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To: python-list@python.org
From: Terry Reedy <tjreedy@udel.edu>
Subject: Re: Tkinter widgets into classes.
Date: Sat, 01 Feb 2014 20:26:09 -0500
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Xref: csiph.com comp.lang.python:65247

Idle, which used tkinter, runs multiple windows in one process with one 
event loop. There is no reason I know of to run multiple event loops in 
one process, and if you do, the results will not be documented and might 
vary between runs or between different systems.

Idle can also be run multiple times in multiple processes, each with its 
own event loop. But there is seldom a reason to do that with the same 
version. On the other hand, I routinely have more than one version 
running in order to test code with multiple versions. I can even have 
the same file open in multiple versions.

-- 
Terry Jan Reedy