how to make chat box using python

1#Server Script
2import socket 
3import select 
4import sys 
5from thread import *
6
7"""The first argument AF_INET is the address domain of the 
8socket. This is used when we have an Internet Domain with 
9any two hosts The second argument is the type of socket. 
10SOCK_STREAM means that data or characters are read in 
11a continuous flow."""
12server = socket.socket(socket.AF_INET, socket.SOCK_STREAM) 
13server.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) 
14
15# checks whether sufficient arguments have been provided 
16if len(sys.argv) != 3: 
17	print("Correct usage: script, IP address, port number")
18	exit() 
19
20# takes the first argument from command prompt as IP address 
21IP_address = str(sys.argv[1]) 
22
23# takes second argument from command prompt as port number 
24Port = int(sys.argv[2]) 
25
26""" 
27binds the server to an entered IP address and at the 
28specified port number. 
29The client must be aware of these parameters 
30"""
31server.bind((IP_address, Port)) 
32
33""" 
34listens for 100 active connections. This number can be 
35increased as per convenience. 
36"""
37server.listen(100) 
38
39list_of_clients = [] 
40
41def clientthread(conn, addr): 
42
43	# sends a message to the client whose user object is conn 
44	conn.send("Welcome to this chatroom!") 
45
46	while True: 
47			try: 
48				message = conn.recv(2048) 
49				if message: 
50
51					"""prints the message and address of the 
52					user who just sent the message on the server 
53					terminal"""
54					print("<" + addr[0] + "> " + message )
55
56					# Calls broadcast function to send message to all 
57					message_to_send = "<" + addr[0] + "> " + message 
58					broadcast(message_to_send, conn) 
59
60				else: 
61					"""message may have no content if the connection 
62					is broken, in this case we remove the connection"""
63					remove(conn) 
64
65			except: 
66				continue
67
68"""Using the below function, we broadcast the message to all 
69clients who's object is not the same as the one sending 
70the message """
71def broadcast(message, connection): 
72	for clients in list_of_clients: 
73		if clients!=connection: 
74			try: 
75				clients.send(message) 
76			except: 
77				clients.close() 
78
79				# if the link is broken, we remove the client 
80				remove(clients) 
81
82"""The following function simply removes the object 
83from the list that was created at the beginning of 
84the program"""
85def remove(connection): 
86	if connection in list_of_clients: 
87		list_of_clients.remove(connection) 
88
89while True: 
90
91	"""Accepts a connection request and stores two parameters, 
92	conn which is a socket object for that user, and addr 
93	which contains the IP address of the client that just 
94	connected"""
95	conn, addr = server.accept() 
96
97	"""Maintains a list of clients for ease of broadcasting 
98	a message to all available people in the chatroom"""
99	list_of_clients.append(conn) 
100
101	# prints the address of the user that just connected 
102	print(addr[0] + " connected")
103
104	# creates and individual thread for every user 
105	# that connects 
106	start_new_thread(clientthread,(conn,addr))	 
107
108conn.close() 
109server.close()
110
111#Client Script
112# Python program to implement client side of chat room. 
113import socket 
114import select 
115import sys 
116
117server = socket.socket(socket.AF_INET, socket.SOCK_STREAM) 
118if len(sys.argv) != 3: 
119	print("Correct usage: script, IP address, port number")
120	exit() 
121IP_address = str(sys.argv[1]) 
122Port = int(sys.argv[2]) 
123server.connect((IP_address, Port)) 
124
125while True: 
126
127	# maintains a list of possible input streams 
128	sockets_list = [sys.stdin, server] 
129
130	""" There are two possible input situations. Either the 
131	user wants to give manual input to send to other people, 
132	or the server is sending a message to be printed on the 
133	screen. Select returns from sockets_list, the stream that 
134	is reader for input. So for example, if the server wants 
135	to send a message, then the if condition will hold true 
136	below.If the user wants to send a message, the else 
137	condition will evaluate as true"""
138	read_sockets,write_socket, error_socket = select.select(sockets_list,[],[]) 
139
140	for socks in read_sockets: 
141		if socks == server: 
142			message = socks.recv(2048) 
143			print(message)
144		else: 
145			message = sys.stdin.readline() 
146			server.send(message) 
147			sys.stdout.write("<You>") 
148			sys.stdout.write(message) 
149			sys.stdout.flush() 
150server.close() 
151
152
153# Server (host) should have the top server script and the clients should have the client script. Both are labelled with a comment