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Groups > comp.lang.python > #88840

Re: try..except with empty exceptions

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On Sun, Apr 12, 2015 at 6:04 AM, Chris Angelico <rosuav@gmail.com> wrote:
> On Sun, Apr 12, 2015 at 4:49 AM, Ian Kelly <ian.g.kelly@gmail.com> wrote:
>> On Apr 11, 2015 5:06 AM, "Steven D'Aprano"
>> <steve+comp.lang.python@pearwood.info> wrote:
>>>
>>> Yes, I agree that Python's behaviour here is better than the alternative.
>>> Having "except ()" catch nothing is consistent with the behaviour with
>>> other tuples, so I'm okay with that. But it still surprised me :-)
>>
>> There's another alternative that I haven't seen suggested yet. An empty
>> tuple could be considered an indication of a programming error and raise a
>> chained ValueError.
>
> Not really a lot of point. Just as with isinstance, an empty tuple
> simply matches nothing. Why go to the effort of rejecting it?

(At least, I assume you're not putting a literal empty tuple in. This
would be useful only in cases where the tuple is provided
dynamically.)

ChrisA

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Thread

try..except with empty exceptions Pavel S <pavel@schon.cz> - 2015-04-10 01:48 -0700
  Re: try..except with empty exceptions Chris Angelico <rosuav@gmail.com> - 2015-04-10 18:58 +1000
  Re: try..except with empty exceptions sohcahtoa82@gmail.com - 2015-04-10 12:31 -0700
    Re: try..except with empty exceptions Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-04-11 11:42 +1000
      Re: try..except with empty exceptions Dave Angel <davea@davea.name> - 2015-04-10 22:23 -0400
        Re: try..except with empty exceptions Rustom Mody <rustompmody@gmail.com> - 2015-04-10 19:38 -0700
          Re: try..except with empty exceptions Dave Angel <davea@davea.name> - 2015-04-10 23:46 -0400
            Re: try..except with empty exceptions Rustom Mody <rustompmody@gmail.com> - 2015-04-10 21:17 -0700
              Re: try..except with empty exceptions Rustom Mody <rustompmody@gmail.com> - 2015-04-10 21:39 -0700
          Re: try..except with empty exceptions Cameron Simpson <cs@zip.com.au> - 2015-04-11 19:27 +1000
            Re: try..except with empty exceptions Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-04-11 21:00 +1000
              Re: try..except with empty exceptions Chris Angelico <rosuav@gmail.com> - 2015-04-11 21:21 +1000
              Re: try..except with empty exceptions Ian Kelly <ian.g.kelly@gmail.com> - 2015-04-11 12:49 -0600
              Re: try..except with empty exceptions Chris Angelico <rosuav@gmail.com> - 2015-04-12 06:04 +1000
              Re: try..except with empty exceptions Chris Angelico <rosuav@gmail.com> - 2015-04-12 06:05 +1000
        Re: try..except with empty exceptions Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-04-11 17:11 +1000
          Re: try..except with empty exceptions Serhiy Storchaka <storchaka@gmail.com> - 2015-04-11 11:22 +0300
            Re: try..except with empty exceptions Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-04-11 20:47 +1000
          Re: try..except with empty exceptions Dave Angel <davea@davea.name> - 2015-04-11 06:14 -0400
          Re: try..except with empty exceptions Dave Angel <davea@davea.name> - 2015-04-11 06:24 -0400
          Re: try..except with empty exceptions Ian Foote <ian@feete.org> - 2015-04-11 15:20 +0100
      Re: try..except with empty exceptions Terry Reedy <tjreedy@udel.edu> - 2015-04-11 04:58 -0400
  Re: try..except with empty exceptions Dave Angel <davea@davea.name> - 2015-04-10 16:27 -0400
  Re: try..except with empty exceptions Rustom Mody <rustompmody@gmail.com> - 2015-04-10 18:56 -0700

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