def test_orderedDifferentContainers_gt(self):
        """
        L{twisted.python.constants._Constant.__gt__} returns C{NotImplemented}
        when comparing constants belonging to different containers.
        """
        self.assertEqual(
            NotImplemented,
            NamedLetters.alpha.__gt__(MoreNamedLetters.digamma)
        )

        L{twisted.python.constants._Constant.__gt__} returns C{NotImplemented}
        when comparing constants belonging to different containers.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/python/test/test_constants.py