{
  description = "A Nix-flake-based Python development environment for the Fagos Discord bot";
  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1";
  outputs = inputs:
    let
      supportedSystems = [ "x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin" ];
      forEachSupportedSystem = f: inputs.nixpkgs.lib.genAttrs supportedSystems (system: f {
        pkgs = import inputs.nixpkgs { inherit system; };
      });
      version = "3.13";
    in
    {
      # Development shell for `nix develop`
      devShells = forEachSupportedSystem ({ pkgs }:
        let
          concatMajorMinor = v:
            pkgs.lib.pipe v [
              pkgs.lib.versions.splitVersion
              (pkgs.lib.sublist 0 2)
              pkgs.lib.concatStrings
            ];
          python = pkgs."python${concatMajorMinor version}";
        in
        {
          default = pkgs.mkShell {
            venvDir = ".venv";
            postShellHook = ''
              venvVersionWarn() {
                local venvVersion
                venvVersion="$("$venvDir/bin/python" -c 'import platform; print(platform.python_version())')"
                [[ "$venvVersion" == "${python.version}" ]] && return
                cat <<EOF
              Warning: Python version mismatch: [$venvVersion (venv)] != [${python.version}]
                       Delete '$venvDir' and reload to rebuild for version ${python.version}
              EOF
              }
              venvVersionWarn
            '';
            packages = with python.pkgs; [
              venvShellHook
              pip
              discordpy
            ];
          };
        });

      # Packages for `nix build`
      packages = forEachSupportedSystem ({ pkgs }:
        let
          concatMajorMinor = v:
            pkgs.lib.pipe v [
              pkgs.lib.versions.splitVersion
              (pkgs.lib.sublist 0 2)
              pkgs.lib.concatStrings
            ];
          python = pkgs."python${concatMajorMinor version}";
          # Define the bot package using buildPythonApplication
          fagos = python.pkgs.buildPythonApplication {
            pname = "fagos";
            version = "0.1.0";
            src = ./.;
            format = "pyproject"; # Remove if no pyproject.toml
            nativeBuildInputs = with python.pkgs; [ setuptools ];
            propagatedBuildInputs = with python.pkgs; [ discordpy ];
            doCheck = false;
          };
        in
        {
          default = fagos;
        });

      # Apps for `nix run`
      apps = forEachSupportedSystem ({ pkgs }:
        let
          concatMajorMinor = v:
            pkgs.lib.pipe v [
              pkgs.lib.versions.splitVersion
              (pkgs.lib.sublist 0 2)
              pkgs.lib.concatStrings
            ];
          python = pkgs."python${concatMajorMinor version}";
          # Create a Python environment with discordpy
          myPython = python.withPackages (ps: with ps; [ discordpy ]);
          # Create a shell script to run bot.py
          fagosApp = pkgs.writeShellScriptBin "fagos" ''
            exec ${myPython}/bin/python ${./bot.py} "$@"
          '';
        in
        {
          default = {
            type = "app";
            program = "${fagosApp}/bin/fagos";
          };
        });
    };
}