from Tkinter import *

# This is a program that makes a simple two button application

class New_Button(Button):

    def callback(self):

        print self.counter

        self.counter = self.counter + 1

def createWidgets(top):

    f = Frame(top)

    f.pack()

    f.QUIT = Button(f, text='QUIT', foreground='red', command=top.quit)

    f.QUIT.pack(side=LEFT, fill=BOTH)

    # a hello button

    f.hi_there = New_Button(f, text='Hello')

    # we do this on a different line because we need to reference f.hi_there

    f.hi_there.config(command=f.hi_there.callback)

    f.hi_there.pack(side=LEFT)

    f.hi_there.counter = 43

root = Tk()

createWidgets(root)

root.mainloop()