gistfile1.py

def unpack_string(octet_string):
    ret = []
    for hex in octet_string.split(' '):
        octets = struct.unpack('2c', hex)
        for octet in octets:
            b_repr = bin(int(octet, 16)).replace('b','')
            ret.append( b_repr.ljust(4, '0'))
    return [b[0]+1 for b in enumerate([a for a in "".join(ret)]) if b[1] == '1']