def s2b ( s ) : ret = [ ] for c in s : ret . append ( bin ( ord ( c ) ) [ 2 : ] . zfill ( 8 ) ) return "" . join ( ret )
b' b python to string
String to binary .
def s2b(s):
    """
    String to binary.
    """
    ret = []
    for c in s:
        ret.append(bin(ord(c))[2:].zfill(8))
    return "".join(ret)