#!/usr/bin/python1.5
# File: menu-example-5.py

from Tkinter import *

counter = 0

def update():
    global counter
    counter = counter + 1
    menu.entryconfig(0, label=str(counter))

root = Tk()

menubar = Menu(root)

menu = Menu(menubar, tearoff=0, postcommand=update)
menu.add_command(label=str(counter))
menu.add_command(label="Exit", command=root.quit)

menubar.add_cascade(label="Test", menu=menu)

root.config(menu=menubar)

mainloop()