CeaserCipher.py

import string
alphabet = ' '+ string.ascii_lowercase
count = 0
positions=dict()
for a in alphabet:
	positions[a] = count
	count = count + 1

def shift_encode(message,key):
    encoding_list = []
    for char in message:
        position = positions[char]
        encoded_position = (position + key) % 27
        encoding_list.append(alphabet[encoded_position])
    encoded_string = "".join(encoding_list)
    return encoded_string

encoded_message = shift_encode(message,3)
print(encoded_message)

decode_message = shift_encode(encoded_message, -3)
print(decode_message)