client server two way communication using python socket

here, i wrote python source code for two way communication between client and server,
here server is the live server which is located in another network and client is local machine.

server.py

from socket import socket, AF_INET, SOCK_STREAM, SOL_SOCKET, SO_REUSEADDR
import thread
import time
import datetime

host = '0.0.0.0'       ### add server IP in place of 0.0.0.0
port = 1234
buf = 1024

addr = (host, port)

serversocket = socket(AF_INET, SOCK_STREAM)
serversocket.setsockopt(SOL_SOCKET, SO_REUSEADDR, 1)
serversocket.bind(addr)
serversocket.listen(10)

clients = [serversocket]

def handler(clientsocket, clientaddr):
    print "Accepted connection from: ", clientaddr
    while True:
        data = clientsocket.recv(1024)
        print "_" + data + "_"
        if data == "bye\n" or not data:
            break

   
        elif data == "client1\n":
            clientsocket.send("sending to client1 from server\n")

        elif "client2" in data:
            clientsocket.send("sending to client2 from server\n")

        else:
            clientsocket.send("ECHO: " + data + '\n')

    clients.remove(clientsocket)
    clientsocket.close()

def push():
    while True:
        for i in clients:
            if i is not serversocket: # neposilat sam sobe
                i.send("Curent date and time: " + str(datetime.datetime.now()) + '\n')
        time.sleep(10) # [s]


thread.start_new_thread(push, ())

while True:
    try:
        print "Server is listening for connections\n"
        clientsocket, clientaddr = serversocket.accept()
        clients.append(clientsocket)
        thread.start_new_thread(handler, (clientsocket, clientaddr))
    except KeyboardInterrupt:
        print "Closing server socket..."
        serversocket.close()

client.py

import socket

host = 'localhost'

port = 1234

buf = 1024

clientsocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

clientsocket.connect((host, port))

print "Sending 'client1 to server\\n'"

clientsocket.send('client1\n')

print "REPLY From Server: " + clientsocket.recv(buf)

print "Sending 'client2'"

clientsocket.send('client2')

print "REPLY From server: " + clientsocket.recv(buf)

print "Sending 'abc'"

clientsocket.send('abc')

print "REPLY From Server: " + clientsocket.recv(buf)

print "Sending 'abc'"

clientsocket.send('abc')

print "REPLY From Server: " + clientsocket.recv(buf)

print "Sending 'bye'"

clientsocket.send('bye\n')

print "REPLY From Server: " + clientsocket.recv(buf)

clientsocket.close()