encoder.py

import sys

pair_table = {
    "a" : ("", 1),
    "b" : ("", 2),
    "c" : ("", 3),
    "d" : ("", 4),
    "e" : ("", 5),
    "f" : ("", 6),
    "g" : ("", 7),
    "h" : ("", 8),
    "i" : ("", 9),
    "j" : ("", 10),
    "k" : ("b", 1),
    "l" : ("b", 2),
    "m" : ("b", 3),
    "n" : ("b", 4),
    "o" : ("b", 5),
    "p" : ("b", 6),
    "q" : ("b", 7),
    "r" : ("b", 8),
    "s" : ("b", 9),
    "t" : ("b", 10),
    "u" : ("c", 1),
    "v" : ("c", 2),
    "w" : ("c", 3),
    "x" : ("c", 4),
    "y" : ("c", 5),
    "z" : ("c", 6),
}

def is_not_allowed(char):
    return char in [" ", ",", ".", ";", "-"]

def encode_message(str):
    encoded = ""

    for char in str:
        if is_not_allowed(char):
            encoded += " "
            continue

        pair = pair_table[char]
        emoji = pair_to_emoji(pair)
        encoded += emoji

    return encoded

def pair_to_emoji(pair):
    letter = pair[0]
    number = str(pair[1])
    return ":encoded" + letter + number + ": "

message = sys.argv[1:][0].lower()
encoded = encode_message(message)
print(encoded)