[Help] User service with Python packages for Jupyter - eviltoast

Hi All,
I’m still very new to Nix but trying to daily-drive NixOS.

What I’m currently stuck on is injecting Python packages into a Jupyterlab service. What I have at the moment in the home-manager.home portion of my system flake is the following:

  systemd.user.services.jupyter = let
    jupyter = pkgs.jupyter-all.override {
      python3 = pkgs.python311.withPackages (python-pkgs: with python-pkgs; [
        numpy
        matplotlib
      ]);
    };
  in {
    Service = {
      Type = "simple";
      WorkingDirectory = "${home.homeDirectory}/notebooks";
      ExecStart = "${jupyter}/bin/jupyter-lab --no-browser";
    };
  };

This fires up a JupyterLab process that I can connect to and which runs fine, but numpy etc. can’t be imported. From a devshell, I see that the python.withPackages mechanism seems to rely on $PYTHONPATH to pass in a python3-3.11.8-env package that contains a lib/python3.11/site-packages. I’m guessing that the systemd service just needs to have an Environment key, but where do I get the python3-3.11.8-env path from?

The Jupiter executable is in a /nix/store/#-python3-3.11.8-env/bin location, but the site-packages only include the modules for Jupyter so I assume there’s another python3-3.11.8-env in the nix-store that does have the python packages I’m trying to get. Trying things like jupyter.env gives errors like *** Python 'env' attributes are intended for interactive nix-shell sessions, not for building! *** but I’m just taking a stab in the dark here.

I’d appreciate any pointers on this. I see there are helpers like JupyEnv, but these seem focused on setting up ephemeral devshells, not running a service for long-term notes and seem like overkill for what I want.

  • flashgnash@lemm.ee
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    7 months ago

    I’ve found the best way to use python under nix is not to use nix for its packages because not all of its libraries are in nixpkgs

    Requirements.txt and a venv still work on nixos the same way they would on a normal system