{
  description = "Python project flake";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    flake-parts.url = "github:hercules-ci/flake-parts";
  };

  outputs = inputs@{ self, nixpkgs, flake-parts, ... }:
    flake-parts.lib.mkFlake { inherit inputs; } {
      systems = [ "x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin" ];

      perSystem = { config, self', inputs', pkgs, system, ... }: 
        let
          python = pkgs.python314; 
        in
        {
          packages.default = python.pkgs.buildPythonApplication {
            pname = "my-app";
            version = "0.1.0";
            src = ./.;
            format = "pyproject"; 

            nativeBuildInputs = [
              python.pkgs.hatchling
            ];

            propagatedBuildInputs = with python.pkgs; [
              # Add runtime dependencies here (e.g., requests, pandas)
            ];

            pythonImportsCheck = [ "my_app" ]; # Good practice to verify installs
          };

          devShells.default = pkgs.mkShell {
            inputsFrom = [ self'.packages.default ];

            packages = [
              pkgs.ruff     # Linter/Formatter
              pkgs.pyright  # Type checker (replaced 'ty')
            ];

            shellHook = ''
              export PYTHONPATH="$PYTHONPATH:$(pwd)"
            '';
          };
        };
    };
}