```nix with import {}; with python3Packages; let certbot-s3front = buildPythonPackage rec { pname = "certbot-s3front"; version = "0.17.1"; src = python35.pkgs.fetchPypi { inherit pname version; sha256 = "8b77ef281375db22634952ff9e569d6c4cd83cc4ae40212a7c70be0b7ea49e0b"; }; }; in { # ... home.packages = [ pkgs.certbot certbot-s3front ]; # ... } ```