克服Python对实例方法的限制 [英] Overcoming Python's limitations regarding instance methods

问题描述

似乎Python对实例方法有一些限制。

1. 无法复制实例方法。


2. 实例方法不能被腌制。

这对我来说有问题，面向对象的项目，其中我引用了实例方法，并且同时使用了deepcopying和pickling。酸洗的东西主要是通过多处理机制完成的。

什么是一个好的方法来解决这个问题？我对复制问题做了一些丑陋的解决方法，但
我正在寻找一个更好的解决这两个问题。

有没有任何建议？ p>

更新：

我的用例：我有一个小型事件系统。每个事件都有一个 .action 属性指向它应该触发的函数，有时该函数是某个对象的实例方法。

解决方案

您可以使用 copy_reg.pickle 。在Python 2.6中：

  import copy_reg 
 import types 
 
 def reduce_method 
 return（getattr，（m .__ self__，m .__ func __.__ name__））
 
 copy_reg.pickle（types.MethodType，reduce_method）
  

这不会存储方法的代码，只是它的名称;但这将在正常情况下正常工作。

这使得酸洗和复制工作！

It seems that Python has some limitations regarding instance methods.

1. Instance methods can't be copied.
2. Instance methods can't be pickled.

This is problematic for me, because I work on a very object-oriented project in which I reference instance methods, and there's use of both deepcopying and pickling. The pickling thing is done mostly by the multiprocessing mechanism.

What would be a good way to solve this? I did some ugly workaround to the copying issue, but I'm looking for a nicer solution to both problems.

Does anyone have any suggestions?

Update:

My use case: I have a tiny event system. Each event has an .action attribute that points to a function it's supposed to trigger, and sometimes that function is an instance method of some object.

解决方案

You might be able to do this using copy_reg.pickle. In Python 2.6:

import copy_reg
import types

def reduce_method(m):
    return (getattr, (m.__self__, m.__func__.__name__))

copy_reg.pickle(types.MethodType, reduce_method)

This does not store the code of the method, just its name; but that will work correctly in the common case.

This makes both pickling and copying work!

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