Class IterBlock

Lib/test/test_collections.py:1125–1128

            def __contains__(self): return False
            __len__ = None
        class IterBlock:
            def __len__(self): return 0
            def __contains__(self): return True
            __iter__ = None
        self.assertNotIsSubclass(SizeBlock, Collection)
        self.assertNotIsInstance(SizeBlock(), Collection)
        self.assertNotIsSubclass(IterBlock, Collection)