pickle錯誤異常_pickle.UnpicklingError和AttributeError

_pickle.UnpicklingError: NEWOBJ class argument isn't a type object

AttributeError: Can't get attribute 'admin' on <module '__main__' from 'C:PycharmProjects/subject_system/src/admin_interface.py'>

先看原來錯誤的代碼 

import pickle
from conf import setting

with open(setting.ADMIN, 'rb') as file:
    print(pickle.load(file))

我在setting.ADMIN的路徑的文件存的是自定義類admin實例化的對象，直接用pickle的load方法反序列化會拋出異常：

AttributeError: Can't get attribute 'admin' on <module '__main__' from 'C:PycharmProjects/subject_system/src/admin_interfa

ce.py'>

說是在admin_interface.py文件中找不到admin變量，於是我又導入了自定義的admin模塊

import pickle
from src import admin
from conf import setting

with open(setting.ADMIN, 'rb') as file:
    print(pickle.load(file))

運行了一下 ，又拋出異常：

_pickle.UnpicklingError: NEWOBJ class argument isn't a type object

 百度了一下，也沒找到解決方法

最后想了一下pickle反序列化的原理，反序列化應該是根據一個模板將二進制數據還原的過程，所以應該導入序列化時自定義類型

import pickle
from src.admin import admin
from conf import setting

with open(setting.ADMIN, 'rb') as file:
    print(pickle.load(file))
 

這下下運行結果正常了

{1: <src.admin.admin object at 0x05594D10>}

 總結：

在使用pickle反序列化的時候，要預先導入二進制數據中存在的自定義類數據的類