Method test_len

Lib/test/test_builtin.py:1314–1346

(self)

        self.assertRaises(TypeError, issubclass)

    def test_len(self):
        self.assertEqual(len('123'), 3)
        self.assertEqual(len(()), 0)
        self.assertEqual(len((1, 2, 3, 4)), 4)
        self.assertEqual(len([1, 2, 3, 4]), 4)
        self.assertEqual(len({}), 0)
        self.assertEqual(len({'a':1, 'b': 2}), 2)
        class BadSeq:
            def __len__(self):
                raise ValueError
        self.assertRaises(ValueError, len, BadSeq())
        class InvalidLen:
            def __len__(self):
                return None
        self.assertRaises(TypeError, len, InvalidLen())
        class FloatLen:
            def __len__(self):
                return 4.5
        self.assertRaises(TypeError, len, FloatLen())
        class NegativeLen:
            def __len__(self):
                return -10
        self.assertRaises(ValueError, len, NegativeLen())
        class HugeLen:
            def __len__(self):
                return sys.maxsize + 1
        self.assertRaises(OverflowError, len, HugeLen())
        class HugeNegativeLen:
            def __len__(self):
                return -sys.maxsize-10
        self.assertRaises(ValueError, len, HugeNegativeLen())
        class NoLenMethod(object): pass
        self.assertRaises(TypeError, len, NoLenMethod())

    def test_map(self):
        self.assertEqual(