from Tkinter import *

master = Tk()

def OKButtonHandler():
    # This is still a callback function--just has a new name
    # Be sure that the handler name matches the name in the
    # command field of the appropriate button
    print "click!"

def HowdyButtonHandler():
    # This is still a callback function--just has a new name
    # Be sure that the handler name matches the name in the
    # command field of the appropriate button
    print "Howdy from HowdyButtonHandler()!"



b = Button(master, text="OK", command=OKButtonHandler)
b.pack()

anotherButton = Button(master, text="Howdy", command=HowdyButtonHandler)
anotherButton.pack()

mainloop()