python aiuto

import string, time, socket, select, threading, signal, os, email, re


MAXRECVLEN = 1024  # dimensione del buffer per ricezione da rete """
LHOST = "192.168.1.53"  # IP locale su cui lavorare
TXTTL = 4  # TTL in trasmissione

running = 1
lastid = 0

d1['ID']        = "1"  # ID decoder
d1['RXMCAST']   = "239.192.0.1"  # RX multicast
d1['RXPORT']    = 1062  # RX UDP port

d2['ID']        = "2"  # ID decoder
d2['RXMCAST']   = "239.192.0.2"   # RX multicast
d2['RXPORT']    = 1062  # RX UDP port


""" classe ricevente """
class receiver(threading.Thread):
   def __init__ (self, ldecoder):
      threading.Thread.__init__(self)

      self.decoder = ldecoder
      self.msg = ''

      # receiver
      self.sr = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
      """ allow multiple sockets to use the same addr and port number """
      self.sr.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
      if hasattr(socket, "SO_REUSEPORT"):
         self.sr.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1)



   def run(self):
      global lastid
      writelog('II: Starting decoder n.' + str(self.decoder['ID']) + ' - ' + str(self.decoder['RXMCAST']) + ':' + str(self.decoder['RXPORT']))

      """ Bind to the port that we know will receive multicast data """
      self.sr.bind(('', self.decoder['RXPORT']))
      self.sr.setblocking(1)

      """ tell the kernel that we want to add ourselves to a multicast group """
      self.sr.setsockopt(socket.IPPROTO_IP, socket.IP_ADD_MEMBERSHIP, socket.inet_aton(self.decoder['RXMCAST']) + socket.inet_aton(LHOST))



      while running:
         self.chunk, self.addr = self.sr.recvfrom(MAXRECVLEN)

         if self.chunk == '':
            writelog('EE: error reading from socket')
            raise IOError

         self.msg += self.chunk
         if len(self.msg) == PKTSIZE:


            """
            if
            BLA BLA BLA BLA
            """

            self.msg = ''


   def close(self):
      self.sr.close()




def main():
   global running

   while 1:
      running = 1

      """ load decoders """
      if len(d2['RXMCAST']) > 5 and d2['RXPORT'] > 1024:
        recv2 = receiver(d2)
        recv2.daemon = True
        recv2.start()

      recv1 = receiver(d1)
      recv1.run()

      """
      except BLABLABLA
      """

if __name__ == '__main__':
    main()