pickletester.py 文件源码

def test_proto(self):
        for proto in protocols:
            pickled = self.dumps(None, proto)
            if proto >= 2:
                proto_header = pickle.PROTO + bytes([proto])
                self.assertTrue(pickled.startswith(proto_header))
            else:
                self.assertEqual(count_opcode(pickle.PROTO, pickled), 0)

        oob = protocols[-1] + 1     # a future protocol
        build_none = pickle.NONE + pickle.STOP
        badpickle = pickle.PROTO + bytes([oob]) + build_none
        try:
            self.loads(badpickle)
        except ValueError as err:
            self.assertIn("unsupported pickle protocol", str(err))
        else:
            self.fail("expected bad protocol number to raise ValueError")