYTHONPATH`
    
    Unset to eliminate bad [side effects from Nixpkgs Python builders](https://pyproject-nix.github.io/pyproject.nix/build.html#pythonpath-leaking-into-unrelated-builds)
    .
    
*   Setting `REPO_ROOT`
    
    To inform the virtualenv which directory editable packages are relative to.
    

Some advanced build systems (like `meson-python`) are more involved & require [additional setup](https://pyproject-nix.github.io/uv2nix/patterns/advanced-build-systems.html)
.

---

# overriding packages - Pyproject.nix

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Pyproject.nix
=============

[](https://pyproject-nix.github.io/pyproject.nix/print.html "Print this book")
[](https://github.com/pyproject-nix/pyproject.nix "Git repository")

Lock file consumers can only work with what it has, and important metadata is notably absent from all current package managers.

Take a [uv](https://docs.astral.sh/uv/)
 lock file entry for `pyzmq` as an example:

    [[package]]
    name = "pyzmq"
    version = "26.2.0"
    source = { registry = "https://pypi.org/simple" }
    dependencies = [\
        { name = "cffi", marker = "implementation_name == 'pypy'" },\
    ]
    sdist = { url = "https://files.pythonhosted.org/packages/fd/05/bed626b9f7bb2322cdbbf7b4bd8f54b1b617b0d2ab2d3547d6e39428a48e/pyzmq-26.2.0.tar.gz", hash = "sha256:070672c258581c8e4f640b5159297580a9974b026043bd4ab0470be9ed324f1f", size = 271975 }
    wheels = [\
        { url = "https://files.pythonhosted.org/packages/28/2f/78a766c8913ad62b28581777ac4ede50c6d9f249d39c2963e279524a1bbe/pyzmq-26.2.0-cp312-cp312-macosx_10_15_universal2.whl", hash = "sha256:ded0fc7d90fe93ae0b18059930086c51e640cdd3baebdc783a695c77f123dcd9", size = 1343105 },\
        # More binary wheels removed for brevity\
    ]
    

And contrast it with a minimal manually package example to build the same package:

    { stdenv, pyprojectHook, fetchurl }:
    stdenv.mkDerivation {
      pname = "pyzmq";
      version = "26.2.0";
    
      src = fetchurl {
        url = "https://files.pythonhosted.org/packages/fd/05/bed626b9f7bb2322cdbbf7b4bd8f54b1b617b0d2ab2d3547d6e39428a48e/pyzmq-26.2.0.tar.gz";
        hash = "sha256:070672c258581c8e4f640b5159297580a9974b026043bd4ab0470be9ed324f1f";
      };
    
      dontUseCmakeConfigure = true;
    
      buildInputs = [ zeromq ];
    
      nativeBuildInputs = [ pyprojectHook ] ++ resolveBuildSystem ({
        cmake = [];
        ninja = [];
        packaging = [];
        pathspec = [];
        scikit-build-core = [];
      } // if python.isPyPy then { cffi = []; } else { cython = []; });
    
      passthru.dependencies = lib.optionalAttrs python.isPyPy { cffi = []; };
    }
    

Notably absent from `uv.lock` are:

*   Native libraries

When building binary wheels `pyproject.nix` uses [https://nixos.org/manual/nixpkgs/stable/#setup-hook-autopatchelfhook](https://pyproject-nix.github.io/pyproject.nix/builders/autoPatchelfHook)
. This patches RPATH's of wheels with native libraries, but those must be present at build time.

*   [PEP-517](https://peps.python.org/pep-0517/)
     build systems

Uv, like most Python package managers, installs binary wheels by default, and its solver doesn't take into account bootstrapping dependencies. When building from an sdist instead of a wheel build systems will need to be added.

When overriding a binary wheel, only runtime dependencies needs to be added. The `build-system.requires` section isn't relevant.

    { pkgs, pyproject-nix }:
    let
      pythonSet = pkgs.callPackage pyproject-nix.build.packages {
        inherit python;
      };
    
      pyprojectOverrides = final: prev: {
        pyzmq = prev.pyzmq.overrideAttrs(old: {
          buildInputs = (old.buildInputs or [ ]) ++ [ pkgs.zeromq ];
        });
      };
    
    in
      pythonSet.overrideScope pyprojectOverrides
    

When building from sources, both runtime dependencies and `build-system.requires` are important.

    { pkgs, pyproject-nix }:
    let
      pythonSet = pkgs.callPackage pyproject-nix.build.packages {
        inherit python;
      };
    
      pyprojectOverrides = final: prev: {
        pyzmq = prev.pyzmq.overrideAttrs(old: {
          buildInputs = (old.buildInputs or [ ]) ++ [ pkgs.zeromq ];
          dontUseCmakeConfigure = true;
          nativeBuildInputs = (old.nativeBuildInputs or []) ++ final.resolveBuildSystem ({
            cmake = [];
            ninja = [];
            packaging = [];
            pathspec = [];
            scikit-build-core = [];
          } // if python.isPyPy then { cffi = []; } else { cython = []; });
        });
      };
    
    in
      pythonSet.overrideScope pyprojectOverrides
    

If cross compiling, build fixups might need to be applied to the build platform as well as the target platform.

When native compiling `pythonPkgsBuildHost` is aliased to the main set, meaning that overrides automatically apply to both. When cross compiling `pythonPkgsBuildHost` is a Python set created for the _build host_.

    { pkgs, pyproject-nix }:
    let
      pythonSet = pkgs.callPackage pyproject-nix.build.packages {
        inherit python;
      };
    
      pyprojectOverrides = final: prev: {
        pyzmq = prev.pyzmq.overrideAttrs(old: {
          buildInputs = (old.buildInputs or [ ]) ++ [ pkgs.zeromq ];
      });
    
      pyprojectCrossOverrides = lib.composeExtensions (_final: prev: {
        pythonPkgsBuildHost = prev.pythonPkgsBuildHost.overrideScope overlay;
      }) overlay;
    
    
    in
      pythonSet.overrideScope pyprojectCrossOverrides
    

When not cross compiling `pythonPkgsBuildHost` is aliased to the main Python set, so overrides will apply to both automatically.

For utility functions to deal with some common packaging issues see [hacks](https://pyproject-nix.github.io/pyproject.nix/builders/hacks.html)
.

---

# Flake Templates - uv2nix

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uv2nix
======

[](https://pyproject-nix.github.io/uv2nix/print.html "Print this book")
[](https://github.com/pyproject-nix/uv2nix "Git repository")

A minimal example using uv2nix for both development & packaging.

    nix flake init --template github:pyproject-nix/uv2nix#hello-world
    

Building on on the `hello-world` template, adding a dependency on the [tkinter](https://docs.python.org/3/library/tkinter.html)
 graphics library.

Tkinter is normally shipped with Python and not published on PyPI. For closure size reasons nixpkgs splits out `tkinter` to it's own separate package in the nixpkgs Python package set.

    nix flake init --template github:pyproject-nix/uv2nix#hello-tkinter
    

Use uv2nix with locked [inline metadata scripts](https://docs.astral.sh/uv/#scripts)
.

    nix flake init --template github:pyproject-nix/uv2nix#inline-metadata

---

# Shipping applications - uv2nix

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uv2nix
======

[](https://pyproject-nix.github.io/uv2nix/print.html "Print this book")
[](https://github.com/pyproject-nix/uv2nix "Git repository")

`uv2nix` primarily builds [_virtual environments_](https://docs.python.org/3/library/venv.html)
, not individual applications.

Sometimes the fact that an application is written in Python & using a virtualenv is an implementation detail that you don't want to expose in your Nix package.

For such cases `pyproject.nix` provides a utility function [`mkApplication`](https://pyproject-nix.github.io/pyproject.nix/build/util.html#function-library-build.util.mkApplication)
:

    {
        packages = forAllSystems (
          system:
          let
            pythonSet = pythonSets.${system};
            pkgs = nixpkgs.legacyPackages.${system};
            inherit (pkgs.callPackages pyproject-nix.build.util { }) mkApplication;
          in
          {
            # Create a derivation that wraps the venv but that only links package
            # content present in pythonSet.hello-world.
            #
            # This means that files such as:
            # - Python interpreters
            # - Activation scripts
            # - pyvenv.cfg
            #
            # Are excluded but things like binaries, man pages, systemd units etc are included.
            default = mkApplication {
              venv = pythonSet.mkVirtualEnv "application-env" workspace.deps.default;
              package = pythonSet.hello-world;
          };
    }

---

# hacks - Pyproject.nix

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Pyproject.nix
=============

[](https://pyproject-nix.github.io/pyproject.nix/print.html "Print this book")
[](https://github.com/pyproject-nix/pyproject.nix "Git repository")

This documentation is a guide, for more details see [hacks library reference](https://pyproject-nix.github.io/pyproject.nix/build/hacks.html)
.

Sometimes making a package building from source can be difficult, wheels are not available, and Nixpkgs may already contain source-built packages. In such cases it can be tempting to reuse build outputs from Nixpkgs, just as you would use a binary wheel from PyPI.

`pyproject.nix` provides an adapter:

    { callPackage, pyproject-nix, python3, python3Packages }:
    let
      python = python3;
    
      hacks = callPackage pyproject-nix.build.hacks {};
    
      overlay = final: prev: {
        # Adapt torch from nixpkgs
        torch = hacks.nixpkgsPrebuilt {
          from = python3Packages.torchWithoutCuda;
          prev = prev.torch;
        };
      };
    
      pythonSet = (callPackage pyproject-nix.build.packages {
        inherit python;
      }).overrideScope overlay;
    in
      pythonSet.mkVirtualenv "torch-venv" {
        torch = [ ];
      }
    

You may also want to filter out certain dependencies, `torch` in particular depends on a number of PyPI packages containing binary shared objects that are already linked by `torch` from nixpkgs.

    hacks.nixpkgsPrebuilt {
      from = python3Packages.torchWithoutCuda;
      prev = prev.torch.overrideAttrs(old: {
        passthru = old.passthru // {
          dependencies = lib.filterAttrs (name: _: ! lib.hasPrefix "nvidia" name) old.passthru.dependencies;
        };
      });
    };
    

Rust has its own package manager, Cargo, that expects to be able to download dependencies at build-time. One way to deal with that is to use [rustPlatform.importCargoLock](https://nixos.org/manual/nixpkgs/stable/#vendoring-of-dependencies)
.

This mechanism uses IFD (import-from-derivation) on non-local packages. For background as to why IFD should be avoided see

*   [fzakaria - Nix parallelism & Import From Derivation](https://fzakaria.com/2020/10/20/nix-parallelism-import-from-derivation.html)
    .

To adapt the `cryptography` Python package into creating a Rust vendor directory, and use it for building:

    final: prev: {
      cryptography =
        (hacks.importCargoLock {
          prev = prev.cryptography;
          # Cryptography uses a non-standard location for it's Rust packaging
          cargoRoot = "src/rust";
        });
    }
    

In reality, the package still lacks some important metadata, such as native non-Rust dependencies that needs to be supplemented. Depending on which lock file produced this package it may also need build-systems added.

    final: prev: {
      cryptography =
        (hacks.importCargoLock {
          prev = prev.cryptography;
          # Cryptography uses a non-standard location for it's Rust packaging
          cargoRoot = "src/rust";
        }).overrideAttrs
          (old: {
            nativeBuildInputs =
              old.nativeBuildInputs
              ++ final.resolveBuildSystem {
                maturin = [ ];
                setuptools = [ ];
                cffi = [ ];
                pycparser = [ ];
              };
            buildInputs = old.buildInputs or [ ] ++ [ pkgs.openssl ];
          });
    }
    

If you'd like to keep using nixpkgs as a base but generate an overlay for some generated packages, use `hacks.toNixpkgs`:

    { callPackage, pyproject-nix, python3 }:
    let
      python = python3;
    
      hacks = callPackage pyproject-nix.build.hacks {};
    
      # Note: pythonSet would normally be generated by uv2nix
      pythonSet = callPackage pyproject-nix.build.packages {
        inherit python;
      };
    
      overlay = hacks.toNixpkgs {
        inherit pythonSet;
        packages = [\
          "urllib3" # Use generated urllib3\
        ];
      };
    
      python = python3.override {
        self = python;
        packageOverrides = overlay;
      };
    
    in
      python.withPackages(ps: [ ps.urllib3 ])

---

# pep508 - Pyproject.nix

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Pyproject.nix
=============

[](https://pyproject-nix.github.io/pyproject.nix/print.html "Print this book")
[](https://github.com/pyproject-nix/pyproject.nix "Git repository")

**Type**: `parseMarkers :: string -> AttrSet`

Parse PEP 508 markers into an AST.

::: {.example #function-library-example-lib.pep508.parseMarkers}

    # parseMarkers "(os_name=='a' or os_name=='b') and os_name=='c'"
    {
      lhs = {
        lhs = {
          lhs = {
            type = "variable";
            value = "os_name";
          };
          op = "==";
          rhs = {
            type = "string";
            value = "a";
          };
          type = "compare";
        };
        op = "or";
        rhs = {
          lhs = {
            type = "variable";
            value = "os_name";
          };
          op = "==";
          rhs = {
            type = "string";
            value = "b";
          };
          type = "compare";
        };
        type = "boolOp";
      };
      op = "and";
      rhs = {
        lhs = {
          type = "variable";
          value = "os_name";
        };
        op = "==";
        rhs = {
          type = "string";
          value = "c";
        };
        type = "compare";
      };
      type = "boolOp";
    }
    

:::

**Type**: `parseString :: string -> AttrSet`

Parse a PEP-508 dependency string.

`input`

: Function argument

::: {.example #function-library-example-lib.pep508.parseString}

    # parseString "cachecontrol[filecache]>=0.13.0"
    {
      conditions = [\
        {\
          op = ">=";\
          version = {\
            dev = null;\
            epoch = 0;\
            local = null;\
            post = null;\
            pre = null;\
            release = [ 0 13 0 ];\
          };\
        }\
      ];
      markers = null;
      name = "cachecontrol";
      extras = [ "filecache" ];
      url = null;
    }
    

:::

**Type**: `mkEnviron :: derivation -> AttrSet`

Create an attrset of platform variables. As described in https://peps.python.org/pep-0508/#environment-markers.

`python`

: Function argument

::: {.example #function-library-example-lib.pep508.mkEnviron}

    # mkEnviron pkgs.python3
    {
      implementation_name = {
        type = "string";
        value = "cpython";
      };
      implementation_version = {
        type = "version";
        value = {
          dev = null;
          epoch = 0;
          local = null;
          post = null;
          pre = null;
          release = [ 3 10 12 ];
        };
      };
      os_name = {
        type = "string";
        value = "posix";
      };
      platform_machine = {
        type = "string";
        value = "x86_64";
      };
      platform_python_implementation = {
        type = "string";
        value = "CPython";
      };
      # platform_release maps to platform.release() which returns
      # the running kernel version on Linux.
      # Because this field is not reproducible it's left empty.
      platform_release = {
        type = "string";
        value = "";
      };
      platform_system = {
        type = "string";
        value = "Linux";
      };
      # platform_version maps to platform.version() which also returns
      # the running kernel version on Linux.
      # Because this field is not reproducible it's left empty.
      platform_version = {
        type = "version";
        value = {
          dev = null;
          epoch = 0;
          local = null;
          post = null;
          pre = null;
          release = [ ];
        };
      };
      python_full_version = {
        type = "version";
        value = {
          dev = null;
          epoch = 0;
          local = null;
          post = null;
          pre = null;
          release = [ 3 10 12 ];
        };
      };
      python_version = {
        type = "version";
        value = {
          dev = null;
          epoch = 0;
          local = null;
          post = null;
          pre = null;
          release = [ 3 10 ];
        };
      };
      sys_platform = {
        type = "string";
        value = "linux";
      };
    }
    

:::

Update one or more keys in an environment created by mkEnviron.

`environ`

: Function argument

`updates`

: Function argument

::: {.example #function-library-example-lib.pep508.setEnviron}

    # setEnviron (mkEnviron pkgs.python3) { platform_release = "5.10.65";  }
    

:::

**Type**: `evalMarkers :: AttrSet -> AttrSet -> bool`

Evaluate an environment as returned by `mkEnviron` against markers as returend by `parseMarkers`.

`environ`

: Function argument

`value`

: Function argument

::: {.example #function-library-example-lib.pep508.evalMarkers}

    # evalMarkers (mkEnviron pkgs.python3) (parseMarkers "python_version < \"3.11\"")
    true
    

:::

---

# Pyproject.nix

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Pyproject.nix
=============

[](https://pyproject-nix.github.io/pyproject.nix/print.html "Print this book")
[](https://github.com/pyproject-nix/pyproject.nix "Git repository")

Pyproject.nix is a collection of Nix utilities to work with Python project metadata in [Nix](https://nixos.org/)
. It mainly targets [PEP-621](https://peps.python.org/pep-0621/)
 compliant `pyproject.toml` files and data formats, but also implement support for other & legacy formats such as [Poetry](https://python-poetry.org/)
 & `requirements.txt`.

Pyproject.nix aims to be a swiss army knife of simple customizable utilities that works either together with the [nixpkgs Python infrastructure](https://nixos.org/manual/nixpkgs/stable/#python)
, or [our own build infrastructure](https://pyproject-nix.github.io/pyproject.nix/build.html)
.

This documentation only helps you to get started with `pyproject.nix`. As it's a toolkit with many use cases not every use case can be documented fully.

First and foremost `pyproject.nix` is a _Python metadata toolkit_, and not a 2nix tool.

This documentation is centered around packaging Python applications & managing development environments. For other use cases see the reference documentation.

`pyproject.nix` introduces a few high level abstract concepts. The best way to get started is to understand these concepts and how they fit together.

### [Project](https://pyproject-nix.github.io/pyproject.nix/lib/project.html)

A `project` attribute set is a high-level representation of a project that includes:

*   The parsed `pyproject.toml` file
*   Parsed dependencies
*   Project root directory

It can can be loaded from many different sources:

*   PEP-621 `pyproject.toml`
*   PEP-621 `pyproject.toml` with PDM extensions
*   Poetry `pyproject.toml`
*   `requirements.txt`

### [Validators](https://pyproject-nix.github.io/pyproject.nix/lib/validators.html)

Validators work on dependency constraints as defined in a `project` and offers validation for them. This can be useful to check that a package set is compliant with the specification.

### [Renderers](https://pyproject-nix.github.io/pyproject.nix/lib/renderers.html)

A `renderer` takes a `project` together with a Python interpreter derivation and renders it into a form understood by various pieces of Python infrastructure.

For example: The `buildPythonPackage` renderer returns an attribute set that can be passed to either nixpkgs function `buildPythonPackage` or `buildPythonApplication`.

There might be information missing from what a renderer returned depending on what can be computed from the `project`. If any attributes are missing you can manually merge your own attribute set with what the renderer returned.

For a concrete example use see [Use cases -> pyproject.toml](https://pyproject-nix.github.io/pyproject.nix/use-cases/pyproject.html)
.

Documentation examples in `pyproject.nix` are using Flakes for the convenience of grouping multiple concepts into a single file.

You can just as easily import `pyproject.nix` without using Flakes:

    let
      pkgs = import <nixpkgs> { };
      inherit (pkgs) lib;
    
      pyproject-nix = import (builtins.fetchGit {
        url = "https://github.com/pyproject-nix/pyproject.nix.git";
      }) {
        inherit lib;
      };
    
    in ...
    

