{ buildPythonPackage , fetchPypi , lib , stdenv , pythonOlder , isPy27 , appdirs , contextlib2 , distlib , filelock , importlib-metadata , importlib-resources , pathlib2 , setuptools_scm , six }: buildPythonPackage rec { pname = "virtualenv"; version = "20.0.31"; src = fetchPypi { inherit pname version; sha256 = "43add625c53c596d38f971a465553f6318decc39d98512bc100fa1b1e839c8dc"; }; nativeBuildInputs = [ setuptools_scm ]; propagatedBuildInputs = [ appdirs distlib filelock six ] ++ lib.optionals isPy27 [ contextlib2 ] ++ lib.optionals (isPy27 && !stdenv.hostPlatform.isWindows) [ pathlib2 ] ++ lib.optionals (pythonOlder "3.7") [ importlib-resources ] ++ lib.optionals (pythonOlder "3.8") [ importlib-metadata ]; patches = lib.optionals (isPy27) [ ./0001-Check-base_prefix-and-base_exec_prefix-for-Python-2.patch ]; meta = { description = "A tool to create isolated Python environments"; homepage = "http://www.virtualenv.org"; license = lib.licenses.mit; maintainers = with lib.maintainers; [ goibhniu ]; }; }