week2_question4.py

from util import groupBy

_4b5bmap = {'11110':'0000',
           '01001':'0001',
           '11100':'1110',
           '11101':'1111'}
#"are pre-determined in a dictionary and they are chosen to ensure that there will be at least two transitions per block of bits."
#TODO: Get the whole map from http://www.mathworks.com/matlabcentral/fileexchange/27566-4b5b-encoder-line-codificador-de-linea-4b5b/ ?

def translate4b5b(bits):
    return [_4b5bmap.get(_5) for _5 in groupBy(bits,5)]

print(''.join(translate4b5b('1110011110')))