[New-bugs-announce] [issue30792] Add contextlib.convert_exception manager

[Steven D'Aprano]

New submission from Steven D'Aprano:

As discussed on Python-Ideas, there's some interest in a context manager that can convert an exception from one type to another (similarly to the way PEP 479 has StopIteration converted to RuntimeError.

See the thread starting here:
https://mail.python.org/pipermail/python-ideas/2017-June/046109.html

and particularly Nick's comment here:
https://mail.python.org/pipermail/python-ideas/2017-June/046218.html

I've written a recipe on ActiveState:

https://code.activestate.com/recipes/580808-guard-against-an-exception-in-the-wrong-place/

which acts as both a context manager and function decorator. That can be used as proof-of-concept or as a basis for a PR.

----------
components: Library (Lib)
messages: 297193
nosy: ncoghlan, steven.daprano
priority: normal
severity: normal
status: open
title: Add contextlib.convert_exception manager
type: enhancement
versions: Python 3.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30792>
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