[issue37088] Add a way to schedule a function to be called from the main thread

[Eric Snow]

Eric Snow <ericsnowcurrently at gmail.com> added the comment:

If this is about signals, it isn't enough just to run on the main thread.  It also has to be the main interpreter.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37088>
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