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

[Andrew Svetlov]

Andrew Svetlov <andrew.svetlov at gmail.com> added the comment:

Agree, restricting to ThreadPoolExecutor sounds reasonable.

A custom executor may have the same problem as ProcessPoolExecutor.

Moreover it can work under same scenarios but crash with other third-party libs.

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