client.py

import socket 
import select 
import sys
server = socket.socket(socket.AF_INET, socket.SOCK_STREAM) 
if len(sys.argv) != 3: 
    print ("Correct usage: script, IP address, port number")
    exit() 
IP_address = str(sys.argv[1]) 
Port = int(sys.argv[2]) 
server.connect((IP_address, Port)) 
  
while True: 
  
    # maintains a list of possible input streams 
    sockets_list = [sys.stdin, server] 
  
    """ There are two possible input situations. Either the 
    user wants to give  manual input to send to other people, 
    or the server is sending a message  to be printed on the 
    screen. Select returns from sockets_list, the stream that 
    is reader for input. So for example, if the server wants 
    to send a message, then the if condition will hold true 
    below.If the user wants to send a message, the else 
    condition will evaluate as true"""
    read_sockets,write_socket, error_socket = select.select(sockets_list,[],[]) 
  
    for socks in read_sockets: 
        if socks == server: 
            message = socks.recv(1024) 
            print (message.decode('ASCII'))
        else: 
            message = sys.stdin.readline() 
            server.send(bytes(message,'utf-8')) 
            sys.stdout.write("<You>") 
            sys.stdout.write(message)
            sys.stdout.flush() 
server.close()