1 # Display hello, world in a button; clicking it quits the program

     2 

     3 import sys

     4 from Tkinter import *

     5 

     6 def main():

     7     root = Tk()

     8     button = Button(root)

     9     button['text'] = 'Hello, world'

    10     button['command'] = quit_callback       # See below

    11     button.pack()

    12     root.mainloop()

    13 

    14 def quit_callback():

    15     sys.exit(0)

    16 

    17 main()