[已解决]python 中add魔法方法重写

Mikil

1. class A(int):
   
2.     def __add__(self, other):
   
3.         return int.__add__(self, other)
   
4.     def __sub__(self, other):
   
5.         return int.__sub__(self, other)

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重写int方法时，上面是正确的，但是下面却是错误的

1. class A(int):
   
2.     def __add__(self, other):
   
3.         return super().__add__(self, other)
   
4.     def __sub__(self, other):
   
5.         return super().__sub__(self, other)

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1. a = A(2)
   
2. b = A(3)
   
3. 
   
4. a + b
   
5. 
   
6. TypeError: expected 1 arguments, got 2

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为什么不能使用super呢？

最佳答案

月排行榜 / 总排行榜

lirenbing01

2020-10-16 17:13:38

super() 函数是用于调用父类的
比如这样

1. class B(int):
   
2.     def __add__(self, other):
   
3.         return int.__add__(self, other)
   
4. 
   
5.     def __sub__(self, other):
   
6.         return int.__sub__(self, other)
   
7. 
   
8. 
   
9. class A(B):
   
10.     def __add__(self, other):
    
11.         return super().__add__(other)
    
12. 
    
13.     def __sub__(self, other):
    
14.         return super().__sub__(other)
    
15. 
    
16. 
    
17. if __name__ == '__main__':
    
18.     a = A(2)
    
19.     b = A(3)
    
20. 
    
21.     print(a + b)
    

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跳转到最佳答案楼层

lirenbing01

super() 函数是用于调用父类的
比如这样

1. class B(int):
   
2.     def __add__(self, other):
   
3.         return int.__add__(self, other)
   
4. 
   
5.     def __sub__(self, other):
   
6.         return int.__sub__(self, other)
   
7. 
   
8. 
   
9. class A(B):
   
10.     def __add__(self, other):
    
11.         return super().__add__(other)
    
12. 
    
13.     def __sub__(self, other):
    
14.         return super().__sub__(other)
    
15. 
    
16. 
    
17. if __name__ == '__main__':
    
18.     a = A(2)
    
19.     b = A(3)
    
20. 
    
21.     print(a + b)
    

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hrp

1. class A(int):
   
2.     def __add__(self, other):
   
3.         return super().__add__(other)
   
4.     def __sub__(self, other):
   
5.         return super().__sub__(other)
   
6.         
   
7. a=A(2)
   
8. b=A(3)
   
9. print(a+b)

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