# class Foo:

#     @property

#     def AAA(self):

#         print('get的时候运行我啊')

#

#     @AAA.setter

#     def AAA(self,val):

#         print('set的时候运行我啊',val)

#     @AAA.deleter

#     def AAA(self):

#         print('del的时候运行我啊')

# #只有在属性AAA定义property后才能定义AAA.setter,AAA.deleter

# f1=Foo()

# f1.AAA

# f1.AAA='aaa'

# del f1.AAA

class Foo:

    def get_AAA(self):

        print('get的时候运行我啊')

    def set_AAA(self,val):

        print('set的时候运行我啊',val)

    def del_AAA(self):

        print('del的时候运行我啊')

    AAA=property(get_AAA,set_AAA,del_AAA)

#只有在属性AAA定义property后才能定义AAA.setter,AAA.deleter

f1=Foo()

f1.AAA

f1.AAA='aaa'

del f1.AAA

class Goods:

    def __init__(self):

        # 原价

        self.original_price = 100

        # 折扣

        self.discount = 0.8

    @property

    def price(self):

        # 实际价格 = 原价 * 折扣

        new_price = self.original_price * self.discount

        return new_price

    @price.setter

    def price(self, value):

        self.original_price = value

    @price.deleter

    def price(self):

        del self.original_price

obj = Goods()

print(obj.price)        # 获取商品价格

obj.price = 200   # 修改商品原价

print(obj.price)

del obj.price     # 删除商品原价

# print(obj.price)