python中利用socket模块来实现对各种底层通讯的封装，支持tcp/udp协议，为编制c/s类的程序提供了便利。

最常见的用法：

如ftp_server:

1 import socketserver 2 class Mysocketserver(socketserver.BaseRequestHandler): 3     def handle(self): 4         while True: 5             try: 6                 self.data=self.request.recv(1024).strip() 7                 print(self.client_address[0],'recv>>',self.data) 8                 self.request.send(self.data.upper()) 9             except Exception as e:10                 print("客户端关闭了！",e)11                 break12 ipaddr='localhost'13 port=999914 # server=socketserver.TCPServer((ipaddr,port),Mysocketserver)15 server=socketserver.ThreadingTCPServer((ipaddr,port),Mysocketserver)16 server.serve_forever()17 server.close_request()

ftp_client

1 import socket 2  3 client = socket.socket() 4 client.connect(('localhost', 9999)) 5 while True: 6     data = input(">>>>>>") 7     if len(data) == 0: continue 8     client.send(data.encode("utf-8")) 9     re_data = client.recv(1024)10     print(re_data)11 client.close()