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from __future__ import print_function

# The Caesar Cipher Algorithm

def main():

message = input("Enter message: ")

key = int(input("Key [1-26]: "))

mode = input("Encrypt or Decrypt [e/d]: ")

if mode.lower().startswith('e'):

mode = "encrypt"

elif mode.lower().startswith('d'):

mode = "decrypt"

translated = encdec(message, key, mode)

if mode == "encrypt":

print(("Encryption:", translated))

elif mode == "decrypt":

print(("Decryption:", translated))

def encdec(message, key, mode):

message = message.upper()

translated = ""

LETTERS = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"

for symbol in message:

if symbol in LETTERS:

num = LETTERS.find(symbol)

if mode == "encrypt":

num = num + key

elif mode == "decrypt":

num = num - key

if num >= len(LETTERS):

num -= len(LETTERS)

elif num < 0:

num += len(LETTERS)

translated += LETTERS[num]

else:

translated += symbol

return translated

if __name__ == '__main__':

import doctest

doctest.testmod()

main()

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