[issue34075] asyncio: We should prohibit setting a ProcessPoolExecutor in with set_default_executor

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

> I think we'll only allow instances of c.f.ThreadPoolExecutor (and its subclasses) to be passed to set_default_executor.  That's a more robust check than just guarding against ProcessPoolExecutor.

I suggest to only reject ProcessPoolExecutor, instead of having a very specific test on ThreadPoolExecutor which might fail with funky but valid thread executor.

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nosy: +vstinner

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34075>
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