gistfile1.py

import Tkinter
import math
import thread
    
def update():
    data = 1
    while 1:
        y = data + 1
        data = y
        text.set(`data`)

app = Tkinter.Tk()
text = Tkinter.StringVar()
Tkinter.Label(app, textvariable = text).pack()
Tkinter.Button(app, text="start", command = thread.start_new(update, ()) ).pack()
app.mainloop()