class Caculator(object):

    name = "caculator"

    def __init__(self, x, y):

        self._x = x

        self._y = y

    @property

    def add(self):

        return self._x + self._y

    @classmethod

    def class_info(cls):    #能够被类和对象调用;入参为cls,只能够访问类的变量,不能够访问对象的变量.

        print("this is a" , cls.name)

    @staticmethod           #能够被类和对象调用;但入参不能为self和cls,因此不能访问对象和类的属性

    def static_show(a, b):

        print(a, b)

if __name__ == "__main__":

cal = Caculator(1, 2)

Caculator.class_info()

cal.class_info()

Caculator.static_show(3, 4)

cal.static_show(3, 4)