class Animal(object):

    def __init__(self, name, age, localtion):

        self.__name = name

        self.__age = age

        self.__localtion = localtion

    def get_info(self):

        return 'name = {}, age = {}, localtion = {}'.format(self.__name, self.__age, self.__localtion)

    def change_info(self,name,age,location):

        self.__name = name

        self.__age = age

        self.__location = location

dog = Animal('wangwang', 1, 'GuangDong')

print(dog.get_info())

dog.change_info('wangcai',3,'Error')

print(dog.get_info())

标注为Error的为最后输出错误的地方

结果仍为“GongDong”