A side benefit is that if an Exception somehow propagates up where only
ExceptionGroup is defined, except *() could just work anyway, though it
might take a little magic to make sure they act the same. Like Guido said,
I don't think it can be retrofitted into existing *-less APIs, and it'll
either need a new API and deprecation, or dumping the old for the new
hotness if that's the maintenance strategy, but as long as docs call out
that this is now returning collective exceptions, I don't see a problem.
I don't think it's been mentioned, but it's a nice synergy with pattern
matching, even if it's wholly unrelated, and having both in one release
will actually make sense.
-Em
On Fri, Feb 26, 2021 at 6:45 AM Nathaniel Smith <n...@pobox.com> wrote:
> On Fri, Feb 26, 2021 at 5:05 AM Irit Katriel <iritkatr...@googlemail.com>
> wrote:
> > I'm not sure it's safe to assume that it is necessarily a programming
> error, and that the interpreter can essentially break the program in this
> case.
> > Is this not allowed?
> >
> > try:
> > try:
> > obj.func() # function that raises ExceptionGroups
> > except AttributeError:
> > logger.info("obj doesn't have a func")
> > except *(AttributeError, SyntaxError):
> > logger.info("func had some problems")
>
> I'd be fine with disallowing that. The intuition is that things will
> be simplest if ExceptionGroup is kept as transparent and meaningless
> as possible, i.e. ExceptionGroup(ValueError) and ValueError mean
> exactly the same thing -- "some code inside this block raised
> ValueError" -- and ideally should be processed in exactly the same
> way. (Of course we can't quite achieve that due to backcompat issues,
> but the closer we can get, the better, I think?)
>
> If you need to distinguish between the AttributeError from
> 'obj.__getattr__("func")' vs the AttributeError from the call to
> func(), then there's already an obvious way to do that, that works for
> all functions, not just ones that happen to raise ExceptionGroups:
>
> try:
> f = obj.func
> except AttributeError:
> ...
> try:
> f()
> except ...: # or except *...:
> ...
>
> -n
>
> --
> Nathaniel J. Smith -- https://vorpus.org
>
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