{ lib, buildPythonPackage, fetchPypi, pythonOlder, isPy3k, isPyPy, python }: let testDir = if isPy3k then "src" else "python2"; in buildPythonPackage rec { pname = "typing"; version = "3.7.4.1"; src = fetchPypi { inherit pname version; sha256 = "91dfe6f3f706ee8cc32d38edbbf304e9b7583fb37108fef38229617f8b3eba23"; }; # Error for Python3.6: ImportError: cannot import name 'ann_module' # See https://github.com/python/typing/pull/280 # Also, don't bother on PyPy: AssertionError: TypeError not raised doCheck = pythonOlder "3.6" && !isPyPy; checkPhase = '' cd ${testDir} ${python.interpreter} -m unittest discover ''; meta = with lib; { description = "Backport of typing module to Python versions older than 3.5"; homepage = "https://docs.python.org/3/library/typing.html"; license = licenses.psfl; }; }