Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!feeds.phibee-telecom.net!newsfeed.xs4all.nl!newsfeed1a.news.xs4all.nl!xs4all!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail Return-Path: X-Original-To: python-list@python.org Delivered-To: python-list@mail.python.org X-Spam-Status: OK 0.026 X-Spam-Evidence: '*H*': 0.95; '*S*': 0.00; 'yet.': 0.04; 'indication': 0.09; 'okay': 0.09; 'chained': 0.16; 'tuple': 0.16; 'tuples,': 0.16; ':-)': 0.16; 'wrote:': 0.18; "python's": 0.19; 'programming': 0.22; 'error': 0.23; "haven't": 0.24; '>': 0.26; 'suggested': 0.26; 'header:In-Reply-To:1': 0.27; 'am,': 0.29; 'raise': 0.29; 'message-id:@mail.gmail.com': 0.30; "i'm": 0.30; 'that.': 0.31; 'another': 0.32; 'could': 0.34; 'subject:with': 0.35; 'agree': 0.35; 'but': 0.35; 'received:google.com': 0.35; 'consistent': 0.36; 'to:addr:python-list': 0.38; 'to:addr:python.org': 0.39; 'catch': 0.60; 'here': 0.66; '2015': 0.84; 'alternative.': 0.84; 'subject:..': 0.84 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=v9UwPMtJ+VcwGApIdcjaBU5FblxgrH6beyYv1jLpGUM=; b=nqNYDaEb/dqfzis0t4XssaCFrASu9u1LpWmfnUF+PQ8V7tdnw5SfktneKaZpDXLWW1 79FOgd8CuPV8uFbZEl/C0ExHs9UpqRxGBU9Bw6To7hDAEekoEkH8RhJvLKygO2Gauswd sylhNOl+DJdJiS51PXlbPzVNic/wW2/Chwb0RePz2jVxhryltZxu+YikOx/eZ6tCKOE7 lHrZABxTjELd52F9SflibU5Ri/946Tf5e7o+JssDrsQNQO7Kz5qZeZsFCJJQCbCevuk7 wf1HxVgqNBcYEa4oa8BHipdGJgJJJmCw8UJ3SGAr91ZptRtLjaHqBMXaMHscu8Pw5/1A G8xQ== MIME-Version: 1.0 X-Received: by 10.50.25.225 with SMTP id f1mr6172113igg.29.1428778148515; Sat, 11 Apr 2015 11:49:08 -0700 (PDT) In-Reply-To: <5528feec$0$13002$c3e8da3$5496439d@news.astraweb.com> References:

<5528feec$0$13002$c3e8da3$5496439d@news.astraweb.com> Date: Sat, 11 Apr 2015 12:49:08 -0600 Subject: Re: try..except with empty exceptions From: Ian Kelly To: Python Content-Type: multipart/alternative; boundary=047d7bd76f7c01564c051377568b X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: General discussion list for the Python programming language List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Newsgroups: comp.lang.python Message-ID: Lines: 25 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1428778155 news.xs4all.nl 2905 [2001:888:2000:d::a6]:42563 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:88837 --047d7bd76f7c01564c051377568b Content-Type: text/plain; charset=UTF-8 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. --047d7bd76f7c01564c051377568b Content-Type: text/html; charset=UTF-8

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.

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