test_abc.py 文件源码

def test_customdescriptors_with_abstractmethod(self):
        class Descriptor:
            def __init__(self, fget, fset=None):
                self._fget = fget
                self._fset = fset
            def getter(self, callable):
                return Descriptor(callable, self._fget)
            def setter(self, callable):
                return Descriptor(self._fget, callable)
            @property
            def __isabstractmethod__(self):
                return (getattr(self._fget, '__isabstractmethod__', False)
                        or getattr(self._fset, '__isabstractmethod__', False))
        class C(metaclass=abc.ABCMeta):
            @Descriptor
            @abc.abstractmethod
            def foo(self): return 3
            @foo.setter
            @abc.abstractmethod
            def foo(self, val): pass
        self.assertRaises(TypeError, C)
        class D(C):
            @C.foo.getter
            def foo(self): return super().foo
        self.assertRaises(TypeError, D)
        class E(D):
            @D.foo.setter
            def foo(self, val): pass
        self.assertFalse(E.foo.__isabstractmethod__)