python课后52求助

名字是啥

class A:
    def __init__(self, a, b, c):
        self.x = a + b + c

a = A(1,2,3)
b = getattr(a, 'x')
setattr(a, 'x', b+1)
print(a.x)

为什么最后打印出来是7

逃兵

就是简单的更改了a.x的值

1. 
   
2. class A:
   
3.     def __init__(self, a, b, c):
   
4.         self.x = a + b + c
   
5. 
   
6. a = A(1,2,3)
   
7. b = getattr(a, 'x') #返回a.x
   
8. setattr(a, 'x', b+1) #将a.x的值重新赋值为b+1
   
9. print(a.x)

复制代码