test_dict.py 文件源码

def test_itemiterator_pickling(self):
        for proto in range(pickle.HIGHEST_PROTOCOL + 1):
            data = {1:"a", 2:"b", 3:"c"}
            # dictviews aren't picklable, only their iterators
            itorg = iter(data.items())
            d = pickle.dumps(itorg, proto)
            it = pickle.loads(d)
            # note that the type of type of the unpickled iterator
            # is not necessarily the same as the original.  It is
            # merely an object supporting the iterator protocol, yielding
            # the same objects as the original one.
            # self.assertEqual(type(itorg), type(it))
            self.assertIsInstance(it, collections.abc.Iterator)
            self.assertEqual(dict(it), data)

            it = pickle.loads(d)
            drop = next(it)
            d = pickle.dumps(it, proto)
            it = pickle.loads(d)
            del data[drop[0]]
            self.assertEqual(dict(it), data)