changes bit order in strings representing binary numbers (e.g. 0b001 --> 0b100)

bitorderchange.py

#!/usr/bin/python

bitstringlen = 8

import sys, re

regex = re.compile('(.*)0b([01]{2,8}),(.*)$');
for line in sys.stdin:
    if regex.match(line) is not None:
        bitstring = regex.match(line).group(2)
        num = int (bitstring, 2);
        revnum = int(('{:0%db}' % (len(bitstring))).format(num)[::-1], 2)
        print ("%s0b%s,%s" %  (regex.match(line).group(1), ('{:0%db}'%(bitstringlen)).format(revnum), regex.match(line).group(3)))
bitorderchange.py (END)