Python 3 __add__,__sub__ 两个类的实例相互加减 (重载运算符 + -)

class MyClass:

    def __init__(self, height, width):
        self.height = height
        self.width= width

    # 两个对象 相加 
    def __add__(self, others):
        return MyClass(self.height + others.height, self.width + others.width)

    # 两个对象 相减 
    def __sub__(self, others):
        return MyClass(self.height - others.height, self.width - others.width)

    #
    def intro(self):
        print("高为", self.height, " 宽为", self.width)


def main():
    a = MyClass(height=10, width=5)
    a.intro()

    b = MyClass(height=20, width=10)
    b.intro()

    c = b - a
    c.intro()

    d = a + b
    d.intro()
    

if __name__ == '__main__':
    main()

https://www.cnblogs.com/xingchuxin/p/10425667.html