test_collections.py 文件源码

def test_Iterable(self):
        # Check some non-iterables
        non_samples = [None, 42, 3.14, 1j]
        for x in non_samples:
            self.assertNotIsInstance(x, Iterable)
            self.assertFalse(issubclass(type(x), Iterable), repr(type(x)))
        # Check some iterables
        samples = [bytes(), str(),
                   tuple(), list(), set(), frozenset(), dict(),
                   dict().keys(), dict().items(), dict().values(),
                   (lambda: (yield))(),
                   (x for x in []),
                   ]
        for x in samples:
            self.assertIsInstance(x, Iterable)
            self.assertTrue(issubclass(type(x), Iterable), repr(type(x)))
        # Check direct subclassing
        class I(Iterable):
            def __iter__(self):
                return super().__iter__()
        self.assertEqual(list(I()), [])
        self.assertFalse(issubclass(str, I))
        self.validate_abstract_methods(Iterable, '__iter__')
        self.validate_isinstance(Iterable, '__iter__')