test_abc.py 文件源码

def test_metaclass_abc(self):
        # Metaclasses can be ABCs, too.
        class A(metaclass=abc.ABCMeta):
            @abc.abstractmethod
            def x(self):
                pass
        self.assertEqual(A.__abstractmethods__, {"x"})
        class meta(type, A):
            def x(self):
                return 1
        class C(metaclass=meta):
            pass