Sender

import Tkinter as tk
import sys
import os
import socket
import random
import tkMessageBox

root= tk.Tk()
root.title("UDP Messenger")
w = 300
h = 200
x = 50
y = 100

root.geometry("%dx%d+%d+%d" % (w, h, x, y))
frame = tk.Frame(root, bg='white')
frame.pack(fill='both', expand='yes')

ip1 = tk.Label(frame, font="Arial", text="IP: ")
ip1.place(x=10, y=10)

ip2 = tk.Entry(frame, bd=5)
ip2.place(x=60, y=10)

msg1 = tk.Label(frame, font="Arial",text="Message: ")
msg1.place(x=10, y=50)

msg2 = tk.Entry(frame, bd=5, width=30)
msg2.place(x=90, y=50)

def mail():
    hostname = (ip2.get())
    if hostname == "":
        tkMessageBox.showinfo("Error", "IP Address is not defined")
    msg3 = (msg2.get())
    host = str(hostname)
    msg = str(msg3)
    s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    s.sendto(msg, (host, 5005))

def quit():
    sys.exit()

button = tk.Button(frame, text="Send", bg="yellow", font="Arial",width=10,command=mail)
button.place(x=10, y=100)

button1 = tk.Button(frame, text="Quit", bg="red", font="Arial", fg="white", width=10,command=quit)
button1.place(x=170, y=100)

root.mainloop()