{
  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";

  outputs = { self, nixpkgs }: let
    inherit (nixpkgs) lib;

    systems = [
      "x86_64-linux"
      "aarch64-linux"
      "x86_64-darwin"
      "aarch64-darwin"
      "armv7l-linux"
    ];

    forAllSystems = f: lib.genAttrs systems (system: f system nixpkgs.legacyPackages.${system});
  in {
    devShells = forAllSystems (_: pkgs: {
      default = pkgs.mkShell {
        packages = with pkgs; [
          python3
          ruff
        ];
      };
    });
  };
}