{ stdenv, buildPythonPackage, fetchPypi, isPy36 }: buildPythonPackage rec { pname = "dataclasses"; version = "0.7"; # backport only works on Python 3.6, and is in the standard library in Python 3.7 disabled = !isPy36; src = fetchPypi { inherit pname version; sha256 = "494a6dcae3b8bcf80848eea2ef64c0cc5cd307ffc263e17cdf42f3e5420808e6"; }; meta = with stdenv.lib; { description = "An implementation of PEP 557: Data Classes"; homepage = "https://github.com/ericvsmith/dataclasses"; license = licenses.asl20; maintainers = with maintainers; [ catern ]; }; }