def test_lessThan(self):
        """
        L{cmp} returns -1 if its first argument is smaller than its second.
        """
        self.assertEqual(cmp(0.1, 2.3), -1)
        self.assertEqual(cmp(b"a", b"d"), -1)

        L{cmp} returns -1 if its first argument is smaller than its second.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/test/test_compat.py