newbie:this program stops responding after pressing quit button

[Boris]

I am using windows vista and python 2.5 .This program stops responding
after pressing quit button. I am not able to figure the problem out.
please help.

from Tkinter import *

def greeting( ):
    print 'Hello stdout world!...'

win = Frame(
 )
win.pack( )
Label(win,  text='Hello container world').pack(side=TOP)
Button(win, text='Hello', command=greeting).pack(side=LEFT)
Button(win, text='Quit',  command=win.quit).pack(side=RIGHT)

win.mainloop( )