{ self, lib, ... }: { perSystem = { pkgs, ... }: { devshells.default = let pythonEnv = (pkgs.python310.withPackages (p: with p; [ pkgs.qtile.passthru.unwrapped ])); in { devshell.packages = [ pythonEnv ]; env = [ { name = "PYTHONPATH"; value = "${pythonEnv}/${pythonEnv.sitePackages}"; } ]; }; }; }