readable, writable, exceptional = select.select(inputs, outputs, inputs)

# coding: utf-8import selectimport socketimport Queuefrom time import sleep# Create a TCP/IPserver = socket.socket(socket.AF_INET, socket.SOCK_STREAM)server.setblocking(False)# Bind the socket to the portserver_address = ('localhost', 8090)print ('starting up on %s port %s' % server_address)server.bind(server_address)# Listen for incoming connectionsserver.listen(5)# Sockets from which we expect to readinputs = [server]# Sockets to which we expect to write# 處理要發(fā)送的消息outputs = []# Outgoing message queues (socket: Queue)message_queues = {}while inputs:  # Wait for at least one of the sockets to be ready for processing  print ('waiting for the next event')  # 開(kāi)始select 監(jiān)聽(tīng), 對(duì)input_list 中的服務(wù)器端server 進(jìn)行監(jiān)聽(tīng)  # 一旦調(diào)用socket的send, recv函數(shù)，將會(huì)再次調(diào)用此模塊  readable, writable, exceptional = select.select(inputs, outputs, inputs)  # Handle inputs  # 循環(huán)判斷是否有客戶端連接進(jìn)來(lái), 當(dāng)有客戶端連接進(jìn)來(lái)時(shí)select 將觸發(fā)  for s in readable:    # 判斷當(dāng)前觸發(fā)的是不是服務(wù)端對(duì)象, 當(dāng)觸發(fā)的對(duì)象是服務(wù)端對(duì)象時(shí),說(shuō)明有新客戶端連接進(jìn)來(lái)了    # 表示有新用戶來(lái)連接    if s is server:      # A "readable" socket is ready to accept a connection      connection, client_address = s.accept()      print ('connection from', client_address)      # this is connection not server      connection.setblocking(0)      # 將客戶端對(duì)象也加入到監(jiān)聽(tīng)的列表中, 當(dāng)客戶端發(fā)送消息時(shí) select 將觸發(fā)      inputs.append(connection)      # Give the connection a queue for data we want to send      # 為連接的客戶端單獨(dú)創(chuàng)建一個(gè)消息隊(duì)列，用來(lái)保存客戶端發(fā)送的消息      message_queues[connection] = Queue.Queue()    else:      # 有老用戶發(fā)消息, 處理接受      # 由于客戶端連接進(jìn)來(lái)時(shí)服務(wù)端接收客戶端連接請(qǐng)求，將客戶端加入到了監(jiān)聽(tīng)列表中(input_list), 客戶端發(fā)送消息將觸發(fā)      # 所以判斷是否是客戶端對(duì)象觸發(fā)      data = s.recv(1024)      # 客戶端未斷開(kāi)      if data != '':        # A readable client socket has data        print ('received "%s" from %s' % (data, s.getpeername()))        # 將收到的消息放入到相對(duì)應(yīng)的socket客戶端的消息隊(duì)列中        message_queues[s].put(data)        # Add output channel for response        # 將需要進(jìn)行回復(fù)操作socket放到output 列表中, 讓select監(jiān)聽(tīng)        if s not in outputs:          outputs.append(s)      else:        # 客戶端斷開(kāi)了連接, 將客戶端的監(jiān)聽(tīng)從input列表中移除        # Interpret empty result as closed connection        print ('closing', client_address)        # Stop listening for input on the connection        if s in outputs:          outputs.remove(s)        inputs.remove(s)        s.close()        # Remove message queue        # 移除對(duì)應(yīng)socket客戶端對(duì)象的消息隊(duì)列        del message_queues[s]  # Handle outputs  # 如果現(xiàn)在沒(méi)有客戶端請(qǐng)求, 也沒(méi)有客戶端發(fā)送消息時(shí), 開(kāi)始對(duì)發(fā)送消息列表進(jìn)行處理, 是否需要發(fā)送消息  # 存儲(chǔ)哪個(gè)客戶端發(fā)送過(guò)消息  for s in writable:    try:      # 如果消息隊(duì)列中有消息,從消息隊(duì)列中獲取要發(fā)送的消息      message_queue = message_queues.get(s)      send_data = ''      if message_queue is not None:        send_data = message_queue.get_nowait()      else:        # 客戶端連接斷開(kāi)了        print "has closed "    except Queue.Empty:      # 客戶端連接斷開(kāi)了      print "%s" % (s.getpeername())      outputs.remove(s)    else:      # print "sending %s to %s " % (send_data, s.getpeername)      # print "send something"      if message_queue is not None:        s.send(send_data)      else:        print "has closed "      # del message_queues[s]      # writable.remove(s)      # print "Client %s disconnected" % (client_address)  # # Handle "exceptional conditions"  # 處理異常的情況  for s in exceptional:    print ('exception condition on', s.getpeername())    # Stop listening for input on the connection    inputs.remove(s)    if s in outputs:      outputs.remove(s)    s.close()    # Remove message queue    del message_queues[s]  sleep(1)

# coding: utf-8import socketmessages = ['This is the message ', 'It will be sent ', 'in parts ', ]server_address = ('localhost', 8090)# Create aTCP/IP socketsocks = [socket.socket(socket.AF_INET, socket.SOCK_STREAM), socket.socket(socket.AF_INET, socket.SOCK_STREAM), ]# Connect thesocket to the port where the server is listeningprint ('connecting to %s port %s' % server_address)# 連接到服務(wù)器for s in socks:  s.connect(server_address)for index, message in enumerate(messages):  # Send messages on both sockets  for s in socks:    print ('%s: sending "%s"' % (s.getsockname(), message + str(index)))    s.send(bytes(message + str(index)).decode('utf-8'))  # Read responses on both socketsfor s in socks:  data = s.recv(1024)  print ('%s: received "%s"' % (s.getsockname(), data))  if data != "":    print ('closingsocket', s.getsockname())    s.close()