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))