socket server in python

      SocketServer uses IO multiplexing and "multi-threading" and "multi-process" internally, so as to realize the Socket server that processes multiple client requests concurrently. That is: When each client requests to connect to the server, the socket server will create a "thread" or "process" on the server, which is specially responsible for processing all requests of the current client.

1.ThreadingTCPServer -----------(for  threading)

The socket server implemented by ThreadingTCPServer will create a "thread" for each client, which is used to interact with the client

import socketserver

class MyTCPHander (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.sendall(self.data.upper())
            except ConnectionResetError as e:
                print("err", e)
                break
if __name__ == "__main__":
    HOST , PORT = "localhost" , 9999
 #MyTCPHander is the tcp processing function we wrote ourselves, which is a thread
 server = socketserver.ThreadingTCPServer((HOST , PORT) , MyTCPHander)        
    server.serve_forever()

Among them, in addition to inheriting from socketserver.BaseRequestHandler, the created class must define a method named handler