python类方法中的自卸扣

我正在尝试创建一个对象,它可以用class方法序列化和反序列化自己,而不使用return语句(我不需要静态方法)。这是我的类的一个概念,也是一个简单的用例:

import pickle

class A:
    def __init__(self):
        self.x = 0

    def add(self):
        self.x += 1

    def serialize(self, filename):
        """Simple object serialization given a filename"""
        with open(filename, 'wb') as f:
            pickle.dump(self, f)
            print("Serialized with value of: %d" % (self.x))

    def deserialize(self, filename):
        """Simple object deserialization given a filename"""
        with open(filename, 'rb') as f:
            print("self.x before load (inside deserialize): %d" % (self.x))
            self = pickle.load(f)
            print("Deserialized value inside deserialize function: %d" % (self.x))



a1 = A()
a2 = A()

a1.add()
a1.add()

a1.serialize('a.pkl')
a2.deserialize('a.pkl')

print("Deserialized value outside: %d" % (a2.x))

self (在本例中 a2

运行时输出:

>> Serialized with value of: 2
>> self.x before load (inside deserialize): 0
>> Deserialized value inside deserialize function: 2
>> Deserialized value outside: 0

为什么会这样?我也试过 deepcopy 就在比赛结束后 pickle.load deserialize 但似乎什么都不管用,我想知道为什么。

提前谢谢