Add Nix to Python projects - as simple as possible

[pimiddy]

I’m asking for experience reports here. My situation is:

• I’ve got multiple Python projects I would like to use Nix with. They have a setup.py and I’m currently using pip to install dependencies (as in pip install -e .[some-flags]).

• Ideally, I would like to not write any custom Nix derivations for these projects and have one derived for me from the setup.py, or possibly from a requirements.txt or something similar. My goals would be:

• Using direnv + nix-shell to auto-load a nice shell environment with all dependencies in place when I cd into the directory.

• Package my application into a Docker container easily (possibly only one of the entry_points).

Is something like that possible? I saw that there is…

• pypi2nix which has been abandoned
• poetry2nix for which I would have to adopt poetry, a step I’d be willing to take if it really works.

Is there any…methodology or something I missed?

[jonringer]

@pimiddy

I’ve got multiple Python projects I would like to use Nix with. They have a setup.py and I’m currently using pip to install dependencies (as in pip install -e .[some-flags] ).

I would take a look at nixpkgs/python.section.md at 3d6adb6f7d62be1257808d055696a07dd3ec68f6 · NixOS/nixpkgs · GitHub

@pimiddy

Ideally, I would like to not write any custom Nix derivations for these projects and have one derived for me from the setup.py , or possibly from a requirements.txt or something similar. My goals would be:

Sounds like a good use case for GitHub - DavHau/mach-nix: Create highly reproducible python environments

@pimiddy

Using direnv + nix-shell to auto-load a nice shell environment with all dependencies in place when I cd into the directory.

See first reply, and just enable direnv

@pimiddy

Package my application into a Docker container easily (possibly only one of the entry_points ).

You probably will do something like:

  dockerTools.buildImage {
    ...
    contents = [ (python3Packages.toPythonApplication python3Packages.myPkg) ];
  }

[pimiddy]

That must be the best, most comprehensive answer I have ever received on a forum, thanks Jon! I’ll take a look at mach-nix and poetry2nix and see if one of them is what I wanted.

[GTrunSec]

mach-nix with nix-flakes Example: Coding-Dev-Env-With-NixFlake/flake.nix at 14340dc405871f1be5b5a4d50ea616c7923fe239 · GTrunSec/Coding-Dev-Env-With-NixFlake · GitHub