Class PointlessComparator

Lib/test/test_sort.py:358–360

        # The following test is also by ppperry. It ensures that
        # unsafe_object_compare handles Py_NotImplemented appropriately.
        class PointlessComparator:
            def __lt__(self, other):
                return NotImplemented
        L = [PointlessComparator(), PointlessComparator()]
        self.assertRaises(TypeError, L.sort)
        self.assertRaises(TypeError, [(x,) for x in L].sort)