Python - Blender Game Engine : _pickle. PicklingError: Can't pickle <class '__main__."a class "'>: attribute lookup "a class"on __main__ failed

Question

import pickle

class NoClass():
    def __init__(self, name, level, cls, time_played):
        self.name = name
        self.level = level
        self.cls = cls
        self.time_played = time_played

def Write_char_file(registered_username):
    avatar = NoClass('',1,'',0) #--------i am trying to pickle and write this
    a = str('Characters\%s.txt' % registered_username) #---- the saving file
    f = open(a, 'wb')
    f.write(pickle.dumps(avatar))
    f.close()

def Asign_to_slot(char_lst):
    pass

Asign_to_slot(Write_char_file('my_name'))

When trying to run this in bge it raises that error BUT when i run it with python IDLE there isn't a problem and i manage to write the pickled class in the file though i know classes usually can't be pickled then i even manage to open the file, unpickle it and print the class' attributes

"_pickle.PicklingError: Can't pickle <class '__main__.NoClass'>: attribute lookup NoClass on __main__ failed"

Answer 1

由于这在 blender 中运行时有效并且仅在游戏引擎中失败，我认为这与游戏引擎 python 绑定(bind)中的优化有关。

在 handling stateful objects 之后示例和添加自定义 __getstate__ 也失败，表明游戏引擎可能实现自定义 __slots__仅提供最小的功能集。

解决方案似乎是直接 pickle 对象 __dict__，然后您还需要 unpickle 到新实例 __dict__。

f.write(pickle.dumps(avatar.__dict__))