test_abc.py 文件源码

def test_ABC_helper(self):
        # create an ABC using the helper class and perform basic checks
        class C(abc.ABC):
            @classmethod
            @abc.abstractmethod
            def foo(cls): return cls.__name__
        self.assertEqual(type(C), abc.ABCMeta)
        self.assertRaises(TypeError, C)
        class D(C):
            @classmethod
            def foo(cls): return super().foo()
        self.assertEqual(D.foo(), 'D')