Yo coding. Turn a message into a sequence of 'yo's and 'yoyo's. Messages are encoded with ASCII and concatenated into a bit string. Each '1' is encoded as a 'yo' and each '0' encoded as a 'yoyo'.

yo_coding.py

from itertools import zip_longest

def encode(message):
    codepoints = list(map(ord, message))
    binary_strings = list(map(lambda x: '{0:08b}'.format(x), codepoints))
    binary_joined = ''.join(binary_strings)
    binary_spaced = binary_joined.replace('', ' ').strip()
    return binary_spaced.replace('1', 'yo').replace('0', 'yoyo')

def decode(message):
    binary_string = message.replace('yoyo', '0').replace('yo', '1').replace(' ','')
    binary_strings = map(lambda x: ''.join(x), grouper(binary_string, 8))
    codepoints = map(lambda x: int(x, 2), binary_strings)
    return ''.join(map(chr, codepoints))

def grouper(iterable, n, fillvalue=None):
    "Collect data into fixed-length chunks or blocks"
    # grouper('ABCDEFG', 3, 'x') --> ABC DEF Gxx"
    args = [iter(iterable)] * n
    return zip_longest(*args, fillvalue=fillvalue)