[Python-ideas] Block-Scoped Exception Handlers

[Kyle Lahnakoski]

On 5/5/2016 11:23 AM, Michael Selik wrote:
>
>
> On Thu, May 5, 2016, 7:13 AM Kyle Lahnakoski <klahnakoski at mozilla.com
> <mailto:klahnakoski at mozilla.com>> wrote:
>
>
>
>     On 5/4/2016 10:31 PM, Steven D'Aprano wrote:
>     > On Thu, May 05, 2016 at 02:17:25AM +0000, Michael Selik wrote:
>     >
>     >> Unfortunately, Kyle is using Python 2.7 still, so ``raise
>     from`` won't help
>     >> him.
>     > If Kyle is using Python 2.7, then a new feature which is only
>     introduced
>     > to 3.6 or 3.7 isn't going to help him either.
>     >
>
>     It will help me!  Eventually.  :)
>
>
> I thought you said the ``raise from`` syntax solved the problem. No?

I am jealous that Python 3.x has `raise from`, and I can not use it.  
`raise from` does solve the exception chaining problems in 2.7, but that
can be worked around just as effectively [1].  Me being stuck in 2.7
will not last forever.

`raise from` does not solve the excessive indentation problem:  I have
many `try` clauses, causing deep indentation in my code.  The
block-scoped exception handlers would mitigate this deep indentation,
and make exception handling even easier to add.
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