property相关补充

 # Author : Kelvin
 # Date : 2019/1/25 15:20
 class Foo:
     def __init__(self):
         self.original_price = 100
         self.discount = 0.8

     @property
     def price(self):
         new_price = self.original_price * self.discount
         return new_price

     @price.setter
     def price(self, val):
         self.original_price = val

     @price.deleter
     def price(self):
         del self.original_price

 f = Foo()
 print(f.price)
 f.price = 200
 print(f.price)
 del f.price
 print(f.__dict__)

 """输出结果：
 80.0
 160.0
 {'discount': 0.8}
 """