#!/usr/bin/env python
# -*- coding: UTF-8 -*-
# @IDE    ：PyCharm
# @Author ：Shen LI
# @Date   ：2020/7/6 10:49
class MyClass():

    def __init__(self,x,y):
        self.x = x
        self.y = y

    def add(self):

        return self.x + self.y

    def sub(self):

        return self.x - self.y