在Python中检查套接字中是否有可用数据

Question

我希望有一种功能来检查套接字中是否等待读取的数据，然后再进行读取。类似这样的东西会很有帮助：

if (data available) then read data

else wait in blocking mode till data becomes available

我该如何在Python中实现这个？

- Vivek V K

---

这就是 select 系统调用为您所做的事情。https://docs.python.org/2.7/library/select.html - squiguy

@squiguy，你能给我一个小例子吗？ - Vivek V K

Answer 1

while 1:
  socket_list = [sys.stdin, s]
  # Get the list sockets which are readable
  read_sockets, write_sockets, error_sockets = select.select(socket_list , [], [])
  for sock in read_sockets:
   #incoming message from remote server
   if sock == s:
      data = sock.recv(4096)
      if not data :
        print '\nDisconnected from server'
        sys.exit()
      else :
         #print data
         sys.stdout.write(data)


   #user entered a message
   else :
     msg = sys.stdin.readline()
     s.send(msg)

- Nandha Kumar