How to terminate a TkinterApp correctly?

[Gregor Lingl]

Michael Peuser schrieb:

> ----- Original Message -----
> From: "Gregor Lingl" <glingl at aon.at>
> Newsgroups: comp.lang.python
> Sent: Saturday, August 16, 2003 3:53 PM
> Subject: Re: How to terminate a TkinterApp correctly?
> 
> ....
> 
> 
>>Thanks for your remarks and your example. The
>>following solution finally did it:
>>
>>def exit():
>>     global done
>>     done = True # so the animation will terminate, but
>>                 # not immediately! The actual pass through
>>                 # the loop has to be finished.
>>     print "done!"
>>     import sys
>>     # after_idle seems to be crucial! Waits for terminating
>>     # the loop (which is in a callback function)
>>     cv.after_idle(sys.exit, (0,))
> 
> 
> 
> Why don't you just return? The mainloop can handle everything!?
> Example:
>      def exit(self):
>         self.done=1
>         return

Here I apparently don't understand something fundamental:
What is the effect of a return statement as the last statement
of a function?

When I put this exit into the cv.master.protocol  call as shown below,
I cannot close the application at all. (I think it's clear to me why)

Regards, Gregor

> (If you can put it into an appropriate class ....)
> 
> 
>>cv.master.protocol("WM_DELETE_WINDOW", exit)
>>
>>if not usingIDLE:
>>     root.mainloop()
>>
>>Regards, Gregor
>>
> 
> 
>