Blizzard downloader torrent extractor

#!/usr/bin/env python

import os, re, struct

def get_torrent(data):
    start = data.find("d8:")
    end = data[start:].find("PSER")
    return data[start:start+end]

if __name__ == '__main__':
    for fname in os.listdir('.'):
        if re.search('^Downloader_.*.exe$', fname):
            tname = re.sub('^Downloader_(.*).exe$', '\\1.torrent', fname)
            try:
                fdata = open(fname).read()
                tdata = get_torrent(fdata)
                f = open(tname, 'wb')
                f.write(tdata)
                f.close()
                print "Extracted torrent from '%s' to '%s'" % (fname, tname)
            except Exception, e:
                print "Could not extract torrent from '%s': %s" % (fname, e)