python的单线程多任务的实现

# coding:utf-8

from socket import *

# 1.创建服务器socket

sock = socket(AF_INET, SOCK_STREAM)

# 2.绑定主机和端口

addr = ('', 7788) #

sock.bind(addr)

# 3. 设置最大监听数目，并发

sock.listen(10)

# 4. 设置成非阻塞

sock.setblocking(False)

# 保存客户端socket

clientAddrList = []

# print(sock.)

while 1:

  try:

    clientSocket, clientAddr = sock.accept()

  except:

    pass

  else:

    print("一个新客户端到来：%s" % str(clientAddr))

    clientSocket.setblocking(False)

    clientAddrList.append((clientSocket, clientAddr))

  for clientSocket, clientAddr in clientAddrList:

    try:

      recvData = clientSocket.recv(1024)

    except:

      pass

    else:

      if len(recvData) > 0:

        print("%s:%s" % (str(clientAddr), recvData))

      else:

        clientSocket.close()

        clientAddrList.remove((clientSocket, clientAddr))

        print("%s 已经下线" % str(clientAddr))