See [use-cases/pyproject.toml](https://pyproject-nix.github.io/pyproject.nix/use-cases/pyproject.html)
.

It's possible to develop [PEP-621](https://peps.python.org/pep-0621/)
 compliant Python projects without using _any_ Python package manager except Nix.

This example loads `pyproject.toml` to create an environment using [`python.withPackages`](https://nixos.org/manual/nixpkgs/stable/#user-guide)
 and a consumable package using `python.pkgs.buildPythonPackage`.

    {
      description = "A basic flake using pyproject.toml project metadata";
    
      inputs.pyproject-nix.url = "github:pyproject-nix/pyproject.nix";
      inputs.pyproject-nix.inputs.nixpkgs.follows = "nixpkgs";
    
      outputs =
        { nixpkgs, pyproject-nix, ... }:
        let
          # Loads pyproject.toml into a high-level project representation
          # Do you notice how this is not tied to any `system` attribute or package sets?
          # That is because `project` refers to a pure data representation.
          project = pyproject-nix.lib.project.loadPyproject {
            # Read & unmarshal pyproject.toml relative to this project root.
            # projectRoot is also used to set `src` for renderers such as buildPythonPackage.
            projectRoot = ./.;
          };
    
          # This example is only using x86_64-linux
          pkgs = nixpkgs.legacyPackages.x86_64-linux;
    
          # We are using the default nixpkgs Python3 interpreter & package set.
          #
          # This means that you are purposefully ignoring:
          # - Version bounds
          # - Dependency sources (meaning local path dependencies won't resolve to the local path)
          #
          # To use packages from local sources see "Overriding Python packages" in the nixpkgs manual:
          # https://nixos.org/manual/nixpkgs/stable/#reference
          #
          # Or use an overlay generator such as uv2nix:
          # https://github.com/pyproject-nix/uv2nix
          python = pkgs.python3;
    
        in
        {
          # Create a development shell containing dependencies from `pyproject.toml`
          devShells.x86_64-linux.default =
            let
              # Returns a function that can be passed to `python.withPackages`
              arg = project.renderers.withPackages { inherit python; };
    
              # Returns a wrapped environment (virtualenv like) with all our packages
              pythonEnv = python.withPackages arg;
    
            in
            # Create a devShell like normal.
            pkgs.mkShell { packages = [ pythonEnv ]; };
    
          # Build our package using `buildPythonPackage
          packages.x86_64-linux.default =
            let
              # Returns an attribute set that can be passed to `buildPythonPackage`.
              attrs = project.renderers.buildPythonPackage { inherit python; };
            in
            # Pass attributes to buildPythonPackage.
            # Here is a good spot to add on any missing or custom attributes.
            python.pkgs.buildPythonPackage (attrs // { env.CUSTOM_ENVVAR = "hello"; });
        };
    }
    

    [project]
    name = "hello-python"
    version = "0.1.0"
    description = "A minimal pyproject.toml"
    authors = [ ]
    requires-python = ">=3.13"
    dependencies = []
    

Many projects comes without proper packaging and use [`requirements.txt`](https://pip.pypa.io/en/stable/reference/requirements-file-format/)
 files to declare their dependencies.

This example loads `requirements.txt` to create an environment using [`python.withPackages`](https://nixos.org/manual/nixpkgs/stable/#user-guide)
 with packages from nixpkgs.

    {
      description = "Construct development shell from requirements.txt";
    
      inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
    
      inputs.pyproject-nix.url = "github:pyproject-nix/pyproject.nix";
    
      outputs =
        { nixpkgs, pyproject-nix, ... }:
        let
          # Load/parse requirements.txt
          project = pyproject-nix.lib.project.loadRequirementsTxt { projectRoot = ./.; };
    
          pkgs = nixpkgs.legacyPackages.x86_64-linux;
          python = pkgs.python3;
    
          pythonEnv =
            # Assert that versions from nixpkgs matches what's described in requirements.txt
            # In projects that are overly strict about pinning it might be best to remove this assertion entirely.
            assert project.validators.validateVersionConstraints { inherit python; } == { };
            (
              # Render requirements.txt into a Python withPackages environment
              pkgs.python3.withPackages (project.renderers.withPackages { inherit python; })
            );
    
        in
        {
          devShells.x86_64-linux.default = pkgs.mkShell { packages = [ pythonEnv ]; };
        };
    }
    

The pyproject.nix build infrastructure is mainly targeted at python2nix authors, and is being used in uv2nix.

Pyproject.nix can be used with nixpkgs `buildPythonPackage`/`packageOverrides`/`withPackages`, but also implements its own build infrastructure that fixes many structural problems with the nixpkgs implementation.

Nixpkgs Python infrastructure relies on [dependency propagation](https://nixos.org/manual/nixpkgs/unstable/#ssec-stdenv-dependencies-propagated)
. The propagation mechanism works through making dependencies available to the builder at build-time, and recording their Nix store paths in `$out/nix-support/propagated-build-inputs`. [Setup hooks](https://nixos.org/manual/nixpkgs/unstable/#ssec-setup-hooks)
 are then used to add these packages to `$PYTHONPATH` for discovery by the Python interpreter which adds everything from `$PYTHONPATH` to `sys.path` at startup.

Propagation causes several issues downstream.

Consider the following development shell using nixpkgs Python builders:

    let
      pkgs = import <nixpkgs> { };
      pythonEnv = pkgs.python3.withPackages(ps: [ ps.requests ]);
    in pkgs.mkShell {
      packages = [\
        pkgs.remarshal\
        pythonEnv\
      ];
    }
    

Any Python package, such as `remarshal`, will have their dependencies leaking into `$PYTHONPATH`, making undeclared dependencies available to the Python interpreter. Making matters even worse: Any dependency on `$PYTHONPATH` takes precedence over virtualenv installed dependencies!

Nix dependency graphs are required to be a [DAG](https://en.wikipedia.org/wiki/Directed_acyclic_graph)
, but Python dependencies can be cyclic. Dependency propagation is inherently incompatible with cyclic dependencies. In nixpkgs propagation issues are commonly worked around by patching packages in various ways.

Nixpkgs Python builders uses wrappers for Python executables in `bin/`, these set environment variables `NIX_PYTHONPATH` & friends These environment variables are picked up by the interpreter using a [sitecustomize.py](https://docs.python.org/3/library/site.html#module-sitecustomize)
 in the system `site-packages` directory.

Any Python programs executing another child Python interpreter using `sys.executable` will have it's modules lost on import, as `sys.executable` isn't pointing to the environment created by `withPackages`.

Because `buildPythonPackage` uses propagation runtime dependencies of a package are required to be present at build time.

In Python builds runtime dependencies are not actually required to be present. Making runtime dependencies available at build-time results in derivation hashes changing much more frequently than they have to.

The solution is to decouple the runtime dependency graph from the build time one, by putting runtime dependencies in [passthru](https://nixos.org/manual/nixpkgs/unstable/#chap-passthru)
:

    stdenv.mkDerivation {
      pname = "setuptools-scm";
      version = "8.1.0";
      src = fetchurl {
        url = "https://files.pythonhosted.org/packages/4f/a4/00a9ac1b555294710d4a68d2ce8dfdf39d72aa4d769a7395d05218d88a42/setuptools_scm-8.1.0.tar.gz";
        hash = "";
      };
    
      passthru = {
        dependencies = {
          packaging = [ ];
          setuptools = [ ];
        };
    
        optional-dependencies = {
          toml = { toml = [ ]; };
          rich = { rich = [ ]; };
        };
      };
    
      nativeBuildInputs = [\
        pyprojectHook\
      ] ++ resolveBuildSystem (
        {
          setuptools = [ ];
        }
      );
    }
    

Because runtime dependencies are not propagated every package needs to resolve the runtime dependencies of their build-system's.

Additionally packages can't simply be consumed, but must be aggregated into a virtual environment to be useful:

    { pyproject-nix, pkgs }:
    
    let
      python = pkgs.python312;
    
      # Inject your own packages on top with overrideScope
      pythonSet = pkgs.callPackage pyproject-nix.build.packages {
        inherit python;
      };
    
    in pythonSet.pythonPkgsHostHost.mkVirtualEnv "test-venv" {
      build = [ ];
    }
    

Cyclic dependencies are supported thanks to the resolver returning a flat list of required Python packages. For performance reasons two solvers are implemented:

*   One that does not support cyclic dependencies A much more performant resolver used by resolveBuildSystem and has all known build-systems memoized.
    
*   One that does support cyclic dependencies Used to resolve virtual environments
    

It's possible to override the resolver used entirely, so even though cyclic build-system's are not supported by default, it can be done with overrides.

As the runtime dependency graph is decoupled from the build time one derivation hashes change far less frequently.

An additional benefit is improved build scheduling: Because the dependency graph is much flatter than a `buildPythonPackage` based one derivations can be more efficiently scheduled in parallel.

Instead of binary wrappers & environment variables `pyproject.nix`'s builders use standard Python virtual environments.

While the nixpkgs Python infrastructure is built mainly for manual packaging, `pyproject.nix`'s builders are mainly targeted at lock file consumers like [uv2nix](https://github.com/pyproject-nix/uv2nix)
.

This example shows the essence of implementing a lock file converter in pure Nix using `pyproject.nix`. A real world implementation is more complex. To see a lock file converter built according to `pyproject.nix` best practices see [uv2nix](https://github.com/pyproject-nix/uv2nix)
.

    {
      python,
      callPackage,
      pyproject-nix,
      lib,
    }:
    let
      # Pyproject.nix packages quite a few, but not all build-system dependencies.
      #
      # We only package PyPI packages because lock file generators often miss this metadata, so it's required to help kickstart a Python set.
      # This set is incomplete, and much smaller in both package count and scope than nixpkgs is.
      baseSet = callPackage pyproject-nix.build.packages {
        inherit python;
      };
    
      # A hypothetical over-simplified "lock file" format to demonstrate what typical usage would look like.
      # This format is absent of important data such as PEP-508 markers and more.
      #
      # Also note that all sources are the same. In a real-world file these would of course all be different.
      lock =
        let
          src = {
            type = "pypi";
            url = "https://files.pythonhosted.org/packages/63/70/2bf7780ad2d390a8d301ad0b550f1581eadbd9a20f896afe06353c2a2913/requests-2.32.3.tar.gz";
            hash = "sha256:55365417734eb18255590a9ff9eb97e9e1da868d4ccd6402399eaf68af20a760";
          };
        in
        {
          package-a = {
            name = "a";
            version = "1.0.0";
            dependencies = { };
            optional-dependencies = { };
            inherit src;
            build-system = {
              flit-core = [ ];
            };
          };
    
          package-b = {
            name = "b";
            version = "1.0.0";
            # Depend on a with no optionals
            dependencies = {
              a = [ ];
            };
            inherit src;
            build-system = {
              flit-core = [ ];
            };
          };
    
          package-c = {
            name = "c";
            version = "1.0.0";
            dependencies = {
              a = [ ];
            };
            # Has an optional dependency on b when cool_feature is activated
            optional-dependencies = {
              cool_feature = {
                b = [ ];
              };
            };
            inherit src;
            build-system = {
              flit-core = [ ];
            };
          };
    
          package-d = {
            name = "d";
            version = "1.0.0";
            dependencies = {
              c = [ "cool_feature" ];
            };
            # A local package dependend on by it's path
            src = {
              type = "path";
              path = ./packages/d;
            };
            build-system = {
              flit-core = [ ];
            };
          };
        };
    
      # Create a PEP-508 marker environment for marker evaluation
      environ = pyproject-nix.lib.pep508.mkEnviron python;
    
      # Transform lock into a Pyproject.nix build overlay.
      # This will create packages from the lock.
      overlay =
        pyfinal: _pyprev:
        lib.mapAttrs (
          name: lockpkg:
          # If package is a local package use a project loader from pyproject-nix.lib.project
          if lockpkg.src.type == "path" then
            (
              let
                project = pyproject-nix.project.loadPyprojectDynamic {
                  projectRoot = lockpkg.src.path;
                };
              in
              pyfinal.callPackage (
                # Function called with callPackage
                {
                  stdenv,
                  pyprojectHook,
                  resolveBuildSystem,
                }:
                # Call stdenv.mkDerivation with project
                stdenv.mkDerivation (
                  # Render stdenv.mkDerivation arguments from project
                  pyproject-nix.build.lib.renderers.mkDerivation
                    {
                      inherit project environ;
                    }
                    {
                      inherit pyprojectHook resolveBuildSystem;
                    }
                )
              ) { }
            )
          # If a package is a remote (pypi) package there is no ready made renderers to use.
          # You need to apply your own transformations.
          else if lockpkg.src.type == "pypi" then
            pyfinal.callPackage (
              {
                stdenv,
                fetchurl,
                pyprojectHook,
                resolveBuildSystem,
              }:
              stdenv.mkDerivation {
                pname = lockpkg.name;
                inherit (lockpkg) version;
                src = fetchurl lockpkg.src;
    
                nativeBuildInputs = [\
                  # Add hook responsible for configuring, building & installing.\
                  pyprojectHook\
                ]
                # Build systems needs to be resolved since we don't propagate dependencies.
                # Otherwise dependencies of our build-system will be missing.
                ++ resolveBuildSystem lockpkg.build-system;
    
                # Dependencies go in passthru to avoid polluting runtime package.
                passthru = {
                  inherit (lockpkg) dependencies optional-dependencies;
                };
              }
            ) { }
          else
            throw "Unhandled src type: ${lockpkg.src.type}" null
        ) lock;
    
      # Override set
      pythonSet = baseSet.overrideScope (
        _final: _prev: {
          # Override build platform dependencies
          #
          # Use this when overriding build-systems that need to run on the build platform.
          pythonPkgsBuildHost = overlay;
    
          # Override target platform packages.
          #
          # Use this to override packages for the target platform.
          pythonPkgsHostHost = overlay;
        }
      );
    
    in
    # Create a virtual environment containing our dependency specification
    pythonSet.pythonPkgsHostHost.mkVirtualEnv "example-venv" {
      # Depend on package
      build = [ ];
    }
    

`pyproject.nix`'s base package set only contains the scaffolding for a Python package set, but no actual Python packages.

    # Returns a scope with base packages.
    pkgs.callPackage pyproject-nix.build.packages {
      python = interpreter;
    }
    

For package managers that lack the ability to solve build-system dependencies `pyproject.nix` maintains a [base package set](https://github.com/pyproject-nix/build-system-pkgs)
. This set is much smaller and more narrow in scope than nixpkgs, its purpose is only to package [build-system](https://peps.python.org/pep-0518/)
 dependencies, which are missing from Python package manager lock files, so needs to be supplemented from elsewhere.

See the [nixpkgs documentation](https://nixos.org/manual/nixpkgs/stable/#function-library-lib.customisation.makeScope)
.

Lock file consumers can only work with what it has, and important metadata is notably absent from all current package managers.

Take a [uv](https://docs.astral.sh/uv/)
 lock file entry for `pyzmq` as an example:

    [[package]]
    name = "pyzmq"
    version = "26.2.0"
    source = { registry = "https://pypi.org/simple" }
    dependencies = [\
        { name = "cffi", marker = "implementation_name == 'pypy'" },\
    ]
    sdist = { url = "https://files.pythonhosted.org/packages/fd/05/bed626b9f7bb2322cdbbf7b4bd8f54b1b617b0d2ab2d3547d6e39428a48e/pyzmq-26.2.0.tar.gz", hash = "sha256:070672c258581c8e4f640b5159297580a9974b026043bd4ab0470be9ed324f1f", size = 271975 }
    wheels = [\
        { url = "https://files.pythonhosted.org/packages/28/2f/78a766c8913ad62b28581777ac4ede50c6d9f249d39c2963e279524a1bbe/pyzmq-26.2.0-cp312-cp312-macosx_10_15_universal2.whl", hash = "sha256:ded0fc7d90fe93ae0b18059930086c51e640cdd3baebdc783a695c77f123dcd9", size = 1343105 },\
        # More binary wheels removed for brevity\
    ]
    

And contrast it with a minimal manually package example to build the same package:

    { stdenv, pyprojectHook, fetchurl }:
    stdenv.mkDerivation {
      pname = "pyzmq";
      version = "26.2.0";
    
      src = fetchurl {
        url = "https://files.pythonhosted.org/packages/fd/05/bed626b9f7bb2322cdbbf7b4bd8f54b1b617b0d2ab2d3547d6e39428a48e/pyzmq-26.2.0.tar.gz";
        hash = "sha256:070672c258581c8e4f640b5159297580a9974b026043bd4ab0470be9ed324f1f";
      };
    
      dontUseCmakeConfigure = true;
    
      buildInputs = [ zeromq ];
    
      nativeBuildInputs = [ pyprojectHook ] ++ resolveBuildSystem ({
        cmake = [];
        ninja = [];
        packaging = [];
        pathspec = [];
        scikit-build-core = [];
      } // if python.isPyPy then { cffi = []; } else { cython = []; });
    
      passthru.dependencies = lib.optionalAttrs python.isPyPy { cffi = []; };
    }
    

Notably absent from `uv.lock` are:

*   Native libraries

When building binary wheels `pyproject.nix` uses [https://nixos.org/manual/nixpkgs/stable/#setup-hook-autopatchelfhook](https://pyproject-nix.github.io/pyproject.nix/builders/autoPatchelfHook)
. This patches RPATH's of wheels with native libraries, but those must be present at build time.

*   [PEP-517](https://peps.python.org/pep-0517/)
     build systems

Uv, like most Python package managers, installs binary wheels by default, and its solver doesn't take into account bootstrapping dependencies. When building from an sdist instead of a wheel build systems will need to be added.

When overriding a binary wheel, only runtime dependencies needs to be added. The `build-system.requires` section isn't relevant.

    { pkgs, pyproject-nix }:
    let
      pythonSet = pkgs.callPackage pyproject-nix.build.packages {
        inherit python;
      };
    
      pyprojectOverrides = final: prev: {
        pyzmq = prev.pyzmq.overrideAttrs(old: {
          buildInputs = (old.buildInputs or [ ]) ++ [ pkgs.zeromq ];
        });
      };
    
    in
      pythonSet.overrideScope pyprojectOverrides
    

When building from sources, both runtime dependencies and `build-system.requires` are important.

    { pkgs, pyproject-nix }:
    let
      pythonSet = pkgs.callPackage pyproject-nix.build.packages {
        inherit python;
      };
    
      pyprojectOverrides = final: prev: {
        pyzmq = prev.pyzmq.overrideAttrs(old: {
          buildInputs = (old.buildInputs or [ ]) ++ [ pkgs.zeromq ];
          dontUseCmakeConfigure = true;
          nativeBuildInputs = (old.nativeBuildInputs or []) ++ final.resolveBuildSystem ({
            cmake = [];
            ninja = [];
            packaging = [];
            pathspec = [];
            scikit-build-core = [];
          } // if python.isPyPy then { cffi = []; } else { cython = []; });
        });
      };
    
    in
      pythonSet.overrideScope pyprojectOverrides
    

If cross compiling, build fixups might need to be applied to the build platform as well as the target platform.

