python运算符重载和朋友 [英] python operator overload and friends

问题描述

我想知道是否有人可以给我一个关于如何在类中重载运算符的示例，在我的情况下是+运算符.我可以定义一个功能(不是类方法)吗?我是新手，所以我真的不知道该怎么做.

I wanted to know if anyone could give me an example of how to overload an operator within a class, in my case the + operator. Could I define a function (not a class method) that does it? I'm a newbie so I don't really know how to do it.

谢谢

推荐答案

class MyNum(object):
    def __init__(self, val):
        super(MyNum,self).__init__()
        self.val = val

    def __add__(self, num):
        return self.__class__.(self.val + num)

    def __str__(self):
        return self.__class__.__name__ + '(' + str(self.val) + ')'

print(MyNum(3) + 2)   # -> MyNum(5)

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