{
  description = "Reusable Python development environment";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs = { self, nixpkgs, flake-utils }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = import nixpkgs { inherit system; };
        
        # Python version configuration - easy to change in one place
        pythonVersion = pkgs.python311;
        
        # Define Python packages in a separate variable for clarity
        pythonPackages = ps: with ps; [
          # Data science
          numpy
          pandas
          matplotlib
          scipy
          
          # Web and networking
          requests
          httpx
          beautifulsoup4
          
          # Development tools
          black
          pylint
          pytest
          ipython
          
          # Add more packages as needed
        ];
        
        # Create the Python environment with the specified packages
        pythonEnv = pythonVersion.withPackages pythonPackages;
      in
      {
        # Development shell for interactive use
        devShells.default = pkgs.mkShell {
          buildInputs = [
            pythonEnv
            pkgs.poetry
            pkgs.git
          ];
          
          shellHook = ''
            echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
            echo "🐍 Python $(${pythonVersion}/bin/python --version)"
            echo "📦 Poetry $(${pkgs.poetry}/bin/poetry --version)"
            echo "📂 Working directory: $(pwd)"
            echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
          '';
        };
        
        # Make the Python environment available as a package
        packages.default = pythonEnv;
        
        # Add an app that runs Python directly
        apps.default = flake-utils.lib.mkApp {
          drv = pythonEnv;
          name = "python";
          exePath = "/bin/python";
        };
        
        # Add formatter for consistent Nix code formatting
        formatter = pkgs.nixpkgs-fmt;
      }
    );
}