test_inspect.py 文件源码

def test_getmembers_descriptors(self):
        class A(object):
            dd = _BrokenDataDescriptor()
            md = _BrokenMethodDescriptor()

        def pred_wrapper(pred):
            # A quick'n'dirty way to discard standard attributes of new-style
            # classes.
            class Empty(object):
                pass
            def wrapped(x):
                xname = None
                if '__name__' in dir(x):
                    xname = x.__name__
                elif isinstance(x, (classmethod, staticmethod)):
                    # Some of PyPy's standard descriptors are
                    # class/staticmethods
                    xname = x.__func__.__name__
                if xname is not None and hasattr(Empty, xname):
                    return False
                return pred(x)
            return wrapped

        ismethoddescriptor = pred_wrapper(inspect.ismethoddescriptor)
        isdatadescriptor = pred_wrapper(inspect.isdatadescriptor)

        self.assertEqual(inspect.getmembers(A, ismethoddescriptor),
            [('md', A.__dict__['md'])])
        self.assertEqual(inspect.getmembers(A, isdatadescriptor),
            [('dd', A.__dict__['dd'])])

        class B(A):
            pass

        self.assertEqual(inspect.getmembers(B, ismethoddescriptor),
            [('md', A.__dict__['md'])])
        self.assertEqual(inspect.getmembers(B, isdatadescriptor),
            [('dd', A.__dict__['dd'])])