Question

我一直在试用这个Ceasar Cipher，我收到一个我似乎无法绕过的错误。我目前正在使用python36，并想知道是否有任何人可以让我知道为什么会出现未绑定的本地错误。谢谢！

#Ceasar Cipher
SYMBOLS = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'
MAX_KEY_SIZE = len(SYMBOLS)

def getMode():
    while True:
        print('Do you wish to ENCRYPT or DECRYPT a message?')
        mode = input().lower()
        if mode in ['encrypt', 'e', 'decrypt', 'd']:
            return mode
        else:
            print('Enter either "encrypt" or "e" or "decrypt" or "d".')

def getMessage():
    print('Enter your message:')
    return input()

def getKey():
    key = 0
    while True:
        print('Enter the key number (1-%s)' % (MAX_KEY_SIZE))
        key = int(input())
        if (key >= 1 and key <= MAX_KEY_SIZE):
            return key

def getTranslatedMessage(mode, message, key):
    if mode[0] == 'd':
        key = -key
    translated = ''

    for symbol in message:
        symbolIndex == SYMBOLS.find(symbol)
        if symbolIndex == -1: # Symbol not found in SYMBOLS.
            # Just add the symbol without any change.
            translated += symbol
        else:
            # Encrypt or decrypt.
            symbolIndex += key

            if symbolIndex >= len(SYMBOLS):
                symbolIndex -= len(SYMBOLS)
            elif symbolIndex < 0:
                symbolIndex += len(SYMBOLS)

            translated += SYMBOLS[symbolIndex]
    return translated

mode = getMode()
message = getMessage()
key = getKey()
print('Your translated text is:')
print(getTranslatedMessage(mode, message, key))

更新我收到的错误如下：

追踪（最近一次通话）：文件＆＃34; C：\ Users \ Badger \ Desktop \ DEV \ Scripts \ Ceasar_Cipher.py＆＃34;，第52行，in print（getTranslatedMessage（mode，message，key）） getTranslatedMessage中的文件＆＃34; C：\ Users \ Badger \ Desktop \ DEV \ Scripts \ Ceasar_Cipher.py＆＃34;，第32行 symbolIndex == SYMBOLS.find（symbol） UnboundLocalError：局部变量＆＃39; symbolIndex＆＃39;在分配前引用

Answer 1

Caesar Cipher的密钥将是1到26之间的数字。你的len（SYMBOLS）大于26。本代码使用python3

为我工作

MAX_KEY_SIZE = 26

def getMode():
     while True:

         print('Do you wish to encrypt or decrypt a message?')

         mode = raw_input().lower()

         if mode in 'encrypt e decrypt d'.split():

             return mode

         else:

             print('Enter either "encrypt" or "e" or "decrypt" or "d".')



def getMessage():

     print('Enter your message:')

     return raw_input()



def getKey():
     key = 0
     while True:

         print('Enter the key number (1-%s)' % (MAX_KEY_SIZE))

         key = int(input())

         if (key >= 1 and key <= MAX_KEY_SIZE):

             return key



def getTranslatedMessage(mode, message, key):

     if mode[0] == 'd':
         key = -key

     translated = ''



     for symbol in message:

         if symbol.isalpha():

             num = ord(symbol)
             num += key



             if symbol.isupper():

                 if num > ord('Z'):

                     num -= 26

                 elif num < ord('A'):

                     num += 26

             elif symbol.islower():

                 if num > ord('z'):

                     num -= 26
                 elif num < ord('a'):

                    num += 26


             translated += chr(num)
         else:

             translated += symbol

     return translated



mode = getMode()

message = getMessage()

key = getKey()
print('Your translated text is:')

print(getTranslatedMessage(mode, message, key))

Answer 2

我发现了什么问题......

我在分配时将symbolIndex设置为“==”。

将其改为“=”之后，一切都很美妙！

未绑定的本地错误Python密码

2 个答案: