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