[Tkinter-discuss] Stumped

[Bob Greschke]

Adding the ----- lines seems to work.

> from Tkinter import *
> import time
> 
> def on_button():
>     for J in range(10):
>         print J
>         if CancelNow:
>             break
>         time.sleep(1)
------ Root.update()
> 
> def Cancel(Event):
------ global CancelNow
>     print 'Cancelling now'
>     CancelNow = True
>     Root.quit()
> 
> Root = Tk()
> Root.bind_all('<Key-Escape>',Cancel)
> 
> B = Button(Root,command=on_button,text='Go')
> B.pack()
> CancelNow = False
> 
> Root.mainloop()