目前正在学Python网络编程基础，发觉Python是一个不错的脚步，Python写的服务器代码区区20行左右，如果是C或者C++写的话，远不止这个数了。

#!usr/bin/python

import socket

host=''
port=51423

s=socket.socket (socket.AF_INET ,socket.SOCK_STREAM)
s.setsockopt(socket.SOL_SOCKET ,socket.SO_REUSEADDR ,1)
s.bind((host,port))
s.listen(1)

print"Server is running on port %d ;Press Ctrl-c to terminate." % port

while 1:
    clientsock,clientaddr=s.accept()
    clientfile=clientsock.makefile('rw',0)
    clientfile.write("welcome ,"+str(clientaddr)+"\n" )
    clientfile.write("Please enter a string:")
    clientfile.write("\n")
    line=clientfile.readline().strip()
    clientfile.write("You entered string is:%s .\n"%line)
    clientfile.close()
    clientsock.close()