XX. Object-oriented property use

A. Property property property using a static nature is to achieve a get, set, delete the three methods

class Foo: 
    the @Property 
    DEF AAA (Self):
         Print ( ' GET when I run ah ' ) 

    @ AAA.setter 
    DEF AAA (Self, value):
         Print (value, " *********** ******************************** " )
         Print ( ' the SET when I run ah ' ) 

    @ AAA.deleter 
    DEF AAA (Self):
         Print ( ' the Delete when I run ah ' ) 

# can only be defined AAA.setter, AAA.deleter AAA attributes defined in the property 
f1 = Foo () 
f1.AAA
f1.AAA  =' aaa ' 
del f1.AAA 

# 
# GET when I run ah 
# run my ah set when 
# the Delete when I run ah

= Property AAA (get_AAA, set_AAA, delete_AAA) # built property three parameters with get, set, delete one to one 


class Foo:
     DEF get_AAA (Self):
         Print ( ' GET when I run ah ' ) 

    DEF set_AAA (Self, value):
         Print ( ' the SET when I run ah ' ) 

    DEF delete_AAA (Self):
         Print ( ' the Delete when I run ah ' ) 

    AAA = property (get_AAA, set_AAA, delete_AAA) # built property three parameters and get, set, delete correspondence 

F1 = Foo () 
f1.AAA 
f1.AAA =' Aaa ' 
del f1.AAA 

# GET when I run ah 
# run my ah set when 
# the Delete when I run ah

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()
obj.price          # Gets commodity prices 
obj.price = 200    # modify original price of goods 
Print (obj.price)
 del obj.price      # delete the original price of goods 

Case One

 

Reproduced in: https: //www.cnblogs.com/Sup-to/p/11090349.html