Hi,
On Sun, 15 Dec 2019 18:29:18 +0000
Mike Barnett <mike_barn...@hotmail.com> wrote:
> I've been fighting this error for a couple of years now and just when I
> think I've got it understood and "Fixed", it bites me again.
>
>
>
> Here's the error:
>
>
>
> Exception ignored in: <function Variable.__del__ at 0x0000016CA840C9D0>
>
> Traceback (most recent call last):
>
> File "X:\Python\python3.8\lib\tkinter\__init__.py", line 351, in
> __del__
>
> if self._tk.getboolean(self._tk.call("info", "exists", self._name)):
>
> RuntimeError: main thread is not in main loop
(...)
> It happens in programs that are multi-threaded. The threads do NOT
> make any tkinter calls and do not touch any variable that has anything
> to do with tkinter.
>
> What appears to be happening is that tkinter objects are marked to be
> deleted and then when Python's garbage collect runs and actually does
> the deletes, it is happening in the context of the thread, not the main
> thread.
>
> My way around this at the moment is to keep the widgets around for the
> duration of the program rather than deleting them in any way. I would
> really like to get this solved though as other people using my code run
> into this and don't know what to do.
>
> Any ideas on how to dispose of widgets / windows in a way that
> immediately calls these delete methods? Or is it possible to tell
> tkinter that despite the deletes being called from another thread it's
> OK because the thread isn't actually changing anything at the same time
> as the main thread?
>
I am not sure what is happening here. It sounds a bit as if the tk gui is
not in the main program thread? If yes, maybe this causes the problem; as
far as I know it is imperative that the tk mainloop is inside
the main program thread.
Regards
Michael
.-.. .. ...- . .-.. --- -. --. .- -. -.. .--. .-. --- ... .--. . .-.
We're all sorry for the other guy when he loses his job to a machine.
But when it comes to your job -- that's different. And it always will
be different.
-- McCoy, "The Ultimate Computer", stardate 4729.4
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