tcp
服務端：
import socketserver

class MyHandler(socketserver.BaseRequestHandler):
    def handle(self):
        #通訊迴圈
        while True:
            # print(self.client_address)
            # print(self.request) #self.request = conn

            try:
                data=self.request.recv(1024)
                if len(data) == 0:break
 

                self.request.send(data.upper())
            except ConnectionResetError:
                break


if __name__ == '__main__':
    s=socketserver.ThreadingTCPServer(('127.0.0.1',8080),MyHandler,bind_and_activate=True)

    s.serve_forever()  # 代表連線迴圈
    # 迴圈建立連線，每建立一個連線就會啟動一個執行緒（服務員）+呼叫Myhanlder類產生一個物件，呼叫該物件下的handle方法，專門與剛剛建立好的連線做通訊迴圈
 


客戶端1：

import socket

phone=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
phone.connect(('127.0.0.1',8080)) # 指定服務端ip和埠

while True:
    # msg=input('>>: ').strip() #msg=''
    msg = 'client33333'  # msg=''
    if len(msg) == 0:continue
    phone.send(msg.encode('utf-8'))
    data=phone.recv(1024)
    print(data)
 



phone.close()

客戶端2：同客戶端1
...
udp
服務端：

import socketserver

class MyHandler(socketserver.BaseRequestHandler):
    def handle(self):
        #通訊迴圈
        # print(self.client_address)
        # print(self.request)

        data=self.request[0]
        print('客戶訊息',data)
        self.request[1].sendto(data.upper(),self.client_address)


if __name__ == '__main__':
    s=socketserver.ThreadingUDPServer(('127.0.0.1',8080),MyHandler)
    s.serve_forever()

客戶端：

import socket

client=socket.socket(socket.AF_INET,socket.SOCK_DGRAM) #資料報協議-》udp

while True:
    # msg=input('>>: ').strip() #msg=''
    msg='client444444'

    client.sendto(msg.encode('utf-8'),('127.0.0.1',8080))
    data,server_addr=client.recvfrom(1024)
    print(data)

client.close()