Nixpkgs-python: use any Python using Nix

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1

Hi all!

Have you ever wanted to use a specific version of Python using Nix?

Supports all Python versions from 2.7.6 to the latest 3.11.3, updated hourly.

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Is it possible to specify which pip packages should be included in the installation?

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Took me a moment to digest that flake.nix, but it just builds the nixpkgs python package with a bunch of overrides for each version of python applied.

In other words, @kzvi, yes - unless I’m very mistaken.

@domenkozar in fact modularized the upstream python definitions to fully accept building various versions, including the passthrus, which include the withPackages function: https://github.com/domenkozar/nixpkgs/blob/b19f607a1b1d36a02741cf3aefe674bd3848fcf6/pkgs/development/interpreters/python/passthrufun.nix#L86

This is very cool :slight_smile: I don’t think it caches pip packages, though, so you’ll need to “build” those downstream?

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Exactly.

You can see how I install packages using pip in nixpkgs-python devenv.nix.

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you gave some example using flake on your readme, how could i create a simple nix file instead using it? Could you give me an example, please?

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Perhaps something like this, depending on how you want to use it:

$ nix-shell
bash-5.2$ python2.7
Python 2.7.18 (default, Jul 12 2023, 15:16:47)
[GCC Clang 11.1.0] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> print "statements omg"
statements omg
>>>

bash-5.2$ cat shell.nix
let
  pkgs = (import (fetchTarball "https://github.com/NixOS/nixpkgs/archive/nixos-23.05.tar.gz") { });
  nixpkgs-python = import  (fetchTarball "https://github.com/cachix/nixpkgs-python/archive/refs/heads/main.zip");
in
  pkgs.mkShell {
    buildInputs = [
      (nixpkgs-python.packages.aarch64-darwin."2.7")
    ];
  }
bash-5.2$
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FYI I added the link to the nixos wiki (in the first section aswell as in the “See also”). Hope that’s fine/correct.

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