my annouce function

gistfile1.py

def announce(self, torrent):
        """Returns data from Tracker specified in torrent"""
        announce_query_params = {
            'info_hash' : torrent.info_hash,
            'peer_id' : self.client_id,
            'port' : self.port,
            'uploaded' : 0,
            'downloaded' : 0,
            'left' : torrent.length,
            'compact' : 1, # sometimes optional
           #'no_peer_id' :  # ignored if compact enabled
            'event' : 'started',
            #'ip' : ip # optional
            #'numwant' : 50 # optional
            #'trackerid' : tracker id, if included before # optional
        }

        addr = torrent.announce_url
        full_url = addr + '?' + urllib.urlencode(announce_query_params)
        print 'opening', full_url, '...'
        response_data = bencode.bdecode(urllib.urlopen(full_url).read())

        peers_data = response_data['peers']
        peer_addresses = []
        for sixbits in [peers_data[i:i+6] for i in range(0,len(peers_data),6)]:
            peer_addresses.append(('.'.join(str(ord(ip_part)) for ip_part in sixbits[:4]), 256*ord(sixbits[4])+ord(sixbits[5])))

        #TODO fill out with our listening addr if we can filter it out
        our_ip = '127.0.0.1'
        peer_addresses = [x for x in peer_addresses if x[0] != our_ip or x[1] != self.port]
        response_data['peers'] = peer_addresses
        return response_data