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

[STINNER Victor]

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

> Other than subclasses of thread executor, what are you going to pass in?

I don't see why asyncio should prevent people to experiment their own custom executor. You can imagine a custom "green executor" which inherit from Executor but uses its own black magic like greenlet. People like to do crazy things to implement asynchronous programming :-)

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<https://bugs.python.org/issue34075>
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