装饰器 property

@property装饰器

• property属性内部进行一系列的逻辑计算，将计算结果返回

• 检查参数

• 把一个方法变成属性调用的

1. 简单逻辑运算

   from datetime import date
   
   class Monkey(object):
   
       def __init__(self, new_name, term, height):
           self.name = new_name
           self.term = term
           self.__height = height
   
       @property
       def suppress(self):
           return date.today().year - self.term
   
       @property
       def height(self):
           return self.__height  # 一定要是私有属性, 只读属性
   
       @height.setter      验证参数
       def height(self, value):
           if not isinstance(value, int):
           
               self.__height = value
   
   
   if __name__ == '__main__':
       monkey = Monkey('wukong', 500, 99)
       lock_up = monkey.suppress
       monkey.height = 200
       height = monkey.height
       print(height)
   
   
   

2. 简单逻辑运算

   class Goods(object):
   
       def __init__(self):
           self.original_price = 100  原价
           self.discount = 0.8        折扣
   
       @property
       def price(self):
       
           new_price = self.original_price * self.discount   实际价格 = 原价 * 折扣
           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        # 获取商品价格      80
   obj.price = 200   # 修改商品原价     200 * 0.8 = 160
   del obj.price     # 删除商品原价    删除之后在打印，报错啦