#!/usr/bin/env python

import Tkinter
top = Tkinter.Tk()

hello = Tkinter.Label(top, text='Hello World!')
hello.pack()

quit = Tkinter.Button(top, text='QUIT', \
    command=top.quit, bg='red', fg='white')
quit.pack(fill=Tkinter.X, expand=1)

Tkinter.mainloop()