SGS Caesar Cipher | Python Fiddle

#!/bin/python
 
'''
Caesar Cipher here inclusive of basic punctuation where.
a to z = 1 to 26
space = 27
comma = 28
period = 29
 
You can also decode a message by making your key its
negative equivalent upon input.
 
 
By smartgrowthsolutions.com.au on the 22/03/2014
 
'''
 
from collections import deque as numbers
from string import ascii_lowercase as alphabet
 
def rosetta_stone(key):
    r = numbers(range(1,30))
    r.rotate(key)
    r = list(r)
    return dict(zip(alphabet + ' ' + ',' + '.',r))
 
def enumerate(message, key):
    output = []
    code = []
    cipher = rosetta_stone(key)
    for character in message:
        for key, value in cipher.items():
            if character is key:
                output.append(value)
    return output
 
def encode(message, key):
    output = []
    code = enumerate(message, key)
    r = rosetta_stone(0)
    for number in code:
        for key, value in r.items():
            if number is value:
                output.append(key)
    return output
 
message = raw_input('Message: ')
key = int(raw_input('Key: '))
 
encoded_message = ''.join(encode(message, key))
 
print 'Your code is:', encoded_message
print 'Your key was: ', key

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