In [8]: class Rectangle:
   ...:     def __init__(self, width, height):
   ...:         self.width = width
   ...:         self.height = height
   ...:     def setsize(self, size):
   ...:         self.width, self.height = size
   ...:     def getsize(self):
   ...:         return self.width, self.height
   ...:     def delsize(self):
   ...:         self.width, self.height = 0, 0
   ...:     size = property(getsize, setsize, delsize, '用
   ...: 于描述矩形大小的属性')
   ...: