1# Display hello, world in a button; clicking it quits the program
2
3import sys
4from Tkinter import *
5
6def 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
14def quit_callback():
15    sys.exit(0)
16
17main()
18