On Wed, Sep 29, 2021 at 10:01:52PM -0300, Soni L. wrote:
> So uh, this is a hardly at all fleshed out idea, but one thing we really
> don't like about python is having to do stuff like this so as to not
> swallow exceptions:
Is that the Royal We or are you actually speaking on behalf of other
people?
> def a_potentially_recursive_function(some, args):
> """
> Does stuff and things.
> Raises ExceptionWeCareAbout under so and so conditions.
> """
> try:
> some.user_code()
> except ExceptionWeCareAbout as exc:
> raise RuntimeError from exc
> code_we_assume_is_safe()
> if args.something and some_condition:
> raise ExceptionWeCareAbout
I don't see an obvious recursive call there, although I suppose it could
be buried in some.user_code().
It isn't clear to me why it matters that this could be recursive, or why
you raise RuntimeError.
By the way, you may not need the "raise...from exc" syntax. The
difference between:
except NameError:
raise RuntimeError
and
except NameError as exc:
raise RuntimeError from exc
is *extremely* minimal. In a practical sense, the main difference is
that the first traceback will say:
NameError traceback
During handling of the above exception, another exception occurred
RuntimeError traceback
and the second will say:
NameError traceback
The above exception was the direct cause of the following exception
RuntimeError traceback
So it might not matter that much to you.
Anyway, that's just a minor aside.
> It'd be nice if there was a way to... make this easier to deal with.
It isn't clear to me what part of the above isn't already easy to deal
with. Maybe you need a more realistic, runnable, example that
demonstrates why this is an actual problem?
And maybe the actual problem is not exception handling, but a
sub-optimal design for your algorithm.
(More comments to follow.)
--
Steve
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