#!/usr/bin/python
from Tkinter import *

def greet():
   print "hello world"

win = Frame()

Button(win, text = 'Button4').pack(side=TOP)
Button(win, text = 'Button5').pack(side=TOP)
Button(win, text = 'hello', command=greet).pack(side=LEFT)
Button(win,text='quit',command=win.quit).pack(side=RIGHT)
win.pack()
win.mainloop()