如何阻止在Python中腌制属性 [英] How to stop attributes from being pickled in Python

问题描述

我正在使用gnosis.xml.pickle将我自己的类的对象转换为xml.初始化该对象，以便:

I am using gnosis.xml.pickle to convert an object of my own class to xml. The object is initialized so that:

self.logger = MyLogger()

但是当我确实将对象转储到字符串中时，我得到了一个异常，指出该选择器遇到了无法修复的类型(thread.lock).

But when I do dump the object to a string I get an exception stating that the pickler encountered an unpickleable type (thread.lock).

有没有一种方法可以标记"记录器属性，以便选择器知道不尝试对它进行标记?

Is there a way to 'tag' the logger attribute so that pickler will know not to try and pickle that attribute?

推荐答案

您可以为类定义两个方法__getstate__和__setstate__，以覆盖默认的酸洗行为.

You can define two methods, __getstate__ and __setstate__, to your class to override the default pickling behavior.

http://docs.python.org/library/pickle.html#object.__getstate__

__getstate__应该返回您要腌制的属性的字典.

__getstate__ should return a dict of attributes that you want to pickle.

def __getstate__(self):
    d = dict(self.__dict__)
    del d['logger']
    return d

__setstate__应该使用提供的字典设置对象.

__setstate__ should setup your object with the provided dict.

def __setstate__(self, d):
    self.__dict__.update(d) # I *think* this is a safe way to do it

请注意，解开时不会调用__init__，因此您必须在__setstate__

Note that __init__ won't be called when unpickling so you'll have to create your logger in __setstate__

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