{
  description = "Python dev environment using Nix";

  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.05";

  outputs = { self, nixpkgs }: let
    system = "x86_64-linux";
    pkgs = import nixpkgs { inherit system; };
  in {
    devShells.${system}.default = pkgs.mkShell {
      packages = [
        (pkgs.python312.withPackages (ps: with ps; [
          pip
          virtualenv
          black
          pytest
        ]))
      ];
    };
  };
}