client.py

# -*- coding: utf-8 -*- 
import socket
from Tkinter import *
import os
reload(sys)
sys.setdefaultencoding('utf-8')

tk=Tk()

s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
s.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
s.bind(('0.0.0.0',11719))#11719

sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sock.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST,1)

text=StringVar()
name=StringVar()
name.set('Client')
text.set('')
tk.title('Chat')
tk.geometry('400x300')

log = Text(tk)
nick = Entry(tk, textvariable=name)
msg = Entry(tk, textvariable=text)
msg.pack(side='bottom', fill='x', expand='true')
nick.pack(side='bottom', fill='x', expand='true')
log.pack(side='top', fill='both',expand='true')
def loopproc():
    log.see(END)
    s.setblocking(False)
    try:
        message = s.recv(128)
        log.insert(END,message+'\n')
    except:
        tk.after(1,loopproc)
        return
    tk.after(1,loopproc)
    return

def sendproc(event):
    if(text.get()==':exit'):
		text.set('  logged  out====')
		sock.sendto ('====User  '+name.get()+text.get(),('255.255.255.255',11719))
		exit(0)
    sock.sendto (name.get()+':'+text.get(),('255.255.255.255',11719))
    text.set('')

msg.bind('<Return>',sendproc)

msg.focus_set()

tk.after(1,loopproc)
tk.mainloop()