test_collections.py 文件源码

def test_Mapping(self):
        for sample in [dict]:
            self.assertIsInstance(sample(), Mapping)
            self.assertTrue(issubclass(sample, Mapping))
        self.validate_abstract_methods(Mapping, '__contains__', '__iter__', '__len__',
            '__getitem__')
        class MyMapping(Mapping):
            def __len__(self):
                return 0
            def __getitem__(self, i):
                raise IndexError
            def __iter__(self):
                return iter(())
        self.validate_comparison(MyMapping())