When native compiling `pythonPkgsBuildHost` is aliased to the main set, meaning that overrides automatically apply to both. When cross compiling `pythonPkgsBuildHost` is a Python set created for the _build host_.

    { pkgs, pyproject-nix }:
    let
      pythonSet = pkgs.callPackage pyproject-nix.build.packages {
        inherit python;
      };
    
      pyprojectOverrides = final: prev: {
        pyzmq = prev.pyzmq.overrideAttrs(old: {
          buildInputs = (old.buildInputs or [ ]) ++ [ pkgs.zeromq ];
      });
    
      pyprojectCrossOverrides = lib.composeExtensions (_final: prev: {
        pythonPkgsBuildHost = prev.pythonPkgsBuildHost.overrideScope overlay;
      }) overlay;
    
    
    in
      pythonSet.overrideScope pyprojectCrossOverrides
    

When not cross compiling `pythonPkgsBuildHost` is aliased to the main Python set, so overrides will apply to both automatically.

For utility functions to deal with some common packaging issues see [hacks](https://pyproject-nix.github.io/pyproject.nix/builders/hacks.html)
.

This documentation is a guide, for more details see [hacks library reference](https://pyproject-nix.github.io/pyproject.nix/build/hacks.html)
.

Sometimes making a package building from source can be difficult, wheels are not available, and Nixpkgs may already contain source-built packages. In such cases it can be tempting to reuse build outputs from Nixpkgs, just as you would use a binary wheel from PyPI.

`pyproject.nix` provides an adapter:

    { callPackage, pyproject-nix, python3, python3Packages }:
    let
      python = python3;
    
      hacks = callPackage pyproject-nix.build.hacks {};
    
      overlay = final: prev: {
        # Adapt torch from nixpkgs
        torch = hacks.nixpkgsPrebuilt {
          from = python3Packages.torchWithoutCuda;
          prev = prev.torch;
        };
      };
    
      pythonSet = (callPackage pyproject-nix.build.packages {
        inherit python;
      }).overrideScope overlay;
    in
      pythonSet.mkVirtualenv "torch-venv" {
        torch = [ ];
      }
    

You may also want to filter out certain dependencies, `torch` in particular depends on a number of PyPI packages containing binary shared objects that are already linked by `torch` from nixpkgs.

    hacks.nixpkgsPrebuilt {
      from = python3Packages.torchWithoutCuda;
      prev = prev.torch.overrideAttrs(old: {
        passthru = old.passthru // {
          dependencies = lib.filterAttrs (name: _: ! lib.hasPrefix "nvidia" name) old.passthru.dependencies;
        };
      });
    };
    

Rust has its own package manager, Cargo, that expects to be able to download dependencies at build-time. One way to deal with that is to use [rustPlatform.importCargoLock](https://nixos.org/manual/nixpkgs/stable/#vendoring-of-dependencies)
.

This mechanism uses IFD (import-from-derivation) on non-local packages. For background as to why IFD should be avoided see

*   [fzakaria - Nix parallelism & Import From Derivation](https://fzakaria.com/2020/10/20/nix-parallelism-import-from-derivation.html)
    .

To adapt the `cryptography` Python package into creating a Rust vendor directory, and use it for building:

    final: prev: {
      cryptography =
        (hacks.importCargoLock {
          prev = prev.cryptography;
          # Cryptography uses a non-standard location for it's Rust packaging
          cargoRoot = "src/rust";
        });
    }
    

In reality, the package still lacks some important metadata, such as native non-Rust dependencies that needs to be supplemented. Depending on which lock file produced this package it may also need build-systems added.

    final: prev: {
      cryptography =
        (hacks.importCargoLock {
          prev = prev.cryptography;
          # Cryptography uses a non-standard location for it's Rust packaging
          cargoRoot = "src/rust";
        }).overrideAttrs
          (old: {
            nativeBuildInputs =
              old.nativeBuildInputs
              ++ final.resolveBuildSystem {
                maturin = [ ];
                setuptools = [ ];
                cffi = [ ];
                pycparser = [ ];
              };
            buildInputs = old.buildInputs or [ ] ++ [ pkgs.openssl ];
          });
    }
    

If you'd like to keep using nixpkgs as a base but generate an overlay for some generated packages, use `hacks.toNixpkgs`:

    { callPackage, pyproject-nix, python3 }:
    let
      python = python3;
    
      hacks = callPackage pyproject-nix.build.hacks {};
    
      # Note: pythonSet would normally be generated by uv2nix
      pythonSet = callPackage pyproject-nix.build.packages {
        inherit python;
      };
    
      overlay = hacks.toNixpkgs {
        inherit pythonSet;
        packages = [\
          "urllib3" # Use generated urllib3\
        ];
      };
    
      python = python3.override {
        self = python;
        packageOverrides = overlay;
      };
    
    in
      python.withPackages(ps: [ ps.urllib3 ])
    

Projects currently using the `pyproject.nix` builders

Lock file consumers producing package sets

*   [uv2nix](https://github.com/pyproject-nix/uv2nix)
    

*   [build-system-pkgs](https://github.com/pyproject-nix/build-system-pkgs)
    

Override collections to deal with packaging issues

*   [uv2nix\_hammer\_overrides](https://github.com/TyberiusPrime/uv2nix_hammer_overrides/)
    

Pyproject.nix offers a number of Flake templates to quickly get started with developing

To get started with any of the listed templates run (replace `name` with the template name):

Using nixpkgs for Python development based on a PEP-621 `pyproject.toml` file. A quickstart & production version of [use-cases/pyproject](https://pyproject-nix.github.io/pyproject.nix/use-cases/pyproject.html)
.

    nix flake init --template github:pyproject-nix/pyproject.nix#pyproject
    

Use a `requirements.txt` to create a Python environment using nixpkgs Python packages. A quickstart & production version of [use-cases/requirements](https://pyproject-nix.github.io/pyproject.nix/use-cases/requirements.html)
.

    nix flake init --template github:pyproject-nix/pyproject.nix#requirements
    

Simple no frills best practices development shell to develop Python projects with Nix, but without using Nix tooling for Python packages.

Does not depend on `pyproject.nix`.

Uses `uv` for Python package management.

    nix flake init --template github:pyproject-nix/pyproject.nix#impure
    

Package names are normalized according to the [PyPA normalization specification](https://packaging.python.org/en/latest/specifications/name-normalization/#normalization)
. Nixpkgs also uses the same normalization [but has some legacy package names](https://github.com/NixOS/nixpkgs/issues/245383)
 that do not follow normalization guidelines.

The other case where the automatic mapping goes wrong is when the Nixpkgs `python.pkgs` set does not contain a dependency. One such example is `ruff`, a Python linter written in Rust.

Nixpkgs has `ruff` on the top-level (`pkgs`), but not in `python3.pkgs`. In such cases you can use an overlay to add the package to the Python set:

    let
      python = pkgs.python3.override {
        packageOverrides = self: super: {
          ruff = pkgs.ruff;
        };
      };
    in ...
    

Pyproject.nix makes no attempt at parsing dynamic fields as it does not have the required knowledge to infer these.

When using the `withPackages` renderer most fields that may be dynamic are not even relevant and won't cause issues. At other times, like when using the `buildPythonPackage` renderer problems occur as there is no way for the renderer to create the version attribute.

    let
      project = pyproject.project.loadPyproject { pyproject = lib.importTOML ./pyproject.toml; };
      python = pkgs.python3;
      attrs = pyproject.renderers.buildPythonPackage { inherit python project; };
    in python.pkgs.buildPythonPackage attrs
    

Will result in an error from `buildPythonpackage` because `version` is missing:

    error: attribute 'version' missing
    
    at /nix/store/gna8i238i3nnz6cizcayyfyfdzn28la5-nixpkgs/pkgs/development/interpreters/python/mk-python-derivation.nix:31:28:
    
        30|
        31| { name ? "${attrs.pname}-${attrs.version}"
          |                            ^
        32|
    

In these cases you can manually add attributes to the attribute set returned by the renderer:

    let
      project = pyproject.project.loadPyproject { pyproject = lib.importTOML ./pyproject.toml; };
      python = pkgs.python3;
      attrs = pyproject.renderers.buildPythonPackage { inherit python project; };
    in python.pkgs.buildPythonPackage (attrs // {
      version = "1.0";  # Not dynamically inferred
    })
    

The reference documentation is split up into two main categories:

*   User facing APIs

Contains high-level representations and has notions of things like a `project` (a fully parsed `pyproject.toml`) and further operations done on the project level.

*   Standards APIs

Contains parsers, evaluators & utility functions for dealing with Python packaging standards defined by the through the PEP process & from PyPA.

**Type**: `loadPyproject :: AttrSet -> AttrSet`

Load dependencies from a PEP-621 pyproject.toml.

structured function argument

: `pyproject`

: The unmarshaled contents of pyproject.toml

`extrasAttrPaths`

: Example: extrasAttrPaths = \[ "tool.pdm.dev-dependencies" \];

`extrasListPaths`

: Example: extrasListPaths = { "tool.uv.dependencies.dev-dependencies" = "dev-dependencies"; }

`groupsAttrPaths`

: Example: extrasAttrPaths = \[ "tool.pdm.dev-dependencies" \];

`groupsListPaths`

: Example: extrasListPaths = { "tool.uv.dependencies.dev-dependencies" = "dev-dependencies"; }

`projectRoot`

: Path to project root

::: {.example #function-library-example-lib.project.loadPyproject}

    # loadPyproject { pyproject = lib.importTOML }
    {
      dependencies = { }; # Parsed dependency structure in the schema of `lib.pep621.parseDependencies`
      build-systems = [ ];  # Returned by `lib.pep518.parseBuildSystems`
      pyproject = { }; # The unmarshaled contents of pyproject.toml
      projectRoot = null; # Path to project root
      requires-python = null; # requires-python as parsed by pep621.parseRequiresPython
    }
    

:::

**Type**: `loadUVPyproject :: AttrSet -> AttrSet`

Load dependencies from a uv pyproject.toml.

structured function argument

: `pyproject`

: The unmarshaled contents of pyproject.toml

`projectRoot`

: Path to project root

::: {.example #function-library-example-lib.project.loadUVPyproject}

    # loadUVPyproject { projectRoot = ./.; }
    {
      dependencies = { }; # Parsed dependency structure in the schema of `lib.pep621.parseDependencies`
      build-systems = [ ];  # Returned by `lib.pep518.parseBuildSystems`
      pyproject = { }; # The unmarshaled contents of pyproject.toml
      projectRoot = null; # Path to project root
      requires-python = null; # requires-python as parsed by pep621.parseRequiresPython
    }
    

:::

**Type**: `loadPDMPyproject :: AttrSet -> AttrSet`

Load dependencies from a PDM pyproject.toml.

structured function argument

: `pyproject`

: The unmarshaled contents of pyproject.toml

`projectRoot`

: Path to project root

::: {.example #function-library-example-lib.project.loadPDMPyproject}

    # loadPyproject { projectRoot = ./.; }
    {
      dependencies = { }; # Parsed dependency structure in the schema of `lib.pep621.parseDependencies`
      build-systems = [ ];  # Returned by `lib.pep518.parseBuildSystems`
      pyproject = { }; # The unmarshaled contents of pyproject.toml
      projectRoot = null; # Path to project root
      requires-python = null; # requires-python as parsed by pep621.parseRequiresPython
    }
    

:::

**Type**: `loadPoetryPyproject :: AttrSet -> AttrSet`

Load dependencies from a Poetry pyproject.toml.

structured function argument

: `pyproject`

: The unmarshaled contents of pyproject.toml

`projectRoot`

: Path to project root

::: {.example #function-library-example-lib.project.loadPoetryPyproject}

    # loadPoetryPyproject { projectRoot = ./.; }
    {
      dependencies = { }; # Parsed dependency structure in the schema of `lib.pep621.parseDependencies`
      build-systems = [ ];  # Returned by `lib.pep518.parseBuildSystems`
      pyproject = { }; # The unmarshaled contents of pyproject.toml
      projectRoot = null; # Path to project root
      requires-python = null; # requires-python as parsed by pep621.parseRequiresPython
    }
    

:::

**Type**: `loadRequirementsTxt :: AttrSet -> AttrSet`

Load dependencies from a requirements.txt.

Note that as requirements.txt is lacking important project metadata this is incompatible with some renderers.

structured function argument

: `requirements`

: The contents of requirements.txt

`projectRoot`

: Path to project root

::: {.example #function-library-example-lib.project.loadRequirementsTxt}

    # loadRequirementstxt { requirements = builtins.readFile ./requirements.txt; projectRoot = ./.; }
    {
      dependencies = { }; # Parsed dependency structure in the schema of `lib.pep621.parseDependencies`
      build-systems = [ ];  # Returned by `lib.pep518.parseBuildSystems`
      pyproject = null; # The unmarshaled contents of pyproject.toml
      projectRoot = null; # Path to project root
      requires-python = null; # requires-python as parsed by pep621.parseRequiresPython
    }
    

:::

**Type**: `loadPyprojectDynamic :: AttrSet -> AttrSet`

Load dependencies from a either a PEP-621 or Poetry pyproject.toml file. This function is intended for 2nix authors that wants to include local pyproject.toml files but don't know up front whether they're from Poetry or PEP-621.

structured function argument

: `pyproject`

: The unmarshaled contents of pyproject.toml

`projectRoot`

: Path to project root

::: {.example #function-library-example-lib.project.loadPyprojectDynamic}

    # loadPyprojectDynamic { projectRoot = ./.; }
    {
      dependencies = { }; # Parsed dependency structure in the schema of `lib.pep621.parseDependencies`
      build-systems = [ ];  # Returned by `lib.pep518.parseBuildSystems`
      pyproject = { }; # The unmarshaled contents of pyproject.toml
      projectRoot = null; # Path to project root
      requires-python = null; # requires-python as parsed by pep621.parseRequiresPython
    }
    

:::

Load a PEP-723 metadata script from file path or string.

structured function argument

: `name`

: Function argument

`script`

: Function argument

::: {.example #function-library-example-lib.scripts.loadScript}

    # loadScript { script = ./with-inline-metadata.py; }
    {
      name = "with-inline-metadata";
      metadata = { ... }; # Contains dependencies and requires-python
      renderWithPackages = { python }: ...; # renderWithPackages with loaded script pre-applied
    }
    

:::

Render a loaded PEP-723 script as a string with a shebang line pointing to a wrapped Nix store interpreter.

structured function argument

: `script`

: Script loaded using loadScript

`python`

: Nixpkgs Python interpreter

`environ`

: Nixpkgs Python package set Python extras (optional-dependencies) to enable. PEP-508 environment

::: {.example #function-library-example-lib.scripts.renderWithPackages}

    # Using renderWithPackages directly
    let
      script = loadScript { script = ./with-inline-metadata.py; };
    in pkgs.writeScript script.name (renderWithPackages { inherit script; python = pkgs.python3; })
    
    # Using script render function
    let
      script = loadScript { script = ./with-inline-metadata.py; };
    in pkgs.writeScript script.name (script.render { python = pkgs.python3; })
    

:::

Pyproject.nix can be used with nixpkgs `buildPythonPackage`/`packageOverrides`/`withPackages`, but also implements its [own build infrastructure](https://pyproject-nix.github.io/pyproject.nix/build.html)
 that fixes many structural problems with the nixpkgs implementation.

**Type**: `withPackages :: AttrSet -> lambda`

Renders a project as an argument that can be passed to withPackages

Evaluates PEP-508 environment markers to select correct dependencies for the platform but does not validate version constraints. For validation see `lib.validators`.

structured function argument

: `project`

: Project metadata as returned by `lib.project.loadPyproject`

`python`

: Python derivation

`pythonPackages`

: Nixpkgs Python package set

`extras`

: Python extras (optionals) to enable

`groups`

: PEP-735 dependency groups to enable.

`extraPackages`

: Extra withPackages function

`environ`

: PEP-508 environment

::: {.example #function-library-example-lib.renderers.withPackages}

    # withPackages (lib.project.loadPyproject { ... })
      «lambda @ «string»:1:1»
    

:::

**Type**: `buildPythonPackage :: AttrSet -> AttrSet`

Renders a project as an argument that can be passed to buildPythonPackage/buildPythonApplication.

Evaluates PEP-508 environment markers to select correct dependencies for the platform but does not validate version constraints. For validation see `lib.validators`.

structured function argument

: `project`

: Project metadata as returned by `lib.project.loadPyproject`

`python`

: Python derivation

`pythonPackages`

: Nixpkgs Python package set

`extras`

: Python extras (optional-dependencies) to enable.

`groups`

: PEP-735 dependency groups to enable.

`extrasAttrMappings`

: Map a Python extras group name to a Nix attribute set like: { dev = "checkInputs"; } This is intended to be used with optionals such as test dependencies that you might want to remap to checkInputs.

`format`

: Which package format to pass to buildPythonPackage If the format is "wheel" PEP-518 build-systems are excluded from the build.

`environ`

: PEP-508 environment

::: {.example #function-library-example-lib.renderers.buildPythonPackage}

    # buildPythonPackage { project = lib.project.loadPyproject ...; python = pkgs.python3;  }
      { pname = "blinker"; version = "1.3.3.7"; dependencies = [ ]; }
    

:::

**Type**: `mkPythonEditablePackage :: AttrSet -> AttrSet`

Renders a project as an argument that can be passed to mkPythonEditablePackage.

Evaluates PEP-508 environment markers to select correct dependencies for the platform but does not validate version constraints. For validation see `lib.validators`.

Note for Nix Flake users: Flakes are copied to the store when using pure evaluation, meaning that the project root will point to a store directory. Either set root manually to a string using the returned attribute set, or evaluate using `--impure`.

::: {.example #function-library-example-lib.renderers.mkPythonEditablePackage}

    # mkPythonEditablePackage { project = lib.project.loadPyproject ...; python = pkgs.python3;  }
      { pname = "blinker"; version = "1.3.3.7"; dependencies = [ ]; }
    

:::

**Type**: `meta :: AttrSet -> AttrSet`

Renders a project as a meta attribute

This is used internally in renderers.mkPythonPackages

structured function argument

: `project`

: Function argument

**Type**: `validateVersionConstraints :: AttrSet -> AttrSet`

Validates the Python package set held by Python (`python.pkgs`) against the parsed project.

Returns an attribute set where the name is the Python package derivation `pname` and the value is a list of the mismatching conditions.

structured function argument

: `project`

: Project metadata as returned by `lib.project.loadPyproject`

`python`

: Python derivation

`extras`

: Python extras (optionals) to enable

::: {.example #function-library-example-lib.validators.validateVersionConstraints}

    # validateVersionConstraints (lib.project.loadPyproject { ... })
    {
      resolvelib = {
        # conditions as returned by `lib.pep440.parseVersionCond`
        conditions = [ { op = ">="; version = { dev = null; epoch = 0; local = null; post = null; pre = null; release = [ 1 0 1 ]; }; } ];
        # Version from Python package set
        version = "0.5.5";
      };
      unearth = {
        conditions = [ { op = ">="; version = { dev = null; epoch = 0; local = null; post = null; pre = null; release = [ 0 10 0 ]; }; } ];
        version = "0.9.1";
      };
    }
    

:::

The reference documentation is split up into two main categories:

*   User facing APIs

Contains high-level representations and has notions of things like a `project` (a fully parsed `pyproject.toml`) and further operations done on the project level.

*   Standards APIs

Contains parsers, evaluators & utility functions for dealing with Python packaging standards defined by the through the PEP process & from PyPA.

**Type**: `parseVersion :: string -> AttrSet`

Parse a version according to PEP-440.

`version`

: Function argument

::: {.example #function-library-example-lib.pep440.parseVersion}

    # parseVersion "3.0.0rc1"
    {
      dev = null;
      epoch = 0;
      local = null;
      post = null;
      pre = {
        type = "rc";
        value = 1;
      };
      release = [ 3 0 0 ];
    }
    

:::

**Type**: `parseVersionCond :: string -> AttrSet`

Parse a version conditional.

`cond`

: Function argument

::: {.example #function-library-example-lib.pep440.parseVersionCond}

    # parseVersionCond ">=3.0.0rc1"
    {
      op = ">=";
      version = {
        dev = null;
        epoch = 0;
        local = null;
        post = null;
        pre = {
          type = "rc";
          value = 1;
        };
        release = [ 3 0 0 ];
      };
    }
    

:::

**Type**: `parseVersionConds :: string -> [AttrSet]`

Parse a list of version conditionals separated by commas.

`conds`

: Function argument

::: {.example #function-library-example-lib.pep440.parseVersionConds}

    # parseVersionConds ">=3.0.0rc1,<=4.0"
    [\
      {\
        op = ">=";\
        version = {\
          dev = null;\
          epoch = 0;\
          local = null;\
          post = null;\
          pre = {\
            type = "rc";\
            value = 1;\
          };\
          release = [ 3 0 0 ];\
        };\
      }\
      {\
        op = "<=";\
        version = {\
          dev = null;\
          epoch = 0;\
          local = null;\
          post = null;\
          pre = null;\
          release = [ 4 0 ];\
        };\
      }\
    ]
    

:::

**Type**: `compareVersions :: AttrSet -> AttrSet -> int`

Compare two versions as parsed by `parseVersion` according to PEP-440.

Returns:

*   \-1 for less than
*   0 for equality
*   1 for greater than

`a`

: Function argument

`b`

: Function argument

::: {.example #function-library-example-lib.pep440.compareVersions}

    # compareVersions (parseVersion "3.0.0") (parseVersion "3.0.0")
    0
    

:::

**Type**: `operators.${operator} :: AttrSet -> AttrSet -> bool`

Map comparison operators as strings to a comparator function.

Attributes:

*   [Compatible release clause](https://peps.python.org/pep-0440/#compatible-release)
    : `~=`
*   [Version matching clause](https://peps.python.org/pep-0440/#version-matching)
    : `==`
*   [Version exclusion clause](https://peps.python.org/pep-0440/#version-exclusion)
    : `!=`
*   [Inclusive ordered comparison clause](https://peps.python.org/pep-0440/#inclusive-ordered-comparison)
    : `<=`, `>=`
*   [Exclusive ordered comparison clause](https://peps.python.org/pep-0440/#exclusive-ordered-comparison)
    : `<`, `>`
*   [Arbitrary equality clause](https://peps.python.org/pep-0440/#arbitrary-equality)
    : `===`

::: {.example #function-library-example-lib.pep440.comparators}

    # comparators."==" (parseVersion "3.0.0") (parseVersion "3.0.0")
    true
    

:::

**Type**: `parseMarkers :: string -> AttrSet`

Parse PEP 508 markers into an AST.

::: {.example #function-library-example-lib.pep508.parseMarkers}

    # parseMarkers "(os_name=='a' or os_name=='b') and os_name=='c'"
    {
      lhs = {
        lhs = {
          lhs = {
            type = "variable";
            value = "os_name";
          };
          op = "==";
          rhs = {
            type = "string";
            value = "a";
          };
          type = "compare";
        };
        op = "or";
        rhs = {
          lhs = {
            type = "variable";
            value = "os_name";
          };
          op = "==";
          rhs = {
            type = "string";
            value = "b";
          };
          type = "compare";
        };
        type = "boolOp";
      };
      op = "and";
      rhs = {
        lhs = {
          type = "variable";
          value = "os_name";
        };
        op = "==";
        rhs = {
          type = "string";
          value = "c";
        };
        type = "compare";
      };
      type = "boolOp";
    }
    

:::

**Type**: `parseString :: string -> AttrSet`

Parse a PEP-508 dependency string.

`input`

: Function argument

::: {.example #function-library-example-lib.pep508.parseString}

    # parseString "cachecontrol[filecache]>=0.13.0"
    {
      conditions = [\
        {\
          op = ">=";\
          version = {\
            dev = null;\
            epoch = 0;\
            local = null;\
            post = null;\
            pre = null;\
            release = [ 0 13 0 ];\
          };\
        }\
      ];
      markers = null;
      name = "cachecontrol";
      extras = [ "filecache" ];
      url = null;
    }
    

:::

**Type**: `mkEnviron :: derivation -> AttrSet`

Create an attrset of platform variables. As described in https://peps.python.org/pep-0508/#environment-markers.

`python`

: Function argument

::: {.example #function-library-example-lib.pep508.mkEnviron}

    # mkEnviron pkgs.python3
    {
      implementation_name = {
        type = "string";
        value = "cpython";
      };
      implementation_version = {
        type = "version";
        value = {
          dev = null;
          epoch = 0;
          local = null;
          post = null;
          pre = null;
          release = [ 3 10 12 ];
        };
      };
      os_name = {
        type = "string";
        value = "posix";
      };
      platform_machine = {
        type = "string";
        value = "x86_64";
      };
      platform_python_implementation = {
        type = "string";
        value = "CPython";
      };
      # platform_release maps to platform.release() which returns
      # the running kernel version on Linux.
      # Because this field is not reproducible it's left empty.
      platform_release = {
        type = "string";
        value = "";
      };
      platform_system = {
        type = "string";
        value = "Linux";
      };
      # platform_version maps to platform.version() which also returns
      # the running kernel version on Linux.
      # Because this field is not reproducible it's left empty.
      platform_version = {
        type = "version";
        value = {
          dev = null;
          epoch = 0;
          local = null;
          post = null;
          pre = null;
          release = [ ];
        };
      };
      python_full_version = {
        type = "version";
        value = {
          dev = null;
          epoch = 0;
          local = null;
          post = null;
          pre = null;
          release = [ 3 10 12 ];
        };
      };
      python_version = {
        type = "version";
        value = {
          dev = null;
          epoch = 0;
          local = null;
          post = null;
          pre = null;
          release = [ 3 10 ];
        };
      };
      sys_platform = {
        type = "string";
        value = "linux";
      };
    }
    

:::

Update one or more keys in an environment created by mkEnviron.

`environ`

: Function argument

`updates`

: Function argument

::: {.example #function-library-example-lib.pep508.setEnviron}

    # setEnviron (mkEnviron pkgs.python3) { platform_release = "5.10.65";  }
    

:::

**Type**: `evalMarkers :: AttrSet -> AttrSet -> bool`

Evaluate an environment as returned by `mkEnviron` against markers as returend by `parseMarkers`.

`environ`

: Function argument

`value`

: Function argument

::: {.example #function-library-example-lib.pep508.evalMarkers}

    # evalMarkers (mkEnviron pkgs.python3) (parseMarkers "python_version < \"3.11\"")
    true
    

:::

**Type**: `readPyproject :: AttrSet -> list`

Parse PEP-518 `build-system.requires` from pyproject.toml.

`pyproject`

: Function argument

::: {.example #function-library-example-lib.pep518.parseBuildSystems}

    # parseBuildSystems (lib.importTOML ./pyproject.toml)
      [ ]  # List of parsed PEP-508 strings as returned by `lib.pep508.parseString`.
    

:::

Map Nixpkgs CPU values to target machines known to be supported for manylinux\* wheels (a.k.a. `uname -m`), in nixpkgs found under the attribute `stdenv.targetPlatform.parsed.cpu.name`

::: {.example #function-library-example-lib.pep599.manyLinuxTargetMachines}

    # legacyAliases.powerpc64
    "ppc64"
    

:::

**Type**: `legacyAliases.${tag} :: AttrSet -> string`

Map legacy (pre PEP-600) platform tags to PEP-600 compliant ones.

https://peps.python.org/pep-0600/#legacy-manylinux-tags

::: {.example #function-library-example-lib.pep600.legacyAliases}

    # legacyAliases."manylinux1_x86_64" or "manylinux1_x86_64"
    "manylinux_2_5_x86_64"
    

:::

**Type**: `manyLinuxTagCompatible :: AttrSet -> derivation -> string -> bool`

Check if a manylinux tag is compatible with a given stdenv.

`platform`

: Platform attrset (`lib.systems.elaborate "x86_64-linux"`)

`libc`

: Libc derivation

`tag`

: Platform tag string

::: {.example #function-library-example-lib.pep600.manyLinuxTagCompatible}

    # manyLinuxTagCompatible pkgs.stdenv.targetPlatform pkgs.stdenv.cc.libc "manylinux_2_5_x86_64"
    true
    

:::

**Type**: `parseDependencies :: AttrSet -> AttrSet`

Parse dependencies from pyproject.toml.

structured function argument

: `pyproject`

: Function argument

`extrasAttrPaths`

: Function argument

`extrasListPaths`

: Function argument

`groupsAttrPaths`

: Function argument

`groupsListPaths`

: Function argument

::: {.example #function-library-example-lib.pep621.parseDependencies}

    # parseDependencies {
    #
    #   pyproject = (lib.importTOML ./pyproject.toml);
    #   # Don't just look at `project.optional-dependencies` for groups, also look at these:
    #   extrasAttrPaths = [ "tool.pdm.dev-dependencies" ];
    # }
    {
      dependencies = [ ];  # List of parsed PEP-508 strings (lib.pep508.parseString)
      extras = {
        dev = [ ];  # List of parsed PEP-508 strings (lib.pep508.parseString)
      };
      build-systems = [ ];  # PEP-518 build-systems (List of parsed PEP-508 strings)
    }
    

:::

**Type**: `parseRequiresPython :: AttrSet -> list`

Parse project.python-requires from pyproject.toml

`pyproject`

: Function argument

::: {.example #function-library-example-lib.pep621.parseRequiresPython}

    #  parseRequiresPython (lib.importTOML ./pyproject.toml)
    [ ]  # List of conditions as returned by `lib.pep440.parseVersionCond`
    

:::

**Type**: `filterDependenciesByEnviron :: AttrSet -> AttrSet -> AttrSet`

Filter dependencies not relevant for this environment.

`environ`

: Environ as created by `lib.pep508.mkEnviron`.

`extras`

: Extras as a list of strings

`dependencies`

: Dependencies as parsed by `lib.pep621.parseDependencies`.

::: {.example #function-library-example-lib.pep621.filterDependenciesByEnviron}

    # filterDependenciesByEnviron (lib.pep508.mkEnviron pkgs.python3) (lib.pep621.parseDependencies (lib.importTOML ./pyproject.toml))
    { }  # Structure omitted in docs
    

:::

**Type**: `muslLinuxTagCompatible :: AttrSet -> derivation -> string -> bool`

Check if a musllinux tag is compatible with a given stdenv.

`platform`

: Platform attrset (`lib.systems.elaborate "x86_64-linux"`)

`libc`

: Libc derivation

`tag`

: Platform tag string

::: {.example #function-library-example-lib.pep656.muslLinuxTagCompatible}

    # muslLinuxTagCompatible pkgs.stdenv.targetPlatform pkgs.stdenv.cc.libc "musllinux_1_1_x86_64"
    true
    

:::

**Type**: `parseScript :: string -> AttrSet`

Parse the script metadata section from a PEP-723 script.

`script`

: Function argument

::: {.example #function-library-example-lib.pep723.parseScript}

    # parseScript (readFile ./script.py)
    {
      requires-python = [ ];  # List of parsed version conditions (lib.pep440.parseVersionConds)
      dependencies = [ ];  # List of parsed PEP-508 strings (lib.pep508.parseString)
    }
    

:::

**Type**: `translatePoetryProject :: AttrSet -> lambda`

Translate a Pyproject.toml from Poetry to PEP-621 project metadata. This function transposes a PEP-621 project table on top of an existing Pyproject.toml populated with data from `tool.poetry`. Notably does not translate dependencies/optional-dependencies.

For parsing dependencies from Poetry see `lib.poetry.parseDependencies`.

`pyproject`

: Function argument

::: {.example #function-library-example-lib.poetry.translatePoetryProject}

    # translatePoetryProject (lib.importTOML ./pyproject.toml)
    { }  # TOML contents, structure omitted. See PEP-621 for more information on data members.
    

:::

**Type**: `parseDependencies :: AttrSet -> AttrSet`

Parse dependencies from pyproject.toml (Poetry edition). This function is analogous to `lib.pep621.parseDependencies`.

`pyproject`

: Function argument

::: {.example #function-library-example-lib.poetry.parseDependencies}

    # parseDependencies {
    #
    #   pyproject = (lib.importTOML ./pyproject.toml);
    # }
    {
      dependencies = [ ];  # List of parsed PEP-508 strings (lib.pep508.parseString)
      extras = {
        dev = [ ];  # List of parsed PEP-508 strings (lib.pep508.parseString)
      };
      build-systems = [ ];  # PEP-518 build-systems (List of parsed PEP-508 strings)
    }
    

:::

**Type**: `parseVersionCond :: string -> [ AttrSet ]`

Parse a version conditional. Supports additional non-standard operators `^` and `~` used by Poetry.

Because some expressions desugar to multiple expressions parseVersionCond returns a list.

`cond`

: Function argument

**Type**: `parseVersionConds :: string -> [ AttrSet ]`

Parse a comma separated list version conditionals. Supports additional non-standard operators `^` and `~` used by Poetry.

`s`

: Function argument

Normalize package name as documented in https://packaging.python.org/en/latest/specifications/name-normalization/#normalization

`string -> string`

    readPyproject "Friendly-Bard"
    ->
    "friendly-bard"
    

Parse Python tags.

As described in https://packaging.python.org/en/latest/specifications/platform-compatibility-tags/#python-tag.

Type: parsePythonTag :: string -> AttrSet

    parsePythonTag "cp37"
    ->
    {
      implementation = "cpython";
      version = "37";
    }
    

Parse ABI tags.

As described in https://packaging.python.org/en/latest/specifications/platform-compatibility-tags/#python-tag.

`string -> AttrSet`

    
    ## `lib.pypa.isSdistFileName` {#function-library-lib.pypa.isSdistFileName}
    
    Check whether string is a sdist file or not.
    
    ### Type
    `string -> bool`
    
    ### Example:
    ```nix
    isSdistFileName "cryptography-41.0.1.tar.gz"
    ->
    true
    

Regex match a wheel file name, returning a list of match groups. Returns null if no match.

`string -> [ string ]`

Check whether string is a wheel file or not.

`string -> bool`

    isWheelFileName "cryptography-41.0.1-cp37-abi3-manylinux_2_17_aarch64.manylinux2014_aarch64.whl"
    ->
    true
    

Parse PEP-427 wheel file names.

`string -> AttrSet`

    parseFileName "cryptography-41.0.1-cp37-abi3-manylinux_2_17_aarch64.manylinux2014_aarch64.whl"
    ->
    {
     abiTags = [ "abi3" ];
     buildTag = null;
     distribution = "cryptography";
     languageTags = [  # Parsed by pypa.parsePythonTag\
       {\
         implementation = "cpython";\
         version = "37";\
       }\
     ];
     platformTags = [ "manylinux_2_17_aarch64" "manylinux2014_aarch64" ];
     version = "41.0.1";
    }
    

Check whether an ABI tag is compatible with this python interpreter.

`derivation -> string -> bool`

    isABITagCompatible pkgs.python3 (pypa.parseABITag "cp37")
    ->
    true
    

Check whether a platform tag is compatible with this python interpreter.

`AttrSet -> derivation -> string -> bool`

    isPlatformTagCompatible pkgs.python3 "manylinux2014_x86_64"
    ->
    true
    

Check whether a Python language tag is compatible with this Python interpreter.

`derivation -> AttrSet -> bool`

    isPythonTagCompatible pkgs.python3 (pypa.parsePythonTag "py3")
    ->
    true
    

Check whether wheel file name is compatible with this python interpreter.

`derivation -> AttrSet -> bool`

    isWheelFileCompatible pkgs.python3 (pypa.parseWheelFileName "Pillow-9.0.1-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl")
    ->
    true
    

Select compatible wheels from a list and return them in priority order.

`AttrSet -> derivation -> [ AttrSet ] -> [ AttrSet ]`

    selectWheels (lib.systems.elaborate "x86_64-linux") [ (pypa.parseWheelFileName "Pillow-9.0.1-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl") ]
    ->
    [ (pypa.parseWheelFileName "Pillow-9.0.1-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl") ]
    

**Type**: `matchEggFileName :: string -> [ string ]`

Regex match an egg file name, returning a list of match groups. Returns null if no match.

`name`

: Function argument

**Type**: `isEggFileName :: string -> bool`

Check whether string is an egg file or not.

`name`

: The filename string

::: {.example #function-library-example-lib.eggs.isEggFileName}

    # isEggFileName "cryptography-41.0.1-cp37-abi3-manylinux_2_17_aarch64.manylinux2014_aarch64.whl"
    false
    

:::

**Type**: `parsehEggFileName :: string -> AttrSet`

Parse an egg file name.

`name`

: Function argument

::: {.example #function-library-example-lib.eggs.parseEggFileName}

    # parseEggFileName
    

:::

**Type**: `selectEggs :: derivation -> [ AttrSet ] -> [ AttrSet ]`

Select compatible eggs from a list and return them in priority order.

`python`

: Python interpreter derivation

`files`

: List of files parsed by parseEggFileName

**Type**: `parseRequirementsTxt :: AttrSet -> list`

Parse dependencies from requirements.txt

`requirements`

: The contents of or path to requirements.txt

::: {.example #function-library-example-lib.pip.parseRequirementsTxt}

    # parseRequirements ./requirements.txt
    [ { flags = []; requirement = {}; # Returned by pep508.parseString } ]
    

:::

**Type**: `mkDerivation :: AttrSet -> AttrSet`

Renders a project as an argument that can be passed to stdenv.mkDerivation.

Evaluates PEP-508 environment markers to select correct dependencies for the platform but does not validate version constraints.

structured function argument

: `project`

: Loaded pyproject.nix project

`environ`

: PEP-508 environment

`extras`

: Extras to enable (markers only, `optional-dependencies` are not enabled by default)

**Type**: `mkDerivation :: AttrSet -> AttrSet`

Renders a project as an argument that can be passed to stdenv.mkDerivation.

Evaluates PEP-508 environment markers to select correct dependencies for the platform but does not validate version constraints.

structured function argument

: `project`

: Loaded pyproject.nix project

`environ`

: PEP-508 environment

`extras`

: Extras to enable (markers only, `optional-dependencies` are not enabled by default)

`root`

: Editable root directory as a string

Resolve dependencies using a non-circular supporting approach.

This implementation is faster than the one supporting circular dependencies, and is memoized.

`resolveNonCyclic` is intended to resolve build-system dependencies.

`memoNames`

: List of package names to memoize

`set`

: Package set to resolve packages from

Resolve dependencies using a cyclic supporting approach.

