from socket import *

 from time import ctime

 HOST = ''

 PORT = 9999

 BUFSIZ = 1024

 ADDR = (HOST, PORT)

 tcpSerSock = socket(AF_INET, SOCK_STREAM)   #创建套接字

 tcpSerSock.bind(ADDR)   #绑定IP和端口

 tcpSerSock.listen(5)    #监听端口，最多5人排队

 while True:

     print('waiting for connection...')

     tcpCliSock, addr = tcpSerSock.accept()    #建立连接

     print('...connected from:', addr)

     while True:

         data = tcpCliSock.recv(BUFSIZ)

         if not data:

             break

         content = '[%s] %s' % (bytes(ctime(), "utf-8"), data)

         print(data)

         print(type(content))

         tcpCliSock.send(content.encode("utf-8"))

     tcpCliSock.close()

 tcpSerSock.close()

 from socket import *

 HOST = '127.0.0.1'  # or 'localhost'

 PORT = 9999

 BUFSIZ = 1024

 ADDR = (HOST, PORT)

 tcpCliSock = socket(AF_INET, SOCK_STREAM)

 tcpCliSock.connect(ADDR)

 while True:

     data = input('> ')

     if not data:

         break

     tcpCliSock.send(data.encode("utf-8"))

     data = tcpCliSock.recv(BUFSIZ)

     if not data:

         break

     print(data.decode("utf-8"))

 tcpCliSock.close()