class P:

     """

         property简单使用

     """

     def __init__(self,name):

         self._name = name

     @property

     def name(self):

         return self._name

     @name.setter

     def name(self,val):

         self._name = val

     @name.deleter

     def name(self):

         del self._name

 p = P("zhangsan")

 print(p.name)

 print(p.__dict__)

 p.name = "wangsi"

 print(p.name)

 print(p.__dict__)

 zhangsan

 {'_name': 'zhangsan'}

 wangsi

 {'_name': 'wangsi'}

 class Property:

     def __init__(self,fget=None,fset=None,fdel=None):

         self.fget = fget

         self.fset = fset

         self.fdel = fdel

         pass

     def __set__(self, instance, value):

         self.fset(instance,value)

         return self

     def __get__(self, instance, owner):

         if not instance:

             return self

         return self.fget(instance)

     def __delete__(self, instance):

         self.fdel(instance)

         return self

     def setter(self,fn):

         #保留设置函数的副本

         self.fset = fn

         return self

     def deleter(self,fn):

         # 保留删除函数的副本

         self.fdel = fn

         return self

 class Person:

     # d = Property()

     def __init__(self,data):

         self._data = data

     @Property   #等价式  data=Propery(data)

     def data(self):

         return self._data

     @data.setter   #等价式  data=data.setter(data)

     def data(self,val):

         self._data = val

     @data.deleter  #等价式  data=data.deleter(data)

     def data(self):

         del self._data

 p = Person(19)

 p.data = 123

 print(Person.__dict__)

 print(p.__dict__)

 del p.data

 print(Person.__dict__)

 print(p.__dict__)

 {'__init__': <function Person.__init__ at 0x0000015F3F0F0598>, '__dict__': <attribute '__dict__' of 'Person' objects>, 'data': <__main__.Property object at 0x0000015F3F0FE240>, '__weakref__': <attribute '__weakref__' of 'Person' objects>, '__module__': '__main__', '__doc__': None}

 {'_data': 123}

 {'__init__': <function Person.__init__ at 0x0000015F3F0F0598>, '__dict__': <attribute '__dict__' of 'Person' objects>, 'data': <__main__.Property object at 0x0000015F3F0FE240>, '__weakref__': <attribute '__weakref__' of 'Person' objects>, '__module__': '__main__', '__doc__': None}

 {}