`resolveCyclic` is intended to resolve virtualenv dependencies.

`set`

: Package set to resolve packages from

`spec`

: Attribute set of dependencies -> extras `{ requests = [ "socks" ]; }`

The query API is still experimental and subject to change.

Query a package set for a dependency specification to pass to `mkVirtualEnv`.

Returns a specification with _only_ the dependencies of packages, not the queried packages themselves.

This is useful for example if you want to construct a virtualenv with development dependencies for a package, but without containing the package itself.

    query.deps { } pythonSet {
      hello-world = [ "dev" ];
    }
    =>
    {
      urllib3 = [ ]; # From project.dependencies
      ruff = [ ]; # From the `dev` group
    }
    

customisations : Query customisations (whether to include project.dependencies or not)

pythonSet : Python package set

specification : Dependency specifications in the form used by mkVirtualEnv

Create a virtual environment from dependency specification

    mkVirtualEnv "foo-env" {
      foo = [ "extra" ];
    }
    

    (mkVirtualEnv "foo-env" {
      foo = [ "extra" ];
    }).overrideAttrs(old: {
      # Skip LICENSE file from package root.
      venvSkip = [ "LICENSE" ];
    })
    

    (mkVirtualEnv "foo-env" {
      foo = [ "extra" ];
    }).overrideAttrs(old: {
      # You could also ignore all collisions with:
      # venvIgnoreCollisions = [ "*" ];
      venvIgnoreCollisions = [ "lib/python${python.pythonVersion}/site-packages/build_tools" ];
    })
    

`name`

: Venv name

`spec`

: Dependency specification

Undo any `$PYTHONPATH` changes done by nixpkgs Python infrastructure dependency propagation.

Used internally by `pyprojectHook`.

Build a pyproject.toml/setuptools project.

Used internally by `pyprojectHook`.

Symlink prebuilt wheel sources.

Used internally by `pyprojectWheelHook`.

Install built projects from dist/\*.whl.

Used internally by `pyprojectHook`.

Create `pyproject.nix` setup hook in package output.

Used internally by `pyprojectHook`.

Rewrite shebangs for cross compiled Python programs.

When cross compiling & installing a Python program the shebang gets written for the install-time Pythhon, which for cross compilation is for the _build host_.

This hook rewrites any shebangs pointing to the build host Python to the target host Python.

Create a virtual environment from buildInputs

Used internally by `mkVirtualEnv`.

Meta hook aggregating the default pyproject.toml/setup.py install behaviour and adds Python.

This is the default choice for both pyproject.toml & setuptools projects.

Hook used to build prebuilt wheels.

Use instead of pyprojectHook.

Hook used to build editable packages.

Use instead of pyprojectHook.

Build an editable package .

Fixup path references in an editable package .

Install hook using pypa/installer.

Used instead of `pyprojectInstallHook` for cross compilation support.

Install dist directory with wheels into output .

Hook used to build a wheel file and install it into the output directory.

Use instead of pyprojectHook.

Use a package output built by Nixpkgs Python infrastructure.

Adapts a package by:

*   Stripping dependency propagation
*   Throwing away shell script wrapping
*   Filtering out sys.path dependency injection

This adaptation will of course break anything depending on other packages by `$PATH`, as these are injected by wrappers.

    nixpkgsPrebuilt {
      from = pkgs.python3Packages.torchWithoutCuda;
      prev = prev.torch;
    }
    =>
    «derivation /nix/store/3864g3951bkbkq5nrld5yd8jxq7ss72y-torch-2.4.1.drv»
    

    nixpkgsPrebuilt :: AttrSet -> derivation
    

from : Prebuilt package to transform output from

prev : Previous pyproject.nix package to take passthru from

Build a Cargo (Rust) package using rustPlatform.importCargoLock to fetch Rust dependencies.

Uses IFD (import-from-derivation) on non-local packages.

    importCargoLock {
      prev = prev.cryptography;
      # Lock file relative to source root
      lockFile = "src/rust/Cargo.lock";
    }
    =>
    «derivation /nix/store/g3z1zlmc0sqpd6d5ccfrx3c4w4nv5dzr-cryptography-43.0.0.drv»
    

    importCargoLock :: AttrSet -> derivation
    

prev : Previous pyproject.nix package

importCargoLockArgs : Arguments passed directly to `rustPlatform.importCargoLock` function

cargoRoot : Path to Cargo source root

lockFile : Path to Cargo.lock (defaults to `${cargoRoot}/Cargo.lock`)

doUnpack : Whether to unpack sources using an intermediate derivation

unpackDerivationArgs : Arguments passed directly to intermediate unpacker derivation (unused for path sources)

cargo : cargo derivation

rustc : rustc derivation

pkg-config : pkg-config derivation

Create a nixpkgs Python (buildPythonPackage) compatible package from a pyproject.nix build package.

Adapts a package by:

*   Activating a wheel output, if not already enabled
*   Create a package using generated wheel as input

Note: toNixpkgs is still experimental and subject to change.

    toNixpkgs {
      inherit pythonSet;
      packages = [ "requests" ];
    }
    =>
    «lambda @ /nix/store/f05hjk9fh1m5py5j1ixzly07p4lla56x-source/build/hacks/default.nix:263:5»
    

    nixpkgsPrebuilt :: AttrSet -> derivation
    

pythonSet : Pyproject.nix build Python package set

packages : List/predicate of overlay member packages

Build applications without venv cruft.

Virtual environments contains many files that are not relevant when distributing applications. This includes, but is not limited to

*   Python interpreter
*   Activation scripts
*   `pyvenv.cfg`

This helper creates a new derivation, only symlinking venv files relevant for the application.

    util.mkApplication {
      venv = pythonSet.mkVirtualEnv "mkApplication-check-venv" {
        pip = [ ];
      }
      package = pythonSet.pip;
    }
    =>
    «derivation /nix/store/i60rydd6sagcgrsz9cx0la30djzpa8k9-pip-24.0.drv»
    

    mkApplication :: AttrSet -> derivation
    

venv : Virtualenv derivation created using `mkVirtualEnv`

package : Python set package

This document outlines hacking on `pyproject.nix` itself, and lays out its project structure.

To start hacking run `nix develop -c hivemind` to run the project in watch mode.

This will start up two processes:

*   A [Nix-unit](https://github.com/adisbladis/nix-unit)
     test runner
*   A [documentation server](https://rust-lang.github.io/mdBook/)
     available at http://localhost:3000

All Nix code lives in `lib/`. Each file has an implementation and a test suite. The attribute path to a an attribute `parseVersion` in `lib/pep440.nix` would be `lib.pep440.parseVersion`.

A function in `lib/test.nix` maps over the public interface of the library and the test suite to generate coverage tests, ensuring that every exported symbol has at least one test covering it.

Integration tests meaning tests that perform environment constructions & builds lives in `test/` and are exposed through Flake checks.

The manual you are reading right now is built from the `doc/` directory. To edit a specific page see the "Edit this page on GitHub" link in the footer for each respective page.

*   Run the entire unit test suite `$ nix-unit --flake .#libTests`
    
*   Run unit tests for an individual function `$ nix-unit --flake .#libTests.pep440.parseVersion`
    
*   Run integration tests `$ nix flake check`
    

Before submitting a PR format the code with `nix fmt` and ensure Flake checks pass with `nix flake check`.

Commercial support for the `pyproject.nix` ecosystem is offered by [Bladis Limited](https://blad.is/consulting/)
.

---

# Conflicts support - uv2nix

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Uv exposes internally generated package markers(1), therefore uv2nix support for conflicts is limited and may have incorrect marker(2) evaluation results.

Uv has support for creating mutually exclusive groups of [conflicting dependencies](https://docs.astral.sh/uv/concepts/projects/config/#conflicting-dependencies)
.

To use conflicting dependencies with uv2nix you have to tell it which conflict resolution to take when creating the package overlay:

`workspace.mkPyprojectOverlay {   sourcePreference = "wheel";   dependencies = {     hello-world = [ "extra1" ];   }; }`

1.  [Uv pull request #4339](https://github.com/astral-sh/uv/pull/4339)
    
2.  [PEP-508 environment markers](https://packaging.python.org/en/latest/specifications/dependency-specifiers/#environment-markers)

---

# Using meta - uv2nix

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uv2nix
======

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[](https://github.com/pyproject-nix/uv2nix "Git repository")

`uv2nix` primarily builds [_virtual environments_](https://docs.python.org/3/library/venv.html)
, not individual applications.

Virtual environment derivations have no concept of what their "main" binary is, meaning that a call like `lib.getExe` or a command like `nix run` won't know what is considered the main program.

To supplement `meta` fields in virtualenv derivations add an override:

``{     # Expose Python virtual environments as packages.     packages = forAllSystems (       system:       let         pythonSet = pythonSets.${system};          # Add metadata attributes to the virtual environment.         # This is useful to inject meta and other attributes onto the virtual environment derivation.         #         # See         # - https://nixos.org/manual/nixpkgs/unstable/#chap-passthru         # - https://nixos.org/manual/nixpkgs/unstable/#chap-meta         addMeta =           drv:           drv.overrideAttrs (old: {             # Pass through tests from our package into the virtualenv so they can be discovered externally.             passthru = lib.recursiveUpdate (old.passthru or { }) {               inherit (pythonSet.testing.passthru) tests;             };              # Set meta.mainProgram for commands like `nix run`.             # https://nixos.org/manual/nixpkgs/stable/#var-meta-mainProgram             meta = (old.meta or { }) // {               mainProgram = "hello";             };           });        in       {         default = addMeta (pythonSet.mkVirtualEnv "testing-env" workspace.deps.default);         full = addMeta (pythonSet.mkVirtualEnv "testing-env-full" workspace.deps.all);       } }``

---

# Patching packages - uv2nix

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uv2nix
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[](https://github.com/pyproject-nix/uv2nix "Git repository")

With uv2nix, you can apply patches to your Python dependencies.

Use this superpower judiciously: if you're building a Python library, you probably don't want to apply patches to your dependencies that users of your library would also somehow have to apply.

This overlay applies a patch to the `arpeggio` library.

`arpeggio.patch`:

`--- /dev/null +++ b/arpeggio/patched.py @@ -0,0 +1 @@ +print("You have patched arpeggio. Congratulations!")`

Note how the overlay forces us to build from sdist, which requires specifying the build system. See [Overriding build systems](https://pyproject-nix.github.io/uv2nix/patterns/overriding-build-systems.html)
 for more details.

``final: prev: {   arpeggio =     (prev.arpeggio.override {       # We build from sdist (not a wheel) to apply a patch to the source       # code.       # Alternatively, if you're using a wheel, you could apply patches to the       # Python code in `postInstall`/`postFixup`, but YMMV.       sourcePreference = "sdist";     }).overrideAttrs       (old: {         patches = (old.patches or [ ]) ++ [           ./arpeggio.patch         ];          nativeBuildInputs = old.nativeBuildInputs ++ [           (final.resolveBuildSystem {             setuptools = [ ];           })         ];       }); }``

---

# Inline script metadata - uv2nix

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uv2nix
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[](https://github.com/pyproject-nix/uv2nix "Git repository")

Uv supports [locking dependencies](https://docs.astral.sh/uv/guides/scripts/#locking-dependencies)
 for [inline metadata](https://packaging.python.org/en/latest/specifications/inline-script-metadata/#inline-script-metadata)
 scripts.

This example shows you how to set up a `uv2nix` from a directory of locked scripts.

It has the following features:

*   Creating one Python package set per script from `${script}.py.lock`
    
*   Build each script with `nix build .#script`
    
*   Run each script with `nix run .#script`
    

``{   description = "Use PEP-723 inline metadata scripts with uv2nix";    inputs = {     nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";      pyproject-nix = {       url = "github:pyproject-nix/pyproject.nix";       inputs.nixpkgs.follows = "nixpkgs";     };      uv2nix = {       url = "github:pyproject-nix/uv2nix";       inputs.pyproject-nix.follows = "pyproject-nix";       inputs.nixpkgs.follows = "nixpkgs";     };      pyproject-build-systems = {       url = "github:pyproject-nix/build-system-pkgs";       inputs.pyproject-nix.follows = "pyproject-nix";       inputs.uv2nix.follows = "uv2nix";       inputs.nixpkgs.follows = "nixpkgs";     };   };    outputs =     {       self,       nixpkgs,       uv2nix,       pyproject-nix,       pyproject-build-systems,       ...     }:     let       inherit (nixpkgs) lib;       forAllSystems = lib.genAttrs lib.systems.flakeExposed;        # Load all Python scripts from ./scripts directory       scripts =         lib.mapAttrs           (             name: _:             uv2nix.lib.scripts.loadScript {               script = ./scripts + "/${name}";             }           )           (             lib.filterAttrs (name: type: type == "regular" && lib.hasSuffix ".py" name) (               builtins.readDir ./scripts             )           );        packages' = forAllSystems (         system:         let           pkgs = nixpkgs.legacyPackages.${system};           python = pkgs.python3;           baseSet = pkgs.callPackage pyproject-nix.build.packages {             inherit python;           };         in         lib.mapAttrs (           _name: script:           let             # Create package overlay from script             overlay = script.mkOverlay {               sourcePreference = "wheel";             };              # Construct package set             pythonSet = baseSet.overrideScope (               lib.composeManyExtensions [                 pyproject-build-systems.overlays.wheel                 overlay               ]             );           in           # Write out an executable script with a shebang pointing to the scripts virtualenv           pkgs.writeScript script.name (             # Returns script as a string with inserted shebang             script.renderScript {               # Construct a virtual environment for script               venv = script.mkVirtualEnv {                 inherit pythonSet;               };             }           )         ) scripts       );      in     {       # Drop .py suffix from scripts, making example.py runnable as example       packages = forAllSystems (         system:         lib.mapAttrs' (name: drv: lib.nameValuePair (lib.removeSuffix ".py" name) drv) packages'.${system}       );        # Make each script runnable directly with `nix run`       apps = forAllSystems (         system:         lib.mapAttrs (_name: script: {           type = "app";           program = "${script}";         }) self.packages.${system}       );     }; }``

`# /// script # requires-python = ">=3.12" # dependencies = [ #   "tqdm", # ] # ///  from tqdm import tqdm  for i in tqdm(range(10000)):     pass`

---

# FAQ - uv2nix

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uv2nix
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[](https://github.com/pyproject-nix/uv2nix "Git repository")

`uv2nix` can only work with what it has, and `uv.lock` metadata is notably absent of important metadata.

For more details see [overriding](https://pyproject-nix.github.io/uv2nix/overriding/index.html)
.

Users coming from [poetry2nix](https://github.com/nix-community/poetry2nix)
 may be surprised to find that uv2nix doesn't come with any bundled overrides.

Overrides are required because Python tooling is lacking important metadata, complexity which surfaces when using Nix. Uv2nix focuses on getting the translation from `pyproject.toml` & `uv.lock` to Nix right, without trying to taper over deficiencies in metadata.

In poetry2nix much of the requirement of overriding came from it's choice to build sdist's by default. uv2nix doesn't have a default package source preference, instead requiring users to make that choice. Binary wheels are much more likely to "just work", making it feasible to use uv2nix without an overrides collection at all. Maintaining overrides was the [biggest source of maintainer burnout for poetry2nix](https://github.com/nix-community/poetry2nix/issues/1865#issue-2640023203)
.

Users will either have to maintain their own set of overrides, or use a third-party override collection.

---

# hacks - Pyproject.nix

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Pyproject.nix
=============

[](https://pyproject-nix.github.io/pyproject.nix/print.html "Print this book")
[](https://github.com/pyproject-nix/pyproject.nix "Git repository")

Use a package output built by Nixpkgs Python infrastructure.

Adapts a package by:

*   Stripping dependency propagation
*   Throwing away shell script wrapping
*   Filtering out sys.path dependency injection

This adaptation will of course break anything depending on other packages by `$PATH`, as these are injected by wrappers.

`nixpkgsPrebuilt {   from = pkgs.python3Packages.torchWithoutCuda;   prev = prev.torch; } => «derivation /nix/store/3864g3951bkbkq5nrld5yd8jxq7ss72y-torch-2.4.1.drv»`

`nixpkgsPrebuilt :: AttrSet -> derivation`

from : Prebuilt package to transform output from

prev : Previous pyproject.nix package to take passthru from

Build a Cargo (Rust) package using rustPlatform.importCargoLock to fetch Rust dependencies.

Uses IFD (import-from-derivation) on non-local packages.

`importCargoLock {   prev = prev.cryptography;   # Lock file relative to source root   lockFile = "src/rust/Cargo.lock"; } => «derivation /nix/store/g3z1zlmc0sqpd6d5ccfrx3c4w4nv5dzr-cryptography-43.0.0.drv»`

`importCargoLock :: AttrSet -> derivation`

prev : Previous pyproject.nix package

importCargoLockArgs : Arguments passed directly to `rustPlatform.importCargoLock` function

cargoRoot : Path to Cargo source root

lockFile : Path to Cargo.lock (defaults to `${cargoRoot}/Cargo.lock`)

doUnpack : Whether to unpack sources using an intermediate derivation

unpackDerivationArgs : Arguments passed directly to intermediate unpacker derivation (unused for path sources)

cargo : cargo derivation

rustc : rustc derivation

pkg-config : pkg-config derivation

Create a nixpkgs Python (buildPythonPackage) compatible package from a pyproject.nix build package.

Adapts a package by:

*   Activating a wheel output, if not already enabled
*   Create a package using generated wheel as input

Note: toNixpkgs is still experimental and subject to change.

`toNixpkgs {   inherit pythonSet;   packages = [ "requests" ]; } => «lambda @ /nix/store/f05hjk9fh1m5py5j1ixzly07p4lla56x-source/build/hacks/default.nix:263:5»`

`nixpkgsPrebuilt :: AttrSet -> derivation`

pythonSet : Pyproject.nix build Python package set

packages : List/predicate of overlay member packages

---

# Cross compilation - uv2nix

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When cross compiling build systems needs to be overriden _twice_. Once for the _build host_ and once for the _target host_

`let   pyprojectOverrides = final: prev: {     hatchling = prev.hatchling.overrideAttrs (old: {       nativeBuildInputs =         old.nativeBuildInputs         ++ final.resolveBuildSystem {           pathspec = [ ];         };     });   };  in pythonSet.overrideScope (   lib.composeExtensions (_final: prev: {     pythonPkgsBuildHost = prev.pythonPkgsBuildHost.overrideScope pyprojectOverrides;   }) pyprojectOverrides )`

`final: prev: {    foobar = prev.foobar.overrideAttrs (old: {     nativeBuildInputs = old.nativeBuildInputs ++ [       final.pkgs.buildPackages.cmake     ];      buildInputs = (old.buildInputs or [ ]) ++ [ final.pkgs.ncurses ];   });  }`

---

# packages - Pyproject.nix

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Pyproject.nix
=============

[](https://pyproject-nix.github.io/pyproject.nix/print.html "Print this book")
[](https://github.com/pyproject-nix/pyproject.nix "Git repository")

`pyproject.nix`'s base package set only contains the scaffolding for a Python package set, but no actual Python packages.

