Re: exception problem

Path	csiph.com!newsfeed.hal-mli.net!feeder3.hal-mli.net!204.52.135.9.MISMATCH!newsfeed.hal-mli.net!feeder1.hal-mli.net!newsfeed.xs4all.nl!newsfeed6.news.xs4all.nl!xs4all!post.news.xs4all.nl!not-for-mail
Return-Path	<d@davea.name>
X-Original-To	python-list@python.org
Delivered-To	python-list@mail.python.org
X-Spam-Status	OK 0.011
X-Spam-Evidence	'H': 0.98; 'S': 0.00; 'mrab': 0.05; 'debug': 0.07; 'exception.': 0.09; 'python': 0.10; 'cc:addr:python-list': 0.10; '(it': 0.16; 'exist.': 0.16; 'opposite': 0.16; 'silly': 0.16; 'subject:exception': 0.16; 'thread,': 0.16; 'wrote:': 0.17; '>>>': 0.22; 'subject:problem': 0.22; 'header:In-Reply-To:1': 0.23; 'header:User-Agent:1': 0.26; 'cc:20': 0.27; 'cc:no real name:20': 0.28; "doesn't": 0.28; 'cc:addr:python.org': 0.29; 'displayed': 0.29; 'skip:_ 10': 0.31; 'could': 0.33; 'problem': 0.35; 'except': 0.35; 'but': 0.36; 'point.': 0.37; 'subject:: ': 0.37; 'pm,': 0.38; 'wanted': 0.38; 'anything': 0.39; 'information': 0.62; 'real': 0.63; 'header:Reply-To:1': 0.67; 'reply-to:no real name:2**0': 0.71; 'received:74.208': 0.72; 'bare': 0.84
Date	Sun, 24 Jun 2012 21:02:29 -0400
From	Dave Angel <d@davea.name>
User-Agent	Mozilla/5.0 (X11; Linux x86_64; rv:13.0) Gecko/20120615 Thunderbird/13.0.1
MIME-Version	1.0
To	Charles Hixson <charleshixsn@earthlink.net>
Subject	Re: exception problem
References	<4FE79433.8020704@earthlink.net> <4FE7982C.5020708@mrabarnett.plus.com> <4FE79FC9.5050404@earthlink.net>
In-Reply-To	<4FE79FC9.5050404@earthlink.net>
Content-Type	text/plain; charset=ISO-8859-1
Content-Transfer-Encoding	7bit
X-Provags-ID	V02:K0:agcF5RPG9gIUYJCjMZvmluLagukheU+1gmKoy6cQQ42 BX0Hzjo1mubOsiyv0HpKIVmX1us9myXUVlDBQAEgnxK8PLoAKY GUBUbB7fsFQoLgwAGALTDtkSWOUkvYZkk9vHED0ZWkldzzLGNc TL/HzGQBiJVyCwgkhCJMOqRnrwdjoCpHu956iYLunx/4SrDV6x 1FX8itLSVAZu9LNejuXLtzZZFr7l7C0UCTq5fmBa32j5t0ie9m SqiL1aJFWnildnW+vJ2XMqIkp+yS1MXLYTa2O7Qlee9sdwFEaB sZVZtw3AJdfl7hWoPf/zG2qIpTVkKB7ITPLqP05gqtZIyu9bQ= =
Cc	python-list@python.org
X-BeenThere	python-list@python.org
X-Mailman-Version	2.1.12
Precedence	list
Reply-To	d@davea.name
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.1468.1340586188.4697.python-list@python.org> (permalink)
Lines	26
NNTP-Posting-Host	2001:888:2000:d::a6
X-Trace	1340586188 news.xs4all.nl 6880 [2001:888:2000:d::a6]:39270
X-Complaints-To	abuse@xs4all.nl
Xref	csiph.com comp.lang.python:24408

Show key headers only | View raw

On 06/24/2012 07:16 PM, Charles Hixson wrote:
> On 06/24/2012 03:43 PM, MRAB wrote:
>> On 24/06/2012 23:26, Charles Hixson wrote:
>>> <SNIP>
>>>
>>>
>> Don't use a bare "except"; it'll catch _any__exception. Catch only what
>> you expect.
>>
>> For all I know, it could be that the name "l" doesn't exist.
> But what I wanted was to catch any exception.  A problem was happening
> and I had no clue as to what it was.  (It turned out to be "self is
> not defined".  A silly mistake, but a real one.)
>

If you don't get anything else out of this thread, get this point.  A
bare except is exactly the opposite of what you want to debug an
exception.  It swallows all the information that python would have
displayed for you.

Four or five of us have made the same point, so please listen.

-- 

DaveA

Back to comp.lang.python | Previous | Next | Find similar | Unroll thread

Thread

Re: exception problem Dave Angel <d@davea.name> - 2012-06-24 21:02 -0400

csiph-web