Python UDP程序与select的多个连接

Question

I'm making a UDP program that connects multiple clients/neighbors. There is no server everyone is using the same program. I'm trying to test it with localhost so consider all IPs and ports of neighbors work as intended. Using 127.0.0.1 as IP on all and connecting to different ports. So my question is why do I receive the startup data that I send before the while loop but I cannot send any? Seems that I am doing something wrong with sys.stdin.

s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.bind((HOST, PORT))
going = True

input = [s]
while going:

  i,o,e = select.select(input,[],[],)
  try :
    for x in i:
      if x == sys.stdin: 
        data = sys.stdin.read()
        for i in neighbors:
          addr = (i[1][0], int(i[1][1]))
          s.sendto(data, addr)
      else:
        msg, addr = s.recvfrom(100)
        print msg
  except socket.error, msg:
    print 'Error Code : ' + str(msg[0]) + ' Message ' + msg[1]
    sys.exit()   
s.close()

Answer 1

input is always [s] , so i is always going to be [s] , so x == sys.stdin is never going to be True (because x is always s ), so only the else clause will ever execute.

Maybe you meant input = [s, sys.stdin] ?