server.py

import socket
import threading


class ClientThread(threading.Thread):
    def __init__(self, clientAddress, clientsocket):
        threading.Thread.__init__(self)
        self.csocket = clientsocket

    def run(self):
        print ("Connection from : ", clientAddress)
        self.csocket.send(bytes("Hi, This is from Server..", 'utf-8'))
        msg = ''
        while True:
            data = self.csocket.recv(2048)
            msg = data.decode()
            print ("from client", msg)
            self.csocket.send(bytes(msg, 'UTF-8'))


server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
server.bind(('localhost', 9999))
print("Server started")
print("Waiting for client request..")
while True:
    server.listen(1)
    clientsock, clientAddress = server.accept()
    newthread = ClientThread(clientAddress, clientsock)
    newthread.start()