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nixpkgs/pkgs/development/python-modules/typing-extensions/default.nix

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{ lib, buildPythonPackage, fetchPypi, pythonOlder, isPy3k, python, typing }:
let
testDir = if isPy3k then "src_py3" else "src_py2";
in buildPythonPackage rec {
pname = "typing_extensions";
version = "3.6.6";
src = fetchPypi {
inherit pname version;
sha256 = "07vhddjnd3mhdijyc3s0mwi9jgfjp3rr056nxqiavydbvkrvgrsi";
};
checkInputs = lib.optional (pythonOlder "3.5") typing;
# Error for Python3.6: ImportError: cannot import name 'ann_module'
# See https://github.com/python/typing/pull/280
doCheck = pythonOlder "3.6";
checkPhase = ''
cd ${testDir}
${python.interpreter} -m unittest discover
'';
meta = with lib; {
description = "Backported and Experimental Type Hints for Python 3.5+";
homepage = https://github.com/python/typing;
license = licenses.psfl;
maintainers = with maintainers; [ pmiddend ];
};
}