循环失败 - 凯撒密码 [英] While Loop Fail - Caesar Cipher
问题描述
我有一个问题，当我要求我的程序退出它打印像我要求它，但显示我的选项菜单不断。
I'm having a problem where when I ask my program to quit out it prints like I ask it to, however shows my menu of options as well continuously.
所以我得到这个：
>>>
(S)huffle a message.
(U)nshuffle a message.
(Q)uit program.
Choose a option to begin: q
Goodbye!
(S)huffle a message.
(U)nshuffle a message.
(Q)uit program.
Choose a option to continue:
如果我选择' q'：
>>>
(S)huffle a message.
(U)nshuffle a message.
(Q)uit program.
Choose a option to begin: q
Goodbye!
这是我的完整代码，请解释为什么我的菜单重新打印，是否让我的while循环错误，或者是我的代码中的某些东西？
Here is my complete code, please explain why my menu is reprinting, did I make my while loop wrong, or is something out of place in my code?
def hw8():
print('(S)huffle a message.')
print('(U)nshuffle a message.')
print('(Q)uit program.')
x = input('Choose a option to begin: ')
if x == 'Q' or x == 'q':
print('Goodbye!')
while x != 'q' or 'Q' :
if x == 'S' or x == 's':
y = input('Enter a message to shuffle: ')
q1 = ''
for i in y:
if ord(i) in range(65,90) or ord(i) in range(97,122):
q = chr(ord(i) + 1)
q1 = q1 + q
elif ord(i) == 90:
q = chr(ord(i) + 7)
q1 = q1 + q
elif ord(i) == 122:
q = 'A'
q1 = q1 + q
else:
q = i
q1 = q1 + q
print(q1)
if x == 'U' or x == 'u':
f = input('Enter a message to unshuffle: ')
t2 = ''
for i in f:
if ord(i) in range (66,91) or ord(i) in range(98,123):
t = chr(ord(i) - 1)
t2 = t2 + t
elif ord(i) == 65:
t = 'z'
t2 = t2 + t
elif ord(i) == 97:
t = 'Z'
t2 = t2 + t
else:
t = i
t2 = t2 + t
print(t2)
print('(S)huffle a message.')
print('(U)nshuffle a message.')
print('(Q)uit program.')
x = input('Choose a option to continue: ')
hw8()
我希望程序洗牌后显示菜单，或清除消息，以及开始时，但不是在用户要求通过选择q退出程序之后。
I want the program to display the menu after shuffling a message, or unshuffling a message, as well as at the beginning, but not after the user has asked to quit the program by choosing 'q'.
编辑代码：
def hw8():
print('(S)huffle a message.')
print('(U)nshuffle a message.')
print('(Q)uit program.')
x = input('Choose a option to begin: ')
while x != 'q' or x != 'Q' :
if x == 'S' or x == 's':
y = input('Enter a message to shuffle: ')
q1 = ''
for i in y:
if ord(i) in range(65,90) or ord(i) in range(97,122):
q = chr(ord(i) + 1)
q1 = q1 + q
elif ord(i) == 90:
q = chr(ord(i) + 7)
q1 = q1 + q
elif ord(i) == 122:
q = 'A'
q1 = q1 + q
else:
q = i
q1 = q1 + q
print(q1)
if x == 'U' or x == 'u':
f = input('Enter a message to unshuffle: ')
t2 = ''
for i in f:
if ord(i) in range (66,91) or ord(i) in range(98,123):
t = chr(ord(i) - 1)
t2 = t2 + t
elif ord(i) == 65:
t = 'z'
t2 = t2 + t
elif ord(i) == 97:
t = 'Z'
t2 = t2 + t
else:
t = i
t2 = t2 + t
print(t2)
print('(S)huffle a message.')
print('(U)nshuffle a message.')
print('(Q)uit program.')
x = input('Choose a option to continue: ')
if x == 'Q' or x == 'q':
print('Goodbye!')
hw8()
新输出：
>>> ================================ RESTART ================================
>>>
(S)huffle a message.
(U)nshuffle a message.
(Q)uit program.
Choose a option to begin: s
Enter a message to shuffle: hello
ifmmp
(S)huffle a message.
(U)nshuffle a message.
(Q)uit program.
Choose a option to continue: q
Goodbye!
(S)huffle a message.
(U)nshuffle a message.
(Q)uit program.
Choose a option to continue:
推荐答案
问题是这一行：
while x != 'q' or 'Q' :
问题是 Q 本身将始终返回 True ，所以表达式将永远是真的。尝试更改行：
The problem is that Q itself will always return True, so the expression will always be true. Try changing the line with:
while x != 'q' and x != 'Q' :
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