装饰器property方案2

class People:
    def __init__(self, name):
        self.__name = name

    def get_name(self):
        return self.__name

    def set_name(self, val):
        if type(val) is not str:
            print('必须传入字符串')
            return
        self.__name = val

    def del_name(self):
        print('不让删除')
    name = property(get_name, set_name, del_name)

obj = People('egon')
print(obj.name)  # 如果是这种property