Question

我遇到了一个问题，当我要求我的程序退出时，打印就像我要求的那样，但是不断显示我的选项菜单。

所以我得到了这个：

>>> 
(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'，我希望它显示在哪里：

>>> 
(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正在重新打印，我的while循环是否错误，或者我的代码中有什么不合适的地方？

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()

我希望程序在对消息进行随机播放或取消预设消息之后以及开始时显示菜单，但不是在用户通过选择“q”要求退出程序之后。

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:

Answer 1

x != 'q' or 'Q'正在处理(x != 'q') or 'Q'，而'Q'始终为True。

最好是： x not in 'qQ'或x.lower() != 'q'

Answer 2

你的问题就在这一行：

while x != 'q' or 'Q' :

问题是Q本身将始终返回True，因此表达式将始终为真。尝试使用以下内容更改该行：

while x != 'q' and x != 'Q' :

而循环失败 - 凯撒密码

2 个答案: