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def rshift(s, bits, fill=0):
    if bits not in xrange(0, 9):
        raise Exception('bits must be within 0..8')
    len_carry = 8 - bits
    if isinstance(fill, str):
        fill = (ord(fill) << len_carry) & 255
    for c in s:
        v = ord(c)
        yield chr(v >> bits | fill)
        fill = (v << len_carry) & 255

if __name__ == '__main__':
    s = '12345'
    print ''.join(bin(ord(i))[2:].zfill(8) for i in s)
    print ''.join(bin(ord(i))[2:].zfill(8) for i in rshift(s, 1))
    # with rotation
    print ''.join(bin(ord(i))[2:].zfill(8) for i in rshift(s, 3, s[-1]))