anchor.diff:  , buildPythonPackage
   , fetchPypi
   , hypothesis
  +, poetry-core
   , pytestCheckHook
   , pytz
   , pythonOlder
  
positive.code: buildPythonPackage rec {
    pname = "iso8601";
    version = "1.0.2";
    format = "setuptools";
  
    disabled = pythonOlder "3.6";
  
  
negative.code:     inherit pname version;
      sha256 = "sha256-J/UDIg5oRdnblU+yErlbA2LYt+bBsjJqhwYcPek1lLE=";
    };
  
    nativeBuildInputs = [
      poetry-core
    ];
  
    checkInputs = [
      hypothesis
  