python的___setattr__魔方方法

 1 class Recangle:
 2     def __init__(self,width = 0,heigh = 0):
 3         self.width = width
 4         self.heigh = heigh
 5 
 6     def __setattr__(self,name,value):
 7         if name == 'square':
 8             self.width = value
 9             self.heigh = value
10         else:
11             print('else被执行了')
12             super().__setattr__(name,value)
13             
14 
15     def getArea(self):
16         return self.width * self.heigh
17 
18 a = Recangle(4,5)
19 print(a.getArea())
20 a.square = 10
21 print(a.getArea())
22 a.width = 100
23 print(a.getArea())
24 
25