[已解决]一个小实验(x is y == True)

hveagle

>>> def is_True(demo):
        demo = demo + ' == True'
        result = eval(demo)
        if result == True:
                print('Is True.')
        else:
                print('Is False.')

        
>>> x = 'ABC'
>>> y = 'ABC'
>>> is_True('x is y')
Is False.
>>> def is_True(demo):
        demo = demo + ' == True'
        result = eval(demo)
        print(result)

        
>>> is_True('x is y')
False
>>> x is y == True
False
>>> x is y
True
>>> 

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

>>> ('ABC' is 'ABC') == True
True

跳转到最佳答案楼层

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

>>> ('ABC' is 'ABC') == True
True

hveagle

x is y == True
x is False
False