[issue32309] Implement asyncio.run_in_executor shortcut

[Kyle Stanley]

Kyle Stanley <aeros167 at gmail.com> added the comment:

> since the new threads are spawned in ThreadPoolExecutor *after* executor.submit() is called

It's also worth mentioning that ThreadPoolExecutor only spawns up to one additional thread at a time for each executor.submit() called.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32309>
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