Peer to Peer Chatting using TCP Socket

Program :

Server Side:

#!/usr/bin/env python 

""" 
A simple echo server 
""" 

import socket 
from threading import Thread, Lock
import sys

def receiver(sock):
	global flag
	while flag:
		'''Receive data from client''' #Receive client data
		if data == 'quit':
			sys.exit(0)
		print("\t\t"+data	)
	flag = True
	print ("Thread Exiting")

host = ''		#Server IP addres
port = 50000	#Port address 
backlog = 5 	#For binding connections
size = 1024 	#Size of packet data to receive
flag = True

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) #Creating a Socket
s.bind((host,port)) 	#Binding Port and IP address
s.listen(backlog) 		#Listen to connection

while 1: 
	print("Waiting for Peer to Join...")
	address = 	#Accept a client connecion
	print ("Client "+str(address)+"joined chat.\n")
	
	# Start channel receiver thread
	'''Create a thread'''
	recv_thread.daemon = True
	recv_thread.start()	
	
	data = "random"	#Entering any value so it is not quit initially 	
	while data != 'quit':	#User will enter 'quit' to exit server
		data = input()	#Enter message to send to client
		'''Send data to client''' 	#Sending data to client
	flag = False
	client.close()	#Closing the socket

Client Side :

#!/usr/bin/env python 

""" 
A simple peer to peer chat
lines: 14
""" 

import socket 
from threading import Thread, Lock
import sys

def receiver(sock):
	while flag:
		'''Receive data from server''' #Receive data from server
		if data == 'quit':
			sys.exit(0)
		print ("\t\t"+data)

host = 'localhost' 		#Server IP addres
port = 50000			#Port address 
size = 1024 			#Size of packet data to receive
flag = True

sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) 	#Creating a Socket
sock.connect((host,port)) 	#Connect to Server

# Start Receiver Thread
hop = Thread(target=receiver, args=(sock,))
hop.daemon = True
hop.start()	

data = "random"	#Entering any value so it is not quit initially 	

while data != 'quit':	#User will enter 'quit' to exit server
	data = input()	#Enter message to send to server
	'''Send data to server''' 	#Sending data to server
sock.close() 	#Closing the socket