test_weakref.py 文件源码

def test_proxy_ref(self):
        o = C()
        o.bar = 1
        ref1 = weakref.proxy(o, self.callback)
        ref2 = weakref.proxy(o, self.callback)
        del o
        gc_collect()

        def check(proxy):
            proxy.bar

        self.assertRaises(ReferenceError, check, ref1)
        self.assertRaises(ReferenceError, check, ref2)
        ref3 = weakref.proxy(C())
        gc_collect()
        self.assertRaises(ReferenceError, bool, ref3)
        self.assertEqual(self.cbcalled, 2)