{
  inputs.nixpkgs.url = "github:nixos/nixpkgs";
  outputs = { self, nixpkgs }:
    let
      pkgs = nixpkgs.legacyPackages.x86_64-linux;
      my-python = pkgs.python3;
      python-with-my-packages = my-python.withPackages (p: with p; [
        tkinter
      ]);
    in
    {
      devShell.x86_64-linux = pkgs.mkShell {
        buildInputs = with pkgs; [
          yad
          python-with-my-packages
        ];
      };
    };
}