`# Returns a scope with base packages. pkgs.callPackage pyproject-nix.build.packages {   python = interpreter; }`

For package managers that lack the ability to solve build-system dependencies `pyproject.nix` maintains a [base package set](https://github.com/pyproject-nix/build-system-pkgs)
. This set is much smaller and more narrow in scope than nixpkgs, its purpose is only to package [build-system](https://peps.python.org/pep-0518/)
 dependencies, which are missing from Python package manager lock files, so needs to be supplemented from elsewhere.

See the [nixpkgs documentation](https://nixos.org/manual/nixpkgs/stable/#function-library-lib.customisation.makeScope)
.

---

# pyproject.toml - Pyproject.nix

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Pyproject.nix
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It's possible to develop [PEP-621](https://peps.python.org/pep-0621/)
 compliant Python projects without using _any_ Python package manager except Nix.

This example loads `pyproject.toml` to create an environment using [`python.withPackages`](https://nixos.org/manual/nixpkgs/stable/#user-guide)
 and a consumable package using `python.pkgs.buildPythonPackage`.

``{   description = "A basic flake using pyproject.toml project metadata";    inputs.pyproject-nix.url = "github:pyproject-nix/pyproject.nix";   inputs.pyproject-nix.inputs.nixpkgs.follows = "nixpkgs";    outputs =     { nixpkgs, pyproject-nix, ... }:     let       # Loads pyproject.toml into a high-level project representation       # Do you notice how this is not tied to any `system` attribute or package sets?       # That is because `project` refers to a pure data representation.       project = pyproject-nix.lib.project.loadPyproject {         # Read & unmarshal pyproject.toml relative to this project root.         # projectRoot is also used to set `src` for renderers such as buildPythonPackage.         projectRoot = ./.;       };        # This example is only using x86_64-linux       pkgs = nixpkgs.legacyPackages.x86_64-linux;        # We are using the default nixpkgs Python3 interpreter & package set.       #       # This means that you are purposefully ignoring:       # - Version bounds       # - Dependency sources (meaning local path dependencies won't resolve to the local path)       #       # To use packages from local sources see "Overriding Python packages" in the nixpkgs manual:       # https://nixos.org/manual/nixpkgs/stable/#reference       #       # Or use an overlay generator such as uv2nix:       # https://github.com/pyproject-nix/uv2nix       python = pkgs.python3;      in     {       # Create a development shell containing dependencies from `pyproject.toml`       devShells.x86_64-linux.default =         let           # Returns a function that can be passed to `python.withPackages`           arg = project.renderers.withPackages { inherit python; };            # Returns a wrapped environment (virtualenv like) with all our packages           pythonEnv = python.withPackages arg;          in         # Create a devShell like normal.         pkgs.mkShell { packages = [ pythonEnv ]; };        # Build our package using `buildPythonPackage       packages.x86_64-linux.default =         let           # Returns an attribute set that can be passed to `buildPythonPackage`.           attrs = project.renderers.buildPythonPackage { inherit python; };         in         # Pass attributes to buildPythonPackage.         # Here is a good spot to add on any missing or custom attributes.         python.pkgs.buildPythonPackage (attrs // { env.CUSTOM_ENVVAR = "hello"; });     }; }``

`[project] name = "hello-python" version = "0.1.0" description = "A minimal pyproject.toml" authors = [ ] requires-python = ">=3.13" dependencies = []`

---

# project - Pyproject.nix

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Pyproject.nix
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**Type**: `loadPyproject :: AttrSet -> AttrSet`

Load dependencies from a PEP-621 pyproject.toml.

structured function argument

: `pyproject`

: The unmarshaled contents of pyproject.toml

`extrasAttrPaths`

: Example: extrasAttrPaths = \[ "tool.pdm.dev-dependencies" \];

`extrasListPaths`

: Example: extrasListPaths = { "tool.uv.dependencies.dev-dependencies" = "dev-dependencies"; }

`groupsAttrPaths`

: Example: extrasAttrPaths = \[ "tool.pdm.dev-dependencies" \];

`groupsListPaths`

: Example: extrasListPaths = { "tool.uv.dependencies.dev-dependencies" = "dev-dependencies"; }

`projectRoot`

: Path to project root

::: {.example #function-library-example-lib.project.loadPyproject}

``# loadPyproject { pyproject = lib.importTOML } {   dependencies = { }; # Parsed dependency structure in the schema of `lib.pep621.parseDependencies`   build-systems = [ ];  # Returned by `lib.pep518.parseBuildSystems`   pyproject = { }; # The unmarshaled contents of pyproject.toml   projectRoot = null; # Path to project root   requires-python = null; # requires-python as parsed by pep621.parseRequiresPython }``

:::

**Type**: `loadUVPyproject :: AttrSet -> AttrSet`

Load dependencies from a uv pyproject.toml.

structured function argument

: `pyproject`

: The unmarshaled contents of pyproject.toml

`projectRoot`

: Path to project root

::: {.example #function-library-example-lib.project.loadUVPyproject}

``# loadUVPyproject { projectRoot = ./.; } {   dependencies = { }; # Parsed dependency structure in the schema of `lib.pep621.parseDependencies`   build-systems = [ ];  # Returned by `lib.pep518.parseBuildSystems`   pyproject = { }; # The unmarshaled contents of pyproject.toml   projectRoot = null; # Path to project root   requires-python = null; # requires-python as parsed by pep621.parseRequiresPython }``

:::

**Type**: `loadPDMPyproject :: AttrSet -> AttrSet`

Load dependencies from a PDM pyproject.toml.

structured function argument

: `pyproject`

: The unmarshaled contents of pyproject.toml

`projectRoot`

: Path to project root

::: {.example #function-library-example-lib.project.loadPDMPyproject}

``# loadPyproject { projectRoot = ./.; } {   dependencies = { }; # Parsed dependency structure in the schema of `lib.pep621.parseDependencies`   build-systems = [ ];  # Returned by `lib.pep518.parseBuildSystems`   pyproject = { }; # The unmarshaled contents of pyproject.toml   projectRoot = null; # Path to project root   requires-python = null; # requires-python as parsed by pep621.parseRequiresPython }``

:::

**Type**: `loadPoetryPyproject :: AttrSet -> AttrSet`

Load dependencies from a Poetry pyproject.toml.

structured function argument

: `pyproject`

: The unmarshaled contents of pyproject.toml

`projectRoot`

: Path to project root

::: {.example #function-library-example-lib.project.loadPoetryPyproject}

``# loadPoetryPyproject { projectRoot = ./.; } {   dependencies = { }; # Parsed dependency structure in the schema of `lib.pep621.parseDependencies`   build-systems = [ ];  # Returned by `lib.pep518.parseBuildSystems`   pyproject = { }; # The unmarshaled contents of pyproject.toml   projectRoot = null; # Path to project root   requires-python = null; # requires-python as parsed by pep621.parseRequiresPython }``

:::

**Type**: `loadRequirementsTxt :: AttrSet -> AttrSet`

Load dependencies from a requirements.txt.

Note that as requirements.txt is lacking important project metadata this is incompatible with some renderers.

structured function argument

: `requirements`

: The contents of requirements.txt

`projectRoot`

: Path to project root

::: {.example #function-library-example-lib.project.loadRequirementsTxt}

``# loadRequirementstxt { requirements = builtins.readFile ./requirements.txt; projectRoot = ./.; } {   dependencies = { }; # Parsed dependency structure in the schema of `lib.pep621.parseDependencies`   build-systems = [ ];  # Returned by `lib.pep518.parseBuildSystems`   pyproject = null; # The unmarshaled contents of pyproject.toml   projectRoot = null; # Path to project root   requires-python = null; # requires-python as parsed by pep621.parseRequiresPython }``

:::

**Type**: `loadPyprojectDynamic :: AttrSet -> AttrSet`

Load dependencies from a either a PEP-621 or Poetry pyproject.toml file. This function is intended for 2nix authors that wants to include local pyproject.toml files but don't know up front whether they're from Poetry or PEP-621.

structured function argument

: `pyproject`

: The unmarshaled contents of pyproject.toml

`projectRoot`

: Path to project root

::: {.example #function-library-example-lib.project.loadPyprojectDynamic}

``# loadPyprojectDynamic { projectRoot = ./.; } {   dependencies = { }; # Parsed dependency structure in the schema of `lib.pep621.parseDependencies`   build-systems = [ ];  # Returned by `lib.pep518.parseBuildSystems`   pyproject = { }; # The unmarshaled contents of pyproject.toml   projectRoot = null; # Path to project root   requires-python = null; # requires-python as parsed by pep621.parseRequiresPython }``

:::

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# ecosystem - Pyproject.nix

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Projects currently using the `pyproject.nix` builders

Lock file consumers producing package sets

*   [uv2nix](https://github.com/pyproject-nix/uv2nix)
    

*   [build-system-pkgs](https://github.com/pyproject-nix/build-system-pkgs)
    

Override collections to deal with packaging issues

*   [uv2nix\_hammer\_overrides](https://github.com/TyberiusPrime/uv2nix_hammer_overrides/)

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# pep518 - Pyproject.nix

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**Type**: `readPyproject :: AttrSet -> list`

Parse PEP-518 `build-system.requires` from pyproject.toml.

`pyproject`

: Function argument

::: {.example #function-library-example-lib.pep518.parseBuildSystems}

``# parseBuildSystems (lib.importTOML ./pyproject.toml)   [ ]  # List of parsed PEP-508 strings as returned by `lib.pep508.parseString`.``

:::

---

# Testing - uv2nix

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uv2nix
======

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[](https://github.com/pyproject-nix/uv2nix "Git repository")

`uv2nix` uses the [`pyproject.nix` build infrastructure](https://pyproject-nix.github.io/pyproject.nix/build.html)
.

Unlike the nixpkgs, runtime & test dependencies are not available at build time. Tests should instead be implemented as separate derivations.

This usage pattern shows how to:

*   Overriding a package adding tests to `passthru.tests`
*   Using `passthru.tests` in Flake checks

`{   description = "Pytest flake using uv2nix";    inputs = {     nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";      pyproject-nix = {       url = "github:pyproject-nix/pyproject.nix";       inputs.nixpkgs.follows = "nixpkgs";     };      uv2nix = {       url = "github:pyproject-nix/uv2nix";       inputs.pyproject-nix.follows = "pyproject-nix";       inputs.nixpkgs.follows = "nixpkgs";     };      pyproject-build-systems = {       url = "github:pyproject-nix/build-system-pkgs";       inputs.pyproject-nix.follows = "pyproject-nix";       inputs.uv2nix.follows = "uv2nix";       inputs.nixpkgs.follows = "nixpkgs";     };   };    outputs =     {       nixpkgs,       uv2nix,       pyproject-nix,       pyproject-build-systems,       ...     }:     let       inherit (nixpkgs) lib;        forAllSystems = lib.genAttrs lib.systems.flakeExposed;        workspace = uv2nix.lib.workspace.loadWorkspace { workspaceRoot = ./.; };        overlay = workspace.mkPyprojectOverlay {         sourcePreference = "wheel";       };        # Python sets grouped per system       pythonSets = forAllSystems (         system:         let           pkgs = nixpkgs.legacyPackages.${system};           inherit (pkgs) stdenv;            baseSet = pkgs.callPackage pyproject-nix.build.packages {             python = pkgs.python312;           };            # An overlay of build fixups & test additions.           pyprojectOverrides = final: prev: {              # testing is the name of our example package             testing = prev.testing.overrideAttrs (old: {                passthru = old.passthru // {                 # Put all tests in the passthru.tests attribute set.                 # Nixpkgs also uses the passthru.tests mechanism for ofborg test discovery.                 #                 # For usage with Flakes we will refer to the passthru.tests attributes to construct the flake checks attribute set.                 tests =                   let                     # Construct a virtual environment with only the test dependency-group enabled for testing.                     virtualenv = final.mkVirtualEnv "testing-pytest-env" {                       testing = [ "test" ];                     };                    in                   (old.tests or { })                   // {                     pytest = stdenv.mkDerivation {                       name = "${final.testing.name}-pytest";                       inherit (final.testing) src;                       nativeBuildInputs = [                         virtualenv                       ];                       dontConfigure = true;                        # Because this package is running tests, and not actually building the main package                       # the build phase is running the tests.                       #                       # In this particular example we also output a HTML coverage report, which is used as the build output.                       buildPhase = ''                         runHook preBuild                         pytest --cov tests --cov-report html                         runHook postBuild                       '';                        # Install the HTML coverage report into the build output.                       #                       # If you wanted to install multiple test output formats such as TAP outputs                       # you could make this derivation a multiple-output derivation.                       #                       # See https://nixos.org/manual/nixpkgs/stable/#chap-multiple-output for more information on multiple outputs.                       installPhase = ''                         runHook preInstall                         mv htmlcov $out                         runHook postInstall                       '';                     };                    };               };             });           };          in         baseSet.overrideScope (           lib.composeManyExtensions [             pyproject-build-systems.overlays.default             overlay             pyprojectOverrides           ]         )       );      in     {       # Construct flake checks from Python set       checks = forAllSystems (         system:         let           pythonSet = pythonSets.${system};         in         {           inherit (pythonSet.testing.passthru.tests) pytest;         }       );     }; }`

`[project] name = "testing" version = "0.1.0" description = "Add your description here" requires-python = ">=3.12"  [project.scripts] hello = "testing:hello"  [build-system] requires = ["hatchling"] build-backend = "hatchling.build"  [dependency-groups] dev = [   "ruff>=0.7.2",   {include-group = "test"} ] test = [   "pytest-cov>=6.0.0",   "pytest>=8.3.3", ]`

---

# pep440 - Pyproject.nix

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**Type**: `parseVersion :: string -> AttrSet`

Parse a version according to PEP-440.

`version`

: Function argument

::: {.example #function-library-example-lib.pep440.parseVersion}

`# parseVersion "3.0.0rc1" {   dev = null;   epoch = 0;   local = null;   post = null;   pre = {     type = "rc";     value = 1;   };   release = [ 3 0 0 ]; }`

:::

**Type**: `parseVersionCond :: string -> AttrSet`

Parse a version conditional.

`cond`

: Function argument

::: {.example #function-library-example-lib.pep440.parseVersionCond}

`# parseVersionCond ">=3.0.0rc1" {   op = ">=";   version = {     dev = null;     epoch = 0;     local = null;     post = null;     pre = {       type = "rc";       value = 1;     };     release = [ 3 0 0 ];   }; }`

:::

**Type**: `parseVersionConds :: string -> [AttrSet]`

Parse a list of version conditionals separated by commas.

`conds`

: Function argument

::: {.example #function-library-example-lib.pep440.parseVersionConds}

`# parseVersionConds ">=3.0.0rc1,<=4.0" [   {     op = ">=";     version = {       dev = null;       epoch = 0;       local = null;       post = null;       pre = {         type = "rc";         value = 1;       };       release = [ 3 0 0 ];     };   }   {     op = "<=";     version = {       dev = null;       epoch = 0;       local = null;       post = null;       pre = null;       release = [ 4 0 ];     };   } ]`

:::

**Type**: `compareVersions :: AttrSet -> AttrSet -> int`

Compare two versions as parsed by `parseVersion` according to PEP-440.

Returns:

*   \-1 for less than
*   0 for equality
*   1 for greater than

`a`

: Function argument

`b`

: Function argument

::: {.example #function-library-example-lib.pep440.compareVersions}

`# compareVersions (parseVersion "3.0.0") (parseVersion "3.0.0") 0`

:::

**Type**: `operators.${operator} :: AttrSet -> AttrSet -> bool`

Map comparison operators as strings to a comparator function.

Attributes:

*   [Compatible release clause](https://peps.python.org/pep-0440/#compatible-release)
    : `~=`
*   [Version matching clause](https://peps.python.org/pep-0440/#version-matching)
    : `==`
*   [Version exclusion clause](https://peps.python.org/pep-0440/#version-exclusion)
    : `!=`
*   [Inclusive ordered comparison clause](https://peps.python.org/pep-0440/#inclusive-ordered-comparison)
    : `<=`, `>=`
*   [Exclusive ordered comparison clause](https://peps.python.org/pep-0440/#exclusive-ordered-comparison)
    : `<`, `>`
*   [Arbitrary equality clause](https://peps.python.org/pep-0440/#arbitrary-equality)
    : `===`

::: {.example #function-library-example-lib.pep440.comparators}

`# comparators."==" (parseVersion "3.0.0") (parseVersion "3.0.0") true`

:::

---

# validators - Pyproject.nix

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**Type**: `validateVersionConstraints :: AttrSet -> AttrSet`

Validates the Python package set held by Python (`python.pkgs`) against the parsed project.

Returns an attribute set where the name is the Python package derivation `pname` and the value is a list of the mismatching conditions.

structured function argument

: `project`

: Project metadata as returned by `lib.project.loadPyproject`

`python`

: Python derivation

`extras`

: Python extras (optionals) to enable

::: {.example #function-library-example-lib.validators.validateVersionConstraints}

``# validateVersionConstraints (lib.project.loadPyproject { ... }) {   resolvelib = {     # conditions as returned by `lib.pep440.parseVersionCond`     conditions = [ { op = ">="; version = { dev = null; epoch = 0; local = null; post = null; pre = null; release = [ 1 0 1 ]; }; } ];     # Version from Python package set     version = "0.5.5";   };   unearth = {     conditions = [ { op = ">="; version = { dev = null; epoch = 0; local = null; post = null; pre = null; release = [ 0 10 0 ]; }; } ];     version = "0.9.1";   }; }``

:::

---

# renderers - Pyproject.nix

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**Type**: `withPackages :: AttrSet -> lambda`

Renders a project as an argument that can be passed to withPackages

Evaluates PEP-508 environment markers to select correct dependencies for the platform but does not validate version constraints. For validation see `lib.validators`.

structured function argument

: `project`

: Project metadata as returned by `lib.project.loadPyproject`

`python`

: Python derivation

`pythonPackages`

: Nixpkgs Python package set

`extras`

: Python extras (optionals) to enable

`groups`

: PEP-735 dependency groups to enable.

`extraPackages`

: Extra withPackages function

`environ`

: PEP-508 environment

::: {.example #function-library-example-lib.renderers.withPackages}

`# withPackages (lib.project.loadPyproject { ... })   «lambda @ «string»:1:1»`

:::

**Type**: `buildPythonPackage :: AttrSet -> AttrSet`

Renders a project as an argument that can be passed to buildPythonPackage/buildPythonApplication.

Evaluates PEP-508 environment markers to select correct dependencies for the platform but does not validate version constraints. For validation see `lib.validators`.

structured function argument

: `project`

: Project metadata as returned by `lib.project.loadPyproject`

`python`

: Python derivation

`pythonPackages`

: Nixpkgs Python package set

`extras`

: Python extras (optional-dependencies) to enable.

`groups`

: PEP-735 dependency groups to enable.

`extrasAttrMappings`

: Map a Python extras group name to a Nix attribute set like: { dev = "checkInputs"; } This is intended to be used with optionals such as test dependencies that you might want to remap to checkInputs.

`format`

: Which package format to pass to buildPythonPackage If the format is "wheel" PEP-518 build-systems are excluded from the build.

`environ`

: PEP-508 environment

::: {.example #function-library-example-lib.renderers.buildPythonPackage}

`# buildPythonPackage { project = lib.project.loadPyproject ...; python = pkgs.python3;  }   { pname = "blinker"; version = "1.3.3.7"; dependencies = [ ]; }`

:::

**Type**: `mkPythonEditablePackage :: AttrSet -> AttrSet`

Renders a project as an argument that can be passed to mkPythonEditablePackage.

