ejemplo de código python del servidor de chat simple de socket

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Ejemplo: cómo hacer un cuadro de chat usando Python

#Server Scriptimport socket 
import select 
import sys 
from thread import*"""The first argument AF_INET is the address domain of the 
socket. This is used when we have an Internet Domain with 
any two hosts The second argument is the type of socket. 
SOCK_STREAM means that data or characters are read in 
a continuous flow."""
server = socket.socket(socket.AF_INET, socket.SOCK_STREAM) 
server.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR,1)# checks whether sufficient arguments have been provided iflen(sys.argv)!=3:print("Correct usage: script, IP address, port number")
	exit()# takes the first argument from command prompt as IP address 
IP_address =str(sys.argv[1])# takes second argument from command prompt as port number 
Port =int(sys.argv[2])""" 
binds the server to an entered IP address and at the 
specified port number. 
The client must be aware of these parameters 
"""
server.bind((IP_address, Port))""" 
listens for 100 active connections. This number can be 
increased as per convenience. 
"""
server.listen(100) 

list_of_clients =[]defclientthread(conn, addr):# sends a message to the client whose user object is conn 
	conn.send("Welcome to this chatroom!")whileTrue:try: 
				message = conn.recv(2048)if message:"""prints the message and address of the 
					user who just sent the message on the server 
					terminal"""print("<"+ addr[0]+"> "+ message )# Calls broadcast function to send message to all 
					message_to_send ="<"+ addr[0]+"> "+ message 
					broadcast(message_to_send, conn)else:"""message may have no content if the connection 
					is broken, in this case we remove the connection"""
					remove(conn)except:continue"""Using the below function, we broadcast the message to all 
clients who's object is not the same as the one sending 
the message """defbroadcast(message, connection):for clients in list_of_clients:if clients!=connection:try: 
				clients.send(message)except: 
				clients.close()# if the link is broken, we remove the client 
				remove(clients)"""The following function simply removes the object 
from the list that was created at the beginning of 
the program"""defremove(connection):if connection in list_of_clients: 
		list_of_clients.remove(connection)whileTrue:"""Accepts a connection request and stores two parameters, 
	conn which is a socket object for that user, and addr 
	which contains the IP address of the client that just 
	connected"""
	conn, addr = server.accept()"""Maintains a list of clients for ease of broadcasting 
	a message to all available people in the chatroom"""
	list_of_clients.append(conn)# prints the address of the user that just connected print(addr[0]+" connected")# creates and individual thread for every user # that connects 
	start_new_thread(clientthread,(conn,addr))	 

conn.close() 
server.close()#Client Script# Python program to implement client side of chat room. import socket 
import select 
import sys 

server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)iflen(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))whileTrue:# 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(2048)print(message)else: 
			message = sys.stdin.readline() 
			server.send(message) 
			sys.stdout.write("<You>") 
			sys.stdout.write(message) 
			sys.stdout.flush() 
server.close()# Server (host) should have the top server script and the clients should have the client script. Both are labelled with a comment

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