[issue42848] asyncio produces an unexpected traceback with recursive __getattribute__

[Irit Katriel]

Irit Katriel <iritkatriel at yahoo.com> added the comment:

I've simplified the format() code in the PR, based on the observation that only one chained exception is ever emitted. I think it's reasonably simple now.

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<https://bugs.python.org/issue42848>
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