Evaluates PEP-508 environment markers to select correct dependencies for the platform but does not validate version constraints. For validation see `lib.validators`.

Note for Nix Flake users: Flakes are copied to the store when using pure evaluation, meaning that the project root will point to a store directory. Either set root manually to a string using the returned attribute set, or evaluate using `--impure`.

::: {.example #function-library-example-lib.renderers.mkPythonEditablePackage}

`# mkPythonEditablePackage { project = lib.project.loadPyproject ...; python = pkgs.python3;  }   { pname = "blinker"; version = "1.3.3.7"; dependencies = [ ]; }`

:::

**Type**: `meta :: AttrSet -> AttrSet`

Renders a project as a meta attribute

This is used internally in renderers.mkPythonPackages

structured function argument

: `project`

: Function argument

---

# Introduction - Pyproject.nix

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Pyproject.nix
=============

[](https://pyproject-nix.github.io/pyproject.nix/print.html "Print this book")
[](https://github.com/pyproject-nix/pyproject.nix "Git repository")

Pyproject.nix is a collection of Nix utilities to work with Python project metadata in [Nix](https://nixos.org/)
. It mainly targets [PEP-621](https://peps.python.org/pep-0621/)
 compliant `pyproject.toml` files and data formats, but also implement support for other & legacy formats such as [Poetry](https://python-poetry.org/)
 & `requirements.txt`.

Pyproject.nix aims to be a swiss army knife of simple customizable utilities that works either together with the [nixpkgs Python infrastructure](https://nixos.org/manual/nixpkgs/stable/#python)
, or [our own build infrastructure](https://pyproject-nix.github.io/pyproject.nix/build.html)
.

This documentation only helps you to get started with `pyproject.nix`. As it's a toolkit with many use cases not every use case can be documented fully.

First and foremost `pyproject.nix` is a _Python metadata toolkit_, and not a 2nix tool.

This documentation is centered around packaging Python applications & managing development environments. For other use cases see the reference documentation.

`pyproject.nix` introduces a few high level abstract concepts. The best way to get started is to understand these concepts and how they fit together.

### [Project](https://pyproject-nix.github.io/pyproject.nix/lib/project.html)

A `project` attribute set is a high-level representation of a project that includes:

*   The parsed `pyproject.toml` file
*   Parsed dependencies
*   Project root directory

It can can be loaded from many different sources:

*   PEP-621 `pyproject.toml`
*   PEP-621 `pyproject.toml` with PDM extensions
*   Poetry `pyproject.toml`
*   `requirements.txt`

### [Validators](https://pyproject-nix.github.io/pyproject.nix/lib/validators.html)

Validators work on dependency constraints as defined in a `project` and offers validation for them. This can be useful to check that a package set is compliant with the specification.

### [Renderers](https://pyproject-nix.github.io/pyproject.nix/lib/renderers.html)

A `renderer` takes a `project` together with a Python interpreter derivation and renders it into a form understood by various pieces of Python infrastructure.

For example: The `buildPythonPackage` renderer returns an attribute set that can be passed to either nixpkgs function `buildPythonPackage` or `buildPythonApplication`.

There might be information missing from what a renderer returned depending on what can be computed from the `project`. If any attributes are missing you can manually merge your own attribute set with what the renderer returned.

For a concrete example use see [Use cases -> pyproject.toml](https://pyproject-nix.github.io/pyproject.nix/use-cases/pyproject.html)
.

---

# Development scripts - uv2nix

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uv2nix
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It's common to have development scripts that you don't want to publish in a Python package, but that you might want to run ergonomically from Nix.

This pattern shows how to:

*   Take a directory of development scripts (`examples/`)
*   Wrap the scripts in a virtualenv
*   Make scripts runnable using `nix run`

`{   description = "Using Nix Flake apps to run scripts with uv2nix";    inputs = {     nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";      pyproject-nix = {       url = "github:pyproject-nix/pyproject.nix";       inputs.nixpkgs.follows = "nixpkgs";     };      uv2nix = {       url = "github:pyproject-nix/uv2nix";       inputs.pyproject-nix.follows = "pyproject-nix";       inputs.nixpkgs.follows = "nixpkgs";     };      pyproject-build-systems = {       url = "github:pyproject-nix/build-system-pkgs";       inputs.pyproject-nix.follows = "pyproject-nix";       inputs.uv2nix.follows = "uv2nix";       inputs.nixpkgs.follows = "nixpkgs";     };   };    outputs =     {       nixpkgs,       uv2nix,       pyproject-nix,       pyproject-build-systems,       ...     }:     let       inherit (nixpkgs) lib;       inherit (lib) filterAttrs hasSuffix;        workspace = uv2nix.lib.workspace.loadWorkspace { workspaceRoot = ./.; };        overlay = workspace.mkPyprojectOverlay {         sourcePreference = "wheel"; # or sourcePreference = "sdist";       };        pkgs = nixpkgs.legacyPackages.x86_64-linux;        python = pkgs.python312;        pythonSet =         (pkgs.callPackage pyproject-nix.build.packages {           inherit python;         }).overrideScope           (             lib.composeManyExtensions [               pyproject-build-systems.overlays.default               overlay             ]           );        venv = pythonSet.mkVirtualEnv "development-scripts-default-env" workspace.deps.default;     in     {        apps.x86_64-linux =         let           # Example base directory           basedir = ./examples;            # Get a list of regular Python files in example directory           files = filterAttrs (name: type: type == "regular" && hasSuffix ".py" name) (             builtins.readDir basedir           );          in         # Map over files to:         # - Rewrite script shebangs as shebangs pointing to the virtualenv         # - Strip .py suffixes from attribute names         #   Making a script "greet.py" runnable as "nix run .#greet"         lib.mapAttrs' (           name: _:           lib.nameValuePair (lib.removeSuffix ".py" name) (             let               script = basedir + "/${name}";                # Patch script shebang               program = pkgs.runCommand name { buildInputs = [ venv ]; } ''                 cp ${script} $out                 chmod +x $out                 patchShebangs $out               '';             in             {               type = "app";               program = "${program}";             }           )         ) files;      }; }`

---

# Installation - Pyproject.nix

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Pyproject.nix
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Documentation examples in `pyproject.nix` are using Flakes for the convenience of grouping multiple concepts into a single file.

You can just as easily import `pyproject.nix` without using Flakes:

`let   pkgs = import <nixpkgs> { };   inherit (pkgs) lib;    pyproject-nix = import (builtins.fetchGit {     url = "https://github.com/pyproject-nix/pyproject.nix.git";   }) {     inherit lib;   };  in ...`

See [use-cases/pyproject.toml](https://pyproject-nix.github.io/pyproject.nix/use-cases/pyproject.html)
.

---

# Private packages - uv2nix

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uv2nix
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[](https://github.com/pyproject-nix/uv2nix "Git repository")

Uv2nix uses [pkgs.fetchurl](https://nixos.org/manual/nixpkgs/stable/#sec-pkgs-fetchers-fetchurl)
 for fetching from PyPI, and inherits authentication support from nixpkgs.

Getting authentication running in the sandbox requires some system setup.

`[project] name = "with-private-deps" version = "0.1.0" requires-python = ">=3.12" dependencies = ["iniconfig"]  [[tool.uv.index]] name = "my-index" url = "https://pypi-proxy.fly.dev/basic-auth/simple" explicit = true  [tool.uv.sources] iniconfig = { index = "my-index" }  [build-system] requires = ["setuptools>=42"] build-backend = "setuptools.build_meta"`

[netrc](https://everything.curl.dev/usingcurl/netrc.html)
 file
---------------------------------------------------------------

In this documentation we assume that the netrc file is saved as `/etc/nix/netrc`.

`machine pypi-proxy.fly.dev login public password heron`

To use this netrc file inside our development shell run:

`$ export NETRC=/etc/nix/netrc`

While `pkgs.fetchurl` can use a netrc file, it won't do so by default. We'll need to override our authenticated package's `src` attribute to use our provided file.

`let   pyprojectOverrides = _final: prev: {     iniconfig = prev.iniconfig.overrideAttrs(old: {       src = old.src.overrideAttrs(_: {         # Make curl use our netrc file.         curlOpts = "--netrc-file /etc/nix/netrc";         # By default pkgs.fetchurl will fetch _without_ TLS verification for reproducibility.         # Since we are transferring credentials we want to verify certificates.         SSL_CERT_FILE = "${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt";       });     });   }; in ...`

To build a package we need to provide our netrc file _inside_ the Nix sandbox.

`nix build -L -v --option extra-sandbox-paths /etc/nix/netrc`

For a persistent setup `extra-sandbox-paths` should be added to `nix.conf`.

---

# Installing nixpkgs packages - uv2nix

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In some cases a package isn't published on PyPI, but is packaged in nixpkgs, or you might be struggling trying to figure out the overrides to build a particular package. In such cases it's possible to use Python packages from nixpkgs through an interoperability layer.

We are using the `seccomp` package for demonstration here, which is not available on PyPI.

By using [`UV_FIND_LINKS`](https://docs.astral.sh/uv/configuration/environment/#uv_find_links)
 and a `shellHook` we can install the nixpkgs built wheel, making it possible to use both impure (uv managed) workflows & pure uv2nix managed workflows.

`let   python = pkgs.python3;    uv-links = pkgs.symlinkJoin {     name = "uv-links";     paths = [       # Note: Using the dist output which contains a wheel       python.pkgs.seccomp.dist     ];   };  in mkShell {   packages = [ pkgs.uv python ];   shellHook = ''     ln -sfn ${uv-links} .uv-links     export UV_FIND_LINKS=$(realpath -s .uv-links)   ''; }`

To be able to read the sources from a Flake evaluation you will also have to override the `seccomp` package sources, as `.uv-links` is not added to Git.

`let   pyprojectOverrides = final: prev: {     seccomp = prev.seccomp.overrideAttrs(old: {       buildInputs = (old.buildInputs or []) ++ python.pkgs.seccomp.buildInputs;       src = python.pkgs.seccomp.dist;     });   }; in ...`

[pyproject.nix hacks](https://pyproject-nix.github.io/pyproject.nix/builders/hacks.html#using-prebuilt-packages-from-nixpkgs)

------------------------------------------------------------------------------------------------------------------------------

It's also possible to skip making uv aware of the package and only add the nixpkgs package from a Nix evaluation.

`let   pyprojectOverrides = final: prev: {     seccomp = hacks.nixpkgsPrebuilt {       from = python.pkgs.seccomp;     };   };    pythonSet' = pythonSet.overrideScope pyprojectOverrides; in   pythonSet.mkVirtualEnv "seccomp-env" {     seccomp = [ ];   }`

---

# Flake Templates - Pyproject.nix

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Pyproject.nix offers a number of Flake templates to quickly get started with developing

To get started with any of the listed templates run (replace `name` with the template name):

Using nixpkgs for Python development based on a PEP-621 `pyproject.toml` file. A quickstart & production version of [use-cases/pyproject](https://pyproject-nix.github.io/pyproject.nix/use-cases/pyproject.html)
.

`nix flake init --template github:pyproject-nix/pyproject.nix#pyproject`

Use a `requirements.txt` to create a Python environment using nixpkgs Python packages. A quickstart & production version of [use-cases/requirements](https://pyproject-nix.github.io/pyproject.nix/use-cases/requirements.html)
.

`nix flake init --template github:pyproject-nix/pyproject.nix#requirements`

Simple no frills best practices development shell to develop Python projects with Nix, but without using Nix tooling for Python packages.

Does not depend on `pyproject.nix`.

Uses `uv` for Python package management.

`nix flake init --template github:pyproject-nix/pyproject.nix#impure`

---

# FAQ - Pyproject.nix

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Package names are normalized according to the [PyPA normalization specification](https://packaging.python.org/en/latest/specifications/name-normalization/#normalization)
. Nixpkgs also uses the same normalization [but has some legacy package names](https://github.com/NixOS/nixpkgs/issues/245383)
 that do not follow normalization guidelines.

The other case where the automatic mapping goes wrong is when the Nixpkgs `python.pkgs` set does not contain a dependency. One such example is `ruff`, a Python linter written in Rust.

Nixpkgs has `ruff` on the top-level (`pkgs`), but not in `python3.pkgs`. In such cases you can use an overlay to add the package to the Python set:

`let   python = pkgs.python3.override {     packageOverrides = self: super: {       ruff = pkgs.ruff;     };   }; in ...`

Pyproject.nix makes no attempt at parsing dynamic fields as it does not have the required knowledge to infer these.

When using the `withPackages` renderer most fields that may be dynamic are not even relevant and won't cause issues. At other times, like when using the `buildPythonPackage` renderer problems occur as there is no way for the renderer to create the version attribute.

`let   project = pyproject.project.loadPyproject { pyproject = lib.importTOML ./pyproject.toml; };   python = pkgs.python3;   attrs = pyproject.renderers.buildPythonPackage { inherit python project; }; in python.pkgs.buildPythonPackage attrs`

Will result in an error from `buildPythonpackage` because `version` is missing:

`error: attribute 'version' missing  at /nix/store/gna8i238i3nnz6cizcayyfyfdzn28la5-nixpkgs/pkgs/development/interpreters/python/mk-python-derivation.nix:31:28:      30|     31| { name ? "${attrs.pname}-${attrs.version}"       |                            ^     32|`

In these cases you can manually add attributes to the attribute set returned by the renderer:

`let   project = pyproject.project.loadPyproject { pyproject = lib.importTOML ./pyproject.toml; };   python = pkgs.python3;   attrs = pyproject.renderers.buildPythonPackage { inherit python project; }; in python.pkgs.buildPythonPackage (attrs // {   version = "1.0";  # Not dynamically inferred })`

---

# User facing APIs - Pyproject.nix

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=============

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[](https://github.com/pyproject-nix/pyproject.nix "Git repository")

The reference documentation is split up into two main categories:

*   User facing APIs

Contains high-level representations and has notions of things like a `project` (a fully parsed `pyproject.toml`) and further operations done on the project level.

*   Standards APIs

Contains parsers, evaluators & utility functions for dealing with Python packaging standards defined by the through the PEP process & from PyPA.

---

# Building wheels/sdists - uv2nix

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As a part of building a Python package `uv2nix` builds a wheel which is installed into the Nix store. The intermediate wheel file is normally discarded once the build is complete and the wheel has been installed into it's Nix store prefix.

Using [multiple outputs](https://nixos.org/manual/nixpkgs/stable/#chap-multiple-output)
 allows us to not only perform our regular install steps, but also to install the wheel files into a separate output. To add a separate dist output:

`pythonSet.hello-world.override (old: {   outputs = [ "out" dist" ]; })`

This will install the produced wheel into the build output directory of the `dist` output, producing the same contents as a `uv build` would produce in `dist/`.

To augment the install behaviour to install the produced wheel into the Nix store output by overriding our package:

`pythonSet.hello-world.override {   pyprojectHook = pythonSet.pyprojectDistHook; }`

This will install the produced wheel into the build output directory, producing the same contents as a `uv build` would produce in `dist/`. Note that this method will not perform the regular `pyproject.nix` install steps, making the output unsuitable for usage with `mkVirtualEnv`.

Because of the risk of Nix store path references ending up in the wheel file via references to shared libraries & other Nix/nixpkgs specific behaviour the outputs are scanned for Nix store path references, and the build will fail if any are found.

By default `pyproject.nix`'s builders will produce a wheel.

If you want to distribute an sdist instead override `uvBuildType`:

`(pythonSet.hello-world.override {   pyprojectHook = pythonSet.pyprojectDistHook; }).overrideAttrs(old: {   env.uvBuildType = "sdist"; })`

---

# workspace - uv2nix

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Load a workspace from a workspace root

`workspaceRoot`: Workspace root as a path

`config`: Config overrides for settings automatically inferred by `loadConfig`

Can be passed as either:

*   An attribute set
*   A function taking the generated config as an argument, and returning the augmented config

*   `mkPyprojectOverlay`: Create an overlay for usage with pyproject.nix's builders
*   `mkEditablePyprojectOverlay`: Generate an overlay to use with pyproject.nix's build infrastructure to install dependencies in editable mode.
*   `config`: Workspace config as loaded by `loadConfig`
*   `deps`: Pre-defined dependency declarations for top-level workspace packages
    *   `default`: No optional-dependencies or dependency-groups enabled
    *   `optionals`: All optional-dependencies enabled
    *   `groups`: All dependency-groups enabled
    *   `all`: All optional-dependencies & dependency-groups enabled

Load supported configuration from workspace

Supports:

*   tool.uv.no-binary
*   tool.uv.no-build
*   tool.uv.no-binary-package
*   tool.uv.no-build-package

Discover workspace member directories from a workspace root. Returns a list of strings relative to the workspace root.

structured function argument

: `workspaceRoot`

: Workspace root directory

`pyproject`

: Workspace top-level pyproject.toml

---

# lock1 - uv2nix

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Resolve dependencies from uv.lock .

structured function argument

: `lock`

: Lock file as parsed by parseLock

`environ`

: PEP-508 environment as returned by pyproject-nix.lib.pep508.mkEnviron

`dependencies`

: List of dependency names to start resolution from

Check if a package is a local package. .

`package`

: Function argument

Get relative path for a local package .

`package`

: Function argument

Filter dependencies/optional-dependencies/dev-dependencies from a uv.lock package entry .

`environ`

: Function argument

Filter package conflicts from lock according to dependency specification.

This function exists to filter uv.lock _before_ being passed to resolveDependencies, allowing the runtime solver to treat the lock as if no conflicts exists.

structured function argument

: `lock`

: Function argument

`spec`

: Function argument

Parse unmarshaled uv.lock .

Parse a package entry from uv.lock .

---

# overlays - uv2nix

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Generate an overlay to use with pyproject.nix's build infrastructure.

See https://pyproject-nix.github.io/pyproject.nix/lib/build.html

structured function argument

: `sourcePreference`

: Whether to prefer sources from either: - wheel - sdist See FAQ for more information.

`environ`

: PEP-508 environment customisations. Example: { platform\_release = "5.10.65"; }

`spec`

: Dependency specification used for conflict resolution. By default mkPyprojectOverlay resolves the entire workspace, but that will not work for resolutions with conflicts.

`localProjects`

: Local projects loaded from lock1.loadLocalPackages

`config`

: Workspace config

`workspaceRoot`

: Workspace root

`lock`

: Lock parsed by lock1.parseLock

---

# scripts - Pyproject.nix

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Load a PEP-723 metadata script from file path or string.

structured function argument

: `name`

: Function argument

`script`

: Function argument

::: {.example #function-library-example-lib.scripts.loadScript}

`# loadScript { script = ./with-inline-metadata.py; } {   name = "with-inline-metadata";   metadata = { ... }; # Contains dependencies and requires-python   renderWithPackages = { python }: ...; # renderWithPackages with loaded script pre-applied }`

:::

Render a loaded PEP-723 script as a string with a shebang line pointing to a wrapped Nix store interpreter.

structured function argument

: `script`

: Script loaded using loadScript

`python`

: Nixpkgs Python interpreter

`environ`

: Nixpkgs Python package set Python extras (optional-dependencies) to enable. PEP-508 environment

::: {.example #function-library-example-lib.scripts.renderWithPackages}

`# Using renderWithPackages directly let   script = loadScript { script = ./with-inline-metadata.py; }; in pkgs.writeScript script.name (renderWithPackages { inherit script; python = pkgs.python3; })  # Using script render function let   script = loadScript { script = ./with-inline-metadata.py; }; in pkgs.writeScript script.name (script.render { python = pkgs.python3; })`

:::

---

# nixpkgs - Pyproject.nix

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Pyproject.nix can be used with nixpkgs `buildPythonPackage`/`packageOverrides`/`withPackages`, but also implements its [own build infrastructure](https://pyproject-nix.github.io/pyproject.nix/build.html)
 that fixes many structural problems with the nixpkgs implementation.

