建立一個socketserver 

1.建立一個請求的類，必須是BaseRequestsHandler 的子類。並且要重寫父類裡面的handle()方法

2.必須實列化一個server class ，並且傳遞server ip和你建立的請求處理類給這個server class

3.server.server_forever() 處理多個請求·，永遠執行

import socketserver

class MyTcpHandler(socketserver.BaseRequestHandler):
    """建立 繼承 重寫"""

    def
 
 handle(self):  # 與客戶端互動
        while True:
            try:
                self.data = self.request.recv(1024).strip()
                print("{} wrote:".format(self.client_address[0]))
                print(self.data)
                # if not self.data: # 客戶端斷開
                #     print(self.client_address,"斷開了")
 

                #     break

                self.request.sendall(self.data.upper())
            except ConnectionResetError as e:
                print("error:",e)
                break

if __name__ == "__main__":
    HOST,PORT = "localhost",3339
    server = socketserver.TCPServer((HOST,PORT),MyTcpHandler)
    server.serve_forever()
 

import socket
import hashlib

client = socket.socket()
client.connect(('localhost',3339))

while True:
    cmd = input(">>:").strip()
    if len(cmd) == 0: continue
    client.send(cmd.encode('utf-8'))
    data = client.recv(1024)
    print(data.decode())

client.close()