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一、描述符（将某种特殊类型的类的实例指派给另一个类的属性）
__get__(self, instance, owner): 用于访问属性，它返回属性的值
__set__(self, instance, value): 将在属性分配操作中调用，不返回任何内容
—delelte__(self, instance): 控制删除操作，不返回任何内容
二、描述符代码
class MyDecriptor:
def __get__(self, instance, owner):
print("getting...", self, instance, owner)
def __set__(self, instance, value):
print("setting...", self, instance, value)
def __delete__(self, instance):
print("deleting...", self, instance)
class Test:
x=MyDecriptor()
class Myproperty:
def __init__(self, fget=None, fset=None, fdel=None):
self.fget=fget
self.fset=fset
self.fdel=fdel
def __get__(self, instance, owner):
return self.fget(instance)
def __set__(self, instance, value):
self.fset(instance, value)
def __del__(self, instance):
self.fdel(instance)
class C:
def __init__(self):
self._x=None
def getX(self):
return self._x
def setX(self, value):
self._x=value
def delX(self):
__delete__self._x
x=Myproperty(getX, setX, delX)
三、实例温度计
class Celsius:
def __init__(self, value =26.0):
self.value = float(value)
def __get__(self, instance, owner):
return self.value
def __set__(self, instance, value):
self.value =float(value)
class Fahrenheit:
def __get__(self, instance, owener):
return instance.cel * 1.8 + 32
def __set__(self, instance, value):
instance.cel=(float(value)-32)/1.8
class Temperature:
cel = Celsius()
fah = Fahrenheit()
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原文：https://www.cnblogs.com/gdy123/p/9784761.html