Python-сообщество

def tobit(s):
    for a in s:
        for i in xrange(8):
            if 1 << i & ord(a): yield 1
            else: yield 0

buf = 'abc'
#buf = open('file','rb').read()

for b in tobit(buf):
    print b,

1 0 0 0 0 1 1 0 0 1 0 0 0 1 1 0 1 1 0 0 0 1 1 0