python-- socketServer

import socket
client = socket.socket()
client.connect(('localhost', 9999))
while True:
    msg = input('>>>>:').strip()
    if len(msg) == 0:
        continue
    client.send(msg.encode('utf-8'))
    data = client.recv(1024)
    print("recv:", data.decode())
client.close()

import socketserver
class MyTcpHandler(socketserver.BaseRequestHandler):
    def handle(self):
        while True:
            try:
                self.data = self.request.recv(1024).strip()
                print("{} wrote:".format(self.client_address[0]))
                print(self.data)
                self.request.send(self.data.upper())
            except ConnectionResetError as e:
                print('err', e)
                break
if __name__ == "__main__":
    HOST, PORT = 'localhost', 9999
    server = socketserver.TCPServer((HOST, PORT), MyTcpHandler)
    server.serve_forever()

import socket
client = socket.socket()
client.connect(('localhost', 9999))
while True:
    msg = input('>>>>:').strip()
    if len(msg) == 0:
        continue
    client.send(msg.encode('utf-8'))
    data = client.recv(1024)
    print("recv:", data.decode())
client.close()

import socketserver
class MyTcpHandler(socketserver.BaseRequestHandler):
    def handle(self):
        while True:
            try:
                self.data = self.request.recv(1024).strip()
                print("{} wrote:".format(self.client_address[0]))
                print(self.data)
                self.request.send(self.data.upper())
            except ConnectionResetError as e:
                print('err', e)
                break
if __name__ == "__main__":
    HOST, PORT = 'localhost', 9999
    server = socketserver.ThreadingTCPServer((HOST, PORT), MyTcpHandler)
    server.serve_forever()