gistfile1.py

def to_tbcd(binary_string):
    """
    tbcd decoding in one line 
    function takes argument in a form "0b10110101001" and translates it into a string 
    presentation of integer by tbcd standards
    http://en.wikipedia.org/wiki/Binary-coded_decimal#Telephony_Binary_Coded_Decimal_.28TBCD.29
    """
    return "".join(str(int(binary_string[index: index + 4], 2)) if int(binary_string[index + 4:index + 8], 2) == 15 else "%s%s" % (int(binary_string[index + 4:index + 8], 2), int(binary_string[index: index + 4], 2)) for index in range(2, len(binary_string), 8))