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

  outputs = {
    self,
    nixpkgs,
    flake-utils,
    ...
  }: let
    pythonVersion = "python39";
  in
    flake-utils.lib.eachDefaultSystem (
      system: let
        pkgs = nixpkgs.legacyPackages.${system};
      in rec
      {
        devShells.default = pkgs.mkShell {
          buildInputs = [
            pkgs.cowsay
            pkgs.alejandra
            pkgs.python310Full
          ];
        };
      }
    );
}