[issue45037] theme-change.py for tkinter lib

[E. Paine]

New submission from E. Paine <xepaine13 at gmail.com>:

I'm slightly confused about the purpose of this PR. Is the intention to create a demo, or this designed to be used as an API?

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nosy: +epaine, serhiy.storchaka, terry.reedy

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<https://bugs.python.org/issue45037>
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