Method test_Iterator

Lib/test/test_collections.py:1146–1169

(self)

    def test_Iterator(self):
        non_samples = [None, 42, 3.14, 1j, b"", "", (), [], {}, set()]
        for x in non_samples:
            self.assertNotIsInstance(x, Iterator)
            self.assertNotIsSubclass(type(x), Iterator)
        samples = [iter(bytes()), iter(str()),
                   iter(tuple()), iter(list()), iter(dict()),
                   iter(set()), iter(frozenset()),
                   iter(dict().keys()), iter(dict().items()),
                   iter(dict().values()),
                   _test_gen(),
                   (x for x in []),
                   ]
        for x in samples:
            self.assertIsInstance(x, Iterator)
            self.assertIsSubclass(type(x), Iterator)
        self.validate_abstract_methods(Iterator, '__next__')

        # Issue 10565
        class NextOnly:
            def __next__(self):
                yield 1
                return
        self.assertNotIsInstance(NextOnly(), Iterator)

    def test_Generator(self):
        class NonGen1: