描述符基础

class Descriptor:
   def __get__(self, instance, owner):
       return instance._value
   
   def __set__(self, instance, value):
       if value < 0:
           raise ValueError("值不能为负")
       instance._value = value

class MyClass:
   attr = Descriptor()

property 实现

class Temperature:
   def __init__(self):
       self._celsius = 0
   
   @property
   def celsius(self):
       return self._celsius
   
   @celsius.setter
   def celsius(self, value):
       self._celsius = value

转载请注明：周志洋的博客 » Python进阶-描述符协议