__delattr__: 可封装禁止删除属性

# __author: "ZXYang"
# date: 2020/12/15


class Fun(object):
    def __init__(self, name, age, money):
        self.name = name
        self.age = age
        self.money = money

    def __delattr__(self, item):
        if item in ['name', 'age']:
            raise AttributeError("{}属性不能删除".format(item))
        else:
            super().__delattr__(item)


f = Fun('li', 18, 22000.99)

del f.age
print(f.__dict__)

# AttributeError: age属性不能删除