Method test_Callable

Lib/test/test_collections.py:1359–1377

(self)

        self.validate_isinstance(Container, '__contains__')

    def test_Callable(self):
        non_samples = [None, 42, 3.14, 1j,
                       "", b"", (), [], {}, set(),
                       _test_gen(),
                       (x for x in []),
                       ]
        for x in non_samples:
            self.assertNotIsInstance(x, Callable)
            self.assertNotIsSubclass(type(x), Callable)
        samples = [lambda: None,
                   type, int, object,
                   len,
                   list.append, [].append,
                   ]
        for x in samples:
            self.assertIsInstance(x, Callable)
            self.assertIsSubclass(type(x), Callable)
        self.validate_abstract_methods(Callable, '__call__')
        self.validate_isinstance(Callable, '__call__')

    def test_direct_subclassing(self):
        for B in Hashable, Iterable, Iterator, Reversible, Sized, Container, Callable: