Question

这是我的循环：

sure = input('Are you sure that you wish to reset the program?(y/n)')
while sure != 'y' or sure != 'n':
    sure = input('Please awnser y or n, Are you sure that you wish to reset the program?(y/n)')

即使输入了y或n，循环也会继续循环播放。

Answer 1

将条件更改为

while sure != 'y' and sure != 'n':

无论他们输入什么，您写的条件总是为True。另一种选择是

while sure not in ('y','n'):

Answer 2

您需要and代替or。在执行or时，如果确定不是y n，它将继续循环，但肯定不能同时进行，因此它会永远循环。

示例 -

sure = input('Are you sure that you wish to reset the program?(y/n)')
while sure != 'y' and sure != 'n':
    sure = input('Please awnser y or n, Are you sure that you wish to reset the program?(y/n)')

Answer 3

问题在于你的逻辑表达式：

sure != 'y' or sure != 'n'

使用德摩根定律，这可以改为：

!(sure == 'y' and sure == 'n')

显然，sure永远不能 'y'和'n'，所以这不起作用。你想要的是：

sure != 'y' and sure != 'n'

Python while循环使用或不提供已消耗的输出

3 个答案: