E. Paine <xepain...@gmail.com> added the comment:

> Simply uncommenting that works perfectly on Ubuntu 20.04 and Windows 10.

I can't remember the details, but I don't think this worked if the Tcl 
interpreter had been garbage collected before the Python interpreter shutdown. 
Therefore, Tcl_Finalize (or similar) would preferably be called at Tkapp 
dealloc, but we cannot do that because the user may create more interpreters 
later. I will try and give a reproducible example when I have time.

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<https://bugs.python.org/issue40452>
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