运算符原理

class MyOperator:
    def __init__(self, data):
        self.data = data

    def __add__(self, other):
        return self.data + other.data

    def __sub__(self, other):
        return self.data.replace(other.data,'')

    def __str__(self):
        return self.data


m1 = MyOperator('gggggggggg')
m2 = MyOperator('hhhhhh')
m3 = MyOperator(m1 + m2)
print(m3)
m4 = MyOperator(m3 - m1)
print(m4)