我可以在Python中为内置类重载运算符吗? [英] Can I overload operators for builtin classes in Python?

问题描述

是否可以在Python 3中为内置类重载运算符?具体来说，我想重载+/+=(即str类的__add__运算符，以便可以执行"This is a " + class(bla)之类的事情.

Is it possible to overload an operator for a builtin class in Python 3? Specifically, I'd like to overload the +/+= (i.e: __add__ operator for the str class, so that I can do things such as "This is a " + class(bla).

推荐答案

您不能更改str的__add__，但是您可以定义如何将您的类添加到字符串中.不过，我不建议这样做.

You can't change str's __add__, but you can define how to add your class to strings. I don't recommend it, though.

class MyClass(object):
    ...
    def __add__(self, other):
        if isinstance(other, str):
            return str(self) + other
        ...
    def __radd__(self, other):
        if isinstance(other, str):
            return other + str(self)
        ...

在"asdf" + thing中，如果"asdf".__add__不知道如何处理加法，Python会尝试thing.__radd__("asdf").

In "asdf" + thing, if "asdf".__add__ doesn't know how to handle the addition, Python tries thing.__radd__("asdf").

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