Terry J. Reedy <tjre...@udel.edu> added the comment:
When I closed the main thread by clicking [x], thus destroying root, both event
threads raised instead of hanging. So my experiment involved calling
root.destroy instead of setting running to False. The better result when
running under IDLE might be due to IDLE's run process executes
tcl.call('update') about 20 times per second. Even if the exception idea could
be made to work, it seems like a kludge.
Waiting on the event threads from a separate non-gui thread and leaving the
main thread fully functional and responsive until the gui threads die seems
much cleaner. Perhaps this should be recommended as a standard way to shut
down the main thread when there might be active gui threads. Thank you for
following through with this to get a solution we both like.
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<https://bugs.python.org/issue33412>
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