# 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') # 開始select 監聽, 對input_list 中的服務器端server 進行監聽 # 一旦調用socket的send, recv函數，將會再次調用此模塊 readable, writable, exceptional = select.select(inputs, outputs, inputs) # Handle inputs # 循環判斷是否有客戶端連接進來, 當有客戶端連接進來時select 將觸發 for s in readable:  # 判斷當前觸發的是不是服務端對象, 當觸發的對象是服務端對象時,說明有新客戶端連接進來了  # 表示有新用戶來連接  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)   # 將客戶端對象也加入到監聽的列表中, 當客戶端發送消息時 select 將觸發   inputs.append(connection)   # Give the connection a queue for data we want to send   # 為連接的客戶端單獨創建一個消息隊列，用來保存客戶端發送的消息   message_queues[connection] = Queue.Queue()  else:   # 有老用戶發消息, 處理接受   # 由于客戶端連接進來時服務端接收客戶端連接請求，將客戶端加入到了監聽列表中(input_list), 客戶端發送消息將觸發   # 所以判斷是否是客戶端對象觸發   data = s.recv(1024)   # 客戶端未斷開   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應的socket客戶端的消息隊列中    message_queues[s].put(data)    # Add output channel for response    # 將需要進行回復操作socket放到output 列表中, 讓select監聽    if s not in outputs:     outputs.append(s)   else:    # 客戶端斷開了連接, 將客戶端的監聽從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    # 移除對應socket客戶端對象的消息隊列    del message_queues[s] # Handle outputs # 如果現在沒有客戶端請求, 也沒有客戶端發送消息時, 開始對發送消息列表進行處理, 是否需要發送消息 # 存儲哪個客戶端發送過消息 for s in writable:  try:   # 如果消息隊列中有消息,從消息隊列中獲取要發送的消息   message_queue = message_queues.get(s)   send_data = ''   if message_queue is not None:    send_data = message_queue.get_nowait()   else:    # 客戶端連接斷開了    print "has closed "  except Queue.Empty:   # 客戶端連接斷開了   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()