import socketimport tracebackimport selectEOL1 = b'/n/n'EOL2 = b'/n/r/n'socketmap = {}r,w,e = [],[],[]response = b'HTTP/1.0 200 OK/r/nDate: Mon, 1 Jan 1996 01:01:01 GMT/r/n'response += b'Content-Type: text/plain/r/nContent-Length: 13/r/n/r/n'response += b'Hello, world!'serversocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)serversocket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)serversocket.bind(('0.0.0.0', 23456))serversocket.listen(1)#serversocket.setblocking(0)listening_fileno = serversocket.fileno()socketmap[listening_fileno] = serversocketprint 'listening_fileno',listening_filenotry:  while True:    r,w,e = [],[],[]    for fd in socketmap:      r.append(fd)      w.append(fd)      e.append(fd)    r,w,e = select.select(r,w,e,1)    for fd in r:      request = b''      isocket = socketmap[fd]      if fd == listening_fileno:        print 'accepting'        clientsock,clientaddr = isocket.accept()        #clientsock.setblocking(0)        cli_fileno = clientsock.fileno()        r.append(cli_fileno)        w.append(cli_fileno)        e.append(cli_fileno)        socketmap[cli_fileno] = clientsock      else:        print 'reading'        while EOL1 not in request and EOL2 not in request:          request += isocket.recv(1024)        print(request.decode())    for fd in w:      print 'writing'      osocket = socketmap[fd]      osocket.send(response)    for fd in e:      esocket = socketmap[fd]      print 'socket close',fd      esocket.close()      del socketmap[fd]    print "no data coming"except Exception,e:  print traceback.print_exc()  serversocket.close()