{ description = "A Nix-flake-based Python development environment"; inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz"; outputs = { self, nixpkgs, }: let supportedSystems = ["x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin"]; forEachSupportedSystem = f: nixpkgs.lib.genAttrs supportedSystems (system: f { pkgs = import nixpkgs {inherit system;}; }); in { devShells = forEachSupportedSystem ({pkgs}: { default = pkgs.mkShell { packages = with pkgs; [python312 virtualenv geckodriver] ++ (with pkgs.python312Packages; [pip selenium]); }; }); }; }