import socket, traceback    host = ''  port = 51423    s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)  s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)  s.bind((host, port))    while 1:      try:          message, address = s.recvfrom(8192)          print 'Got data from', address          s.sendto(message, address)      except (KeyboardInterrupt, SystemExit):          raise      except:          traceback.print_exc()