[已解决]一个小实验(x is y == True)

hveagle

1. >>> def is_True(demo):
   
2.         demo = demo + ' == True'
   
3.         result = eval(demo)
   
4.         if result == True:
   
5.                 print('Is True.')
   
6.         else:
   
7.                 print('Is False.')
   
8. 
   
9.        
   
10. >>> x = 'ABC'
    
11. >>> y = 'ABC'
    
12. >>> is_True('x is y')
    
13. Is False.
    
14. >>> def is_True(demo):
    
15.         demo = demo + ' == True'
    
16.         result = eval(demo)
    
17.         print(result)
    
18. 
    
19.        
    
20. >>> is_True('x is y')
    
21. False
    
22. >>> x is y == True
    
23. False
    
24. >>> x is y
    
25. True
    
26. >>>

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最佳答案

月排行榜 / 总排行榜

临时号

2022-10-15 10:54:27

运算符优先级的问题,==的优先级比is高,会先算'ABC' == True,在算'ABC' is False

1. >>> ('ABC' is 'ABC') == True
   
2. True

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临时号

运算符优先级的问题,==的优先级比is高,会先算'ABC' == True,在算'ABC' is False

1. >>> ('ABC' is 'ABC') == True
   
2. True

复制代码

hveagle

1. x is y == True
   
2. x is False
   
3. False

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