[issue30097] Command-line option to suppress "from None" for debugging

[Ethan Furman]

Ethan Furman <ethan at stoneleaf.us> added the comment:

The actual problem, I think, is that `from None` is suppressing more than it ought.  Martin's example would work just fine if the only omitted exception was the one captured during its own try/except.

Created issue39725.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue30097>
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