python中的凯撒密码 [英] Caesar Cipher in python

问题描述

我得到的错误是

Traceback (most recent call last):
  File "imp.py", line 52, in <module>
    mode = getMode()
  File "imp.py", line 8, in getMode
    mode = input().lower()
  File "<string>", line 1, in <module>
NameError: name 'encrypt' is not defined

下面是代码.

# Caesar Cipher


MAX_KEY_SIZE = 26

def getMode():
    while True:
        print('Do you wish to encrypt or decrypt a message?')
        mode = 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 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))

推荐答案

问题在这里:

print('Do you wish to encrypt or decrypt a message?')
mode = input().lower()

在Python 2.x输入中，使用raw_input()代替input().

In Python 2.x input use raw_input() instead of input().

Python 2.x:

Python 2.x:

• 从标准输入中读取字符串:raw_input()
• 从标准输入中读取一个字符串，然后对其进行评估:input().

• Read a string from standard input: raw_input()
• Read a string from standard input and then evaluate it: input().

Python 3.x:

Python 3.x:

• 从标准输入中读取字符串:input()
• 从标准输入中读取一个字符串，然后对其进行评估:eval(input()).

• Read a string from standard input: input()
• Read a string from standard input and then evaluate it: eval(input()).

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