小编use*_*851的帖子

我了解了如何通过浏览这些链接在Python中运行时替换方法.[ Link1,Link2和Link3 ].

当我替换A类的"update_private_variable"方法时,它被替换但不更新私有变量.

import types

class A:
    def __init__(self):
        self.__private_variable = None
        self.public_variable = None

    def update_private_variable(self):
        self.__private_variable = "Updated in A"

    def update_public_variable(self):
        self.public_variable = "Updated in A"

    def get_private_variable(self):
        return self.__private_variable

class B:
    def __init__(self):
        self.__private_variable = None
        self.public_variable = None

    def update_private_variable(self):
        self.__private_variable = "Updated in B"

    def update_public_variable(self):
        self.public_variable = "Updated in B"

在没有替换的情况下调用方法:

a_instance  = A()
a_instance.update_private_variable()
print(a_instance.get_private_variable())
#prints "Updated in A"   

更换后调用方法时:

a_instance  = A()
a_instance.update_private_variable =  types.MethodType(B.update_private_variable, a_instance) …