input - Caesar Cipher in python -

the error getting is

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' not defined 

below code.

# caesar cipher   max_key_size = 26  def getmode():     while true:         print('do wish encrypt or decrypt 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 message:')     return input()  def getkey():     key = 0     while true:         print('enter key number (1-%s)' % (max_key_size))         key = int(input())         if (key >= 1 , key <= max_key_size):             return key  def gettranslatedmessage(mode, message, key):     if mode[0] == 'd':         key = -key     translated = ''      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)) 

the problem here:

print('do wish encrypt or decrypt message?') mode = input().lower() 

in python 2.x input use raw_input() instead of input().

python 2.x:

• read string standard input: raw_input()
• read string standard input , evaluate it: input().

python 3.x:

• read string standard input: input()
• read string standard input , evaluate it: eval(input()).