Class SeqWithWeirdLen

Lib/test/test_enumerate.py:204–212

            list(r)
            self.assertEqual(operator.length_hint(r), 0)
        class SeqWithWeirdLen:
            called = False
            def __len__(self):
                if not self.called:
                    self.called = True
                    return 10
                raise ZeroDivisionError
            def __getitem__(self, index):
                return index
        r = reversed(SeqWithWeirdLen())
        self.assertRaises(ZeroDivisionError, operator.length_hint, r)