---

# Hacking - uv2nix

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======

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[](https://github.com/pyproject-nix/uv2nix "Git repository")

This document outlines hacking on `uv2nix` itself, and lays out it's project structure.

All Nix code lives in `lib/`. Each file has an implementation and a test suite. The attribute path to a an attribute `mkOverlay` in `lib/lock.nix` would be `lib.lock.mkOverlay`.

A function in `lib/test.nix` maps over the public interface of the library and the test suite to generate coverage tests, ensuring that every exported symbol has at least one test covering it.

Integration tests meaning tests that perform environment constructions & builds lives in `test/` and are exposed through Flake checks.

The manual you are reading right now is built from the `doc/` directory. To edit a specific page see the "Edit this page on GitHub" link in the footer for each respective page.

*   Run the entire unit test suite `$ nix-unit --flake .#libTests`
    
*   Run unit tests for an individual function \`$ nix-unit --flake .#libTests.lock.mkOverlay
    
*   Run integration tests `$ nix flake check`
    

Before submitting a PR format the code with `nix fmt` and ensure Flake checks pass with `nix flake check`.

---

# Standards APIs - Pyproject.nix

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=============

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[](https://github.com/pyproject-nix/pyproject.nix "Git repository")

The reference documentation is split up into two main categories:

*   User facing APIs

Contains high-level representations and has notions of things like a `project` (a fully parsed `pyproject.toml`) and further operations done on the project level.

*   Standards APIs

Contains parsers, evaluators & utility functions for dealing with Python packaging standards defined by the through the PEP process & from PyPA.

---

# pep599 - Pyproject.nix

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Map Nixpkgs CPU values to target machines known to be supported for manylinux\* wheels (a.k.a. `uname -m`), in nixpkgs found under the attribute `stdenv.targetPlatform.parsed.cpu.name`

::: {.example #function-library-example-lib.pep599.manyLinuxTargetMachines}

`# legacyAliases.powerpc64 "ppc64"`

:::

---

# Support - uv2nix

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======

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Commercial support for the `pyproject.nix` ecosystem is offered by [Bladis Limited](https://blad.is/consulting/)
.

---

# pep600 - Pyproject.nix

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**Type**: `legacyAliases.${tag} :: AttrSet -> string`

Map legacy (pre PEP-600) platform tags to PEP-600 compliant ones.

https://peps.python.org/pep-0600/#legacy-manylinux-tags

::: {.example #function-library-example-lib.pep600.legacyAliases}

`# legacyAliases."manylinux1_x86_64" or "manylinux1_x86_64" "manylinux_2_5_x86_64"`

:::

**Type**: `manyLinuxTagCompatible :: AttrSet -> derivation -> string -> bool`

Check if a manylinux tag is compatible with a given stdenv.

`platform`

: Platform attrset (`lib.systems.elaborate "x86_64-linux"`)

`libc`

: Libc derivation

`tag`

: Platform tag string

::: {.example #function-library-example-lib.pep600.manyLinuxTagCompatible}

`# manyLinuxTagCompatible pkgs.stdenv.targetPlatform pkgs.stdenv.cc.libc "manylinux_2_5_x86_64" true`

:::

---

# pep656 - Pyproject.nix

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**Type**: `muslLinuxTagCompatible :: AttrSet -> derivation -> string -> bool`

Check if a musllinux tag is compatible with a given stdenv.

`platform`

: Platform attrset (`lib.systems.elaborate "x86_64-linux"`)

`libc`

: Libc derivation

`tag`

: Platform tag string

::: {.example #function-library-example-lib.pep656.muslLinuxTagCompatible}

`# muslLinuxTagCompatible pkgs.stdenv.targetPlatform pkgs.stdenv.cc.libc "musllinux_1_1_x86_64" true`

:::

---

# poetry - Pyproject.nix

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**Type**: `translatePoetryProject :: AttrSet -> lambda`

Translate a Pyproject.toml from Poetry to PEP-621 project metadata. This function transposes a PEP-621 project table on top of an existing Pyproject.toml populated with data from `tool.poetry`. Notably does not translate dependencies/optional-dependencies.

For parsing dependencies from Poetry see `lib.poetry.parseDependencies`.

`pyproject`

: Function argument

::: {.example #function-library-example-lib.poetry.translatePoetryProject}

`# translatePoetryProject (lib.importTOML ./pyproject.toml) { }  # TOML contents, structure omitted. See PEP-621 for more information on data members.`

:::

**Type**: `parseDependencies :: AttrSet -> AttrSet`

Parse dependencies from pyproject.toml (Poetry edition). This function is analogous to `lib.pep621.parseDependencies`.

`pyproject`

: Function argument

::: {.example #function-library-example-lib.poetry.parseDependencies}

`# parseDependencies { # #   pyproject = (lib.importTOML ./pyproject.toml); # } {   dependencies = [ ];  # List of parsed PEP-508 strings (lib.pep508.parseString)   extras = {     dev = [ ];  # List of parsed PEP-508 strings (lib.pep508.parseString)   };   build-systems = [ ];  # PEP-518 build-systems (List of parsed PEP-508 strings) }`

:::

**Type**: `parseVersionCond :: string -> [ AttrSet ]`

Parse a version conditional. Supports additional non-standard operators `^` and `~` used by Poetry.

Because some expressions desugar to multiple expressions parseVersionCond returns a list.

`cond`

: Function argument

**Type**: `parseVersionConds :: string -> [ AttrSet ]`

Parse a comma separated list version conditionals. Supports additional non-standard operators `^` and `~` used by Poetry.

`s`

: Function argument

---

# pep621 - Pyproject.nix

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**Type**: `parseDependencies :: AttrSet -> AttrSet`

Parse dependencies from pyproject.toml.

structured function argument

: `pyproject`

: Function argument

`extrasAttrPaths`

: Function argument

`extrasListPaths`

: Function argument

`groupsAttrPaths`

: Function argument

`groupsListPaths`

: Function argument

::: {.example #function-library-example-lib.pep621.parseDependencies}

``# parseDependencies { # #   pyproject = (lib.importTOML ./pyproject.toml); #   # Don't just look at `project.optional-dependencies` for groups, also look at these: #   extrasAttrPaths = [ "tool.pdm.dev-dependencies" ]; # } {   dependencies = [ ];  # List of parsed PEP-508 strings (lib.pep508.parseString)   extras = {     dev = [ ];  # List of parsed PEP-508 strings (lib.pep508.parseString)   };   build-systems = [ ];  # PEP-518 build-systems (List of parsed PEP-508 strings) }``

:::

**Type**: `parseRequiresPython :: AttrSet -> list`

Parse project.python-requires from pyproject.toml

`pyproject`

: Function argument

::: {.example #function-library-example-lib.pep621.parseRequiresPython}

`` #  parseRequiresPython (lib.importTOML ./pyproject.toml) [ ]  # List of conditions as returned by `lib.pep440.parseVersionCond` ``

:::

**Type**: `filterDependenciesByEnviron :: AttrSet -> AttrSet -> AttrSet`

Filter dependencies not relevant for this environment.

`environ`

: Environ as created by `lib.pep508.mkEnviron`.

`extras`

: Extras as a list of strings

`dependencies`

: Dependencies as parsed by `lib.pep621.parseDependencies`.

::: {.example #function-library-example-lib.pep621.filterDependenciesByEnviron}

`# filterDependenciesByEnviron (lib.pep508.mkEnviron pkgs.python3) (lib.pep621.parseDependencies (lib.importTOML ./pyproject.toml)) { }  # Structure omitted in docs`

:::

---

# eggs - Pyproject.nix

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**Type**: `matchEggFileName :: string -> [ string ]`

Regex match an egg file name, returning a list of match groups. Returns null if no match.

`name`

: Function argument

**Type**: `isEggFileName :: string -> bool`

Check whether string is an egg file or not.

`name`

: The filename string

::: {.example #function-library-example-lib.eggs.isEggFileName}

`# isEggFileName "cryptography-41.0.1-cp37-abi3-manylinux_2_17_aarch64.manylinux2014_aarch64.whl" false`

:::

**Type**: `parsehEggFileName :: string -> AttrSet`

Parse an egg file name.

`name`

: Function argument

::: {.example #function-library-example-lib.eggs.parseEggFileName}

`# parseEggFileName`

:::

**Type**: `selectEggs :: derivation -> [ AttrSet ] -> [ AttrSet ]`

Select compatible eggs from a list and return them in priority order.

`python`

: Python interpreter derivation

`files`

: List of files parsed by parseEggFileName

---

# pypa - Pyproject.nix

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Normalize package name as documented in https://packaging.python.org/en/latest/specifications/name-normalization/#normalization

`string -> string`

`readPyproject "Friendly-Bard" -> "friendly-bard"`

Parse Python tags.

As described in https://packaging.python.org/en/latest/specifications/platform-compatibility-tags/#python-tag.

Type: parsePythonTag :: string -> AttrSet

`parsePythonTag "cp37" -> {   implementation = "cpython";   version = "37"; }`

Parse ABI tags.

As described in https://packaging.python.org/en/latest/specifications/platform-compatibility-tags/#python-tag.

`string -> AttrSet`

``## `lib.pypa.isSdistFileName` {#function-library-lib.pypa.isSdistFileName}  Check whether string is a sdist file or not.  ### Type `string -> bool`  ### Example: ```nix isSdistFileName "cryptography-41.0.1.tar.gz" -> true``

Regex match a wheel file name, returning a list of match groups. Returns null if no match.

`string -> [ string ]`

Check whether string is a wheel file or not.

`string -> bool`

`isWheelFileName "cryptography-41.0.1-cp37-abi3-manylinux_2_17_aarch64.manylinux2014_aarch64.whl" -> true`

Parse PEP-427 wheel file names.

`string -> AttrSet`

`parseFileName "cryptography-41.0.1-cp37-abi3-manylinux_2_17_aarch64.manylinux2014_aarch64.whl" -> {  abiTags = [ "abi3" ];  buildTag = null;  distribution = "cryptography";  languageTags = [  # Parsed by pypa.parsePythonTag    {      implementation = "cpython";      version = "37";    }  ];  platformTags = [ "manylinux_2_17_aarch64" "manylinux2014_aarch64" ];  version = "41.0.1"; }`

Check whether an ABI tag is compatible with this python interpreter.

`derivation -> string -> bool`

`isABITagCompatible pkgs.python3 (pypa.parseABITag "cp37") -> true`

Check whether a platform tag is compatible with this python interpreter.

`AttrSet -> derivation -> string -> bool`

`isPlatformTagCompatible pkgs.python3 "manylinux2014_x86_64" -> true`

Check whether a Python language tag is compatible with this Python interpreter.

`derivation -> AttrSet -> bool`

`isPythonTagCompatible pkgs.python3 (pypa.parsePythonTag "py3") -> true`

Check whether wheel file name is compatible with this python interpreter.

`derivation -> AttrSet -> bool`

`isWheelFileCompatible pkgs.python3 (pypa.parseWheelFileName "Pillow-9.0.1-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl") -> true`

Select compatible wheels from a list and return them in priority order.

`AttrSet -> derivation -> [ AttrSet ] -> [ AttrSet ]`

`selectWheels (lib.systems.elaborate "x86_64-linux") [ (pypa.parseWheelFileName "Pillow-9.0.1-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl") ] -> [ (pypa.parseWheelFileName "Pillow-9.0.1-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl") ]`

---

# pip - Pyproject.nix

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**Type**: `parseRequirementsTxt :: AttrSet -> list`

Parse dependencies from requirements.txt

`requirements`

: The contents of or path to requirements.txt

::: {.example #function-library-example-lib.pip.parseRequirementsTxt}

`# parseRequirements ./requirements.txt [ { flags = []; requirement = {}; # Returned by pep508.parseString } ]`

:::

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# lib - Pyproject.nix

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# renderers - Pyproject.nix

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**Type**: `mkDerivation :: AttrSet -> AttrSet`

Renders a project as an argument that can be passed to stdenv.mkDerivation.

Evaluates PEP-508 environment markers to select correct dependencies for the platform but does not validate version constraints.

structured function argument

: `project`

: Loaded pyproject.nix project

`environ`

: PEP-508 environment

`extras`

: Extras to enable (markers only, `optional-dependencies` are not enabled by default)

**Type**: `mkDerivation :: AttrSet -> AttrSet`

Renders a project as an argument that can be passed to stdenv.mkDerivation.

Evaluates PEP-508 environment markers to select correct dependencies for the platform but does not validate version constraints.

structured function argument

: `project`

: Loaded pyproject.nix project

`environ`

: PEP-508 environment

`extras`

: Extras to enable (markers only, `optional-dependencies` are not enabled by default)

`root`

: Editable root directory as a string

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# resolvers - Pyproject.nix

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Resolve dependencies using a non-circular supporting approach.

This implementation is faster than the one supporting circular dependencies, and is memoized.

`resolveNonCyclic` is intended to resolve build-system dependencies.

`memoNames`

: List of package names to memoize

`set`

: Package set to resolve packages from

Resolve dependencies using a cyclic supporting approach.

`resolveCyclic` is intended to resolve virtualenv dependencies.

`set`

: Package set to resolve packages from

`spec`

: Attribute set of dependencies -> extras `{ requests = [ "socks" ]; }`

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# packages - Pyproject.nix

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Create a virtual environment from dependency specification

`mkVirtualEnv "foo-env" {   foo = [ "extra" ]; }`

`(mkVirtualEnv "foo-env" {   foo = [ "extra" ]; }).overrideAttrs(old: {   # Skip LICENSE file from package root.   venvSkip = [ "LICENSE" ]; })`

`(mkVirtualEnv "foo-env" {   foo = [ "extra" ]; }).overrideAttrs(old: {   # You could also ignore all collisions with:   # venvIgnoreCollisions = [ "*" ];   venvIgnoreCollisions = [ "lib/python${python.pythonVersion}/site-packages/build_tools" ]; })`

`name`

: Venv name

`spec`

: Dependency specification

---

# packages.hooks - Pyproject.nix

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Undo any `$PYTHONPATH` changes done by nixpkgs Python infrastructure dependency propagation.

Used internally by `pyprojectHook`.

Build a pyproject.toml/setuptools project.

Used internally by `pyprojectHook`.

Symlink prebuilt wheel sources.

Used internally by `pyprojectWheelHook`.

Install built projects from dist/\*.whl.

Used internally by `pyprojectHook`.

Create `pyproject.nix` setup hook in package output.

Used internally by `pyprojectHook`.

Rewrite shebangs for cross compiled Python programs.

When cross compiling & installing a Python program the shebang gets written for the install-time Pythhon, which for cross compilation is for the _build host_.

This hook rewrites any shebangs pointing to the build host Python to the target host Python.

Create a virtual environment from buildInputs

Used internally by `mkVirtualEnv`.

Meta hook aggregating the default pyproject.toml/setup.py install behaviour and adds Python.

This is the default choice for both pyproject.toml & setuptools projects.

Hook used to build prebuilt wheels.

Use instead of pyprojectHook.

Hook used to build editable packages.

Use instead of pyprojectHook.

Build an editable package .

Fixup path references in an editable package .

Install hook using pypa/installer.

Used instead of `pyprojectInstallHook` for cross compilation support.

Install dist directory with wheels into output .

Hook used to build a wheel file and install it into the output directory.

Use instead of pyprojectHook.

---

# util - Pyproject.nix

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Build applications without venv cruft.

Virtual environments contains many files that are not relevant when distributing applications. This includes, but is not limited to

*   Python interpreter
*   Activation scripts
*   `pyvenv.cfg`

This helper creates a new derivation, only symlinking venv files relevant for the application.

`util.mkApplication {   venv = pythonSet.mkVirtualEnv "mkApplication-check-venv" {     pip = [ ];   }   package = pythonSet.pip; } => «derivation /nix/store/i60rydd6sagcgrsz9cx0la30djzpa8k9-pip-24.0.drv»`

`mkApplication :: AttrSet -> derivation`

venv : Virtualenv derivation created using `mkVirtualEnv`

package : Python set package

---

# Hacking - Pyproject.nix

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This document outlines hacking on `pyproject.nix` itself, and lays out its project structure.

To start hacking run `nix develop -c hivemind` to run the project in watch mode.

This will start up two processes:

*   A [Nix-unit](https://github.com/adisbladis/nix-unit)
     test runner
*   A [documentation server](https://rust-lang.github.io/mdBook/)
     available at http://localhost:3000

All Nix code lives in `lib/`. Each file has an implementation and a test suite. The attribute path to a an attribute `parseVersion` in `lib/pep440.nix` would be `lib.pep440.parseVersion`.

A function in `lib/test.nix` maps over the public interface of the library and the test suite to generate coverage tests, ensuring that every exported symbol has at least one test covering it.

Integration tests meaning tests that perform environment constructions & builds lives in `test/` and are exposed through Flake checks.

The manual you are reading right now is built from the `doc/` directory. To edit a specific page see the "Edit this page on GitHub" link in the footer for each respective page.

*   Run the entire unit test suite `$ nix-unit --flake .#libTests`
    
*   Run unit tests for an individual function `$ nix-unit --flake .#libTests.pep440.parseVersion`
    
*   Run integration tests `$ nix flake check`
    

Before submitting a PR format the code with `nix fmt` and ensure Flake checks pass with `nix flake check`.

---

# Support - Pyproject.nix

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Commercial support for the `pyproject.nix` ecosystem is offered by [Bladis Limited](https://blad.is/consulting/)
.

---

# pep723 - Pyproject.nix

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**Type**: `parseScript :: string -> AttrSet`

Parse the script metadata section from a PEP-723 script.

`script`

: Function argument

::: {.example #function-library-example-lib.pep723.parseScript}

`# parseScript (readFile ./script.py) {   requires-python = [ ];  # List of parsed version conditions (lib.pep440.parseVersionConds)   dependencies = [ ];  # List of parsed PEP-508 strings (lib.pep508.parseString) }`

:::

---

# query - Pyproject.nix

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The query API is still experimental and subject to change.

Query a package set for a dependency specification to pass to `mkVirtualEnv`.

Returns a specification with _only_ the dependencies of packages, not the queried packages themselves.

This is useful for example if you want to construct a virtualenv with development dependencies for a package, but without containing the package itself.

``query.deps { } pythonSet {   hello-world = [ "dev" ]; } => {   urllib3 = [ ]; # From project.dependencies   ruff = [ ]; # From the `dev` group }``

customisations : Query customisations (whether to include project.dependencies or not)

pythonSet : Python package set

specification : Dependency specifications in the form used by mkVirtualEnv

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