TypeError：无法深度复制此模式对象 [英] TypeError: cannot deepcopy this pattern object

问题描述

试图了解我的变量类中的此错误。

Trying to understand this error in my "Variable" class.

我希望在我的变量类中存储一个sre.SRE_Pattern。我刚刚开始复制Variable类，并注意到这导致我的所有Variable类实例都发生了更改。我现在知道需要深度复制此类，但是现在遇到 TypeError：无法深度复制此模式对象。当然，我可以将模式存储为文本字符串，但是我的其余代码已经期望使用已编译模式！用模式对象复制Variable类的最佳方法是什么？

I was hoping to store a sre.SRE_Pattern in my "Variable" class. I just started copying the Variable class and noticed that it was causing all my Variable class instances to change. I now understand that I need to deepcopy this class, but now I run into "TypeError: cannot deepcopy this pattern object". Sure, I can store the pattern as a text string but the rest of my code already expects a compiled pattern! What would be the best way to copy my Variable class with a pattern object?

import re
from copy import deepcopy

class VariableWithRE(object):
    "general variable class"
    def __init__(self,name,regexTarget,type):
        self.name = name
        self.regexTarget = re.compile(regexTarget, re.U|re.M) 
        self.type = type 

class VariableWithoutRE(object):
    "general variable class"
    def __init__(self,name,regexTarget,type):
        self.name = name
        self.regexTarget = regexTarget
        self.type = type 

if __name__ == "__main__":

    myVariable = VariableWithoutRE("myName","myRegexSearch","myType")
    myVariableCopy = deepcopy(myVariable)

    myVariable = VariableWithRE("myName","myRegexSearch","myType")
    myVariableCopy = deepcopy(myVariable)

推荐答案

deepcopy 不了解您的课程，也不知道如何应对y他们。

deepcopy doesn't know anything about your classes and doesn't know how to copy them.

您可以通过实现 __ deepcopy__告诉 deepcopy 如何复制对象。 （）方法：

You can tell deepcopy how to copy your objects by implementing a __deepcopy__() method:

class VariableWithoutRE(object):
   # ...
   def __deepcopy__(self):
      return VariableWithoutRE(self.name, self.regexTarget, self.type)

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