Groups > comp.lang.python > #19668

Re: except clause syntax question

Path	csiph.com!x330-a1.tempe.blueboxinc.net!usenet.pasdenom.info!weretis.net!feeder1.news.weretis.net!feeder.erje.net!newsfeed.xs4all.nl!newsfeed6.news.xs4all.nl!xs4all!post.news.xs4all.nl!not-for-mail
Return-Path	<rosuav@gmail.com>
X-Original-To	python-list@python.org
Delivered-To	python-list@mail.python.org
X-Spam-Status	OK 0.000
X-Spam-Evidence	'H': 1.00; 'S': 0.00; 'cpython': 0.05; 'instance,': 0.05; 'pointer': 0.05; 'warnings': 0.05; 'initialize': 0.07; 'exceptions': 0.09; 'match.': 0.09; 'proximity': 0.09; 'tuple': 0.09; 'api': 0.09; 'am,': 0.12; 'received:209.85.210.174': 0.13; 'received:mail- iy0-f174.google.com': 0.13; '(aka': 0.16; 'from:addr:rosuav': 0.16; 'from:name:chris angelico': 0.16; 'subject:syntax': 0.16; 'subject:question': 0.16; 'wrote:': 0.16; 'wed,': 0.17; "doesn't": 0.22; 'feb': 0.22; 'header:In-Reply-To:1': 0.22; 'url:dev': 0.23; 'code': 0.25; 'saying': 0.25; 'function': 0.27; 'message- id:@mail.gmail.com': 0.28; 'booth': 0.30; 'tuples': 0.30; 'does': 0.32; 'to:addr:python-list': 0.33; "we're": 0.34; 'nested': 0.34; 'null': 0.34; 'url:python': 0.36; 'similar': 0.36; 'received:google.com': 0.37; 'skip:_ 10': 0.37; 'received:209.85': 0.38; 'url:docs': 0.39; 'url:org': 0.39; 'received:209': 0.39; 'subject:: ': 0.39; 'to:addr:python.org': 0.40; 'carry': 0.62; 'absolutely': 0.98
DKIM-Signature	v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=DdR9Uss5YOckwNNxr1OKxm5Ji6jLJqymIvaU61iYS6c=; b=XCe03PpGRb3J91qZE6l1yFG23znpskb1mSGb8okwmMytERtjUZopfXCYe4HomkGtYi 7rw/sllNd5uCZGzWuiQzef7X2rhZMDtfl6qfI7owrbezQq9yfPxqBuqpyxW28NsD51Si +ZIghwM8QDVjp04FPPEtDbHu7YHt3M6csn4DU=
MIME-Version	1.0
In-Reply-To	<Xns9FEBE05D32BCCduncanbooth@127.0.0.1>
References	<mailman.5218.1327946109.27778.python-list@python.org> <Xns9FEBE05D32BCCduncanbooth@127.0.0.1>
Date	Wed, 1 Feb 2012 11:53:48 +1100
Subject	Re: except clause syntax question
From	Chris Angelico <rosuav@gmail.com>
To	python-list@python.org
Content-Type	text/plain; charset=ISO-8859-1
X-BeenThere	python-list@python.org
X-Mailman-Version	2.1.12
Precedence	list
List-Id	General discussion list for the Python programming language <python-list.python.org>
List-Unsubscribe	<http://mail.python.org/mailman/options/python-list>, <mailto:python-list-request@python.org?subject=unsubscribe>
List-Archive	<http://mail.python.org/pipermail/python-list>
List-Post	<mailto:python-list@python.org>
List-Help	<mailto:python-list-request@python.org?subject=help>
List-Subscribe	<http://mail.python.org/mailman/listinfo/python-list>, <mailto:python-list-request@python.org?subject=subscribe>
Newsgroups	comp.lang.python
Message-ID	<mailman.5270.1328057631.27778.python-list@python.org> (permalink)
Lines	16
NNTP-Posting-Host	2001:888:2000:d::a6
X-Trace	1328057631 news.xs4all.nl 6909 [2001:888:2000:d::a6]:59278
X-Complaints-To	abuse@xs4all.nl
Xref	x330-a1.tempe.blueboxinc.net comp.lang.python:19668

Show key headers only | View raw

On Wed, Feb 1, 2012 at 9:03 AM, Duncan Booth
<duncan.booth@invalid.invalid> wrote:
> Abitrarily nested tuples of exceptions cannot contain loops so the code
> simply needs to walk through the tuples until it finds a match.

Is this absolutely guaranteed? The C API for CPython provides:
(Py2) http://docs.python.org/c-api/tuple.html#PyTuple_SetItem
(Py3) http://docs.python.org/dev/c-api/tuple.html#PyTuple_SetItem

which doesn't have massive warnings on it saying "USE THIS ONLY TO
INITIALIZE A TUPLE" (compare, for instance, _PyTuple_Resize which does
carry a similar warning). Is the assumption then that we're all
adults, and that mutating a tuple is like passing a null pointer to an
API function (aka "loaded gun in proximity to foot")?

ChrisA

Thread

except clause syntax question Charles Yeomans <charles@declareSub.com> - 2012-01-30 12:41 -0500
  Re: except clause syntax question Mel Wilson <mwilson@the-wire.com> - 2012-01-30 14:15 -0500
  Re: except clause syntax question Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-01-31 00:00 +0000
    Re: except clause syntax question Devin Jeanpierre <jeanpierreda@gmail.com> - 2012-01-30 19:25 -0500
    Re: except clause syntax question Charles Yeomans <charles@declareSub.com> - 2012-01-31 08:57 -0500
      Re: except clause syntax question Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-01-31 14:51 +0000
        Re: except clause syntax question Charles Yeomans <charles@declareSub.com> - 2012-01-31 11:23 -0500
        Re: except clause syntax question Devin Jeanpierre <jeanpierreda@gmail.com> - 2012-01-31 11:38 -0500
        Re: except clause syntax question Charles Yeomans <charles@declaresub.com> - 2012-01-31 12:29 -0500
        Re: except clause syntax question Ethan Furman <ethan@stoneleaf.us> - 2012-01-31 08:56 -0800
    Re: except clause syntax question Terry Reedy <tjreedy@udel.edu> - 2012-01-31 19:12 -0500
    Re: except clause syntax question Charles Yeomans <charles@declareSub.com> - 2012-01-31 19:27 -0500
  Re: except clause syntax question Mel Wilson <mwilson@the-wire.com> - 2012-01-31 08:24 -0500
    Re: except clause syntax question Charles Yeomans <charles@declareSub.com> - 2012-01-31 13:04 -0500
  Re: except clause syntax question Duncan Booth <duncan.booth@invalid.invalid> - 2012-01-31 22:03 +0000
    Re: except clause syntax question Chris Angelico <rosuav@gmail.com> - 2012-02-01 11:53 +1100
      Re: except clause syntax question Mel Wilson <mwilson@the-wire.com> - 2012-01-31 23:39 -0500
    Re: except clause syntax question Ian Kelly <ian.g.kelly@gmail.com> - 2012-01-31 18:09 -0700
    Re: except clause syntax question Ian Kelly <ian.g.kelly@gmail.com> - 2012-01-31 18:12 -0700
    Re: except clause syntax question Chris Angelico <rosuav@gmail.com> - 2012-02-01 13:46 +1100

csiph-web