python - Python Pickle 中的已知错误？

Question

给出以下代码:

import pickle

class Test:
    d = {}    

    def func(self):
        self.d['x'] = 'y'

test = Test()
test.func()
pickle.dump(test, open('test.p', 'wb'))

%reset

import pickle
class Test:
    d = {}    

    def func(self):
        self.d['x'] = 'y'


print(pickle.load(open('test.p', 'rb')).d)

我期望输出

y
y

然而，实际输出是

y
{}

这是一个已知的错误还是我误解了什么？

我在 Windows 上使用 Miniconda Python 3.5.2。

Answer 1

来自pickle documentation

... when class instances are pickled, their class’s code and data are not pickled along with them. Only the instance data are pickled.

您看到的行为已记录在案，并且没有错误。