Path: csiph.com!fu-berlin.de!uni-berlin.de!not-for-mail
From: Ben Finney <ben+python@benfinney.id.au>
Newsgroups: comp.lang.python
Subject: Re: raise None
Date: Thu, 31 Dec 2015 12:44:01 +1100
Lines: 22
Message-ID: <mailman.97.1451526250.11925.python-list@python.org>
References: <56847239$0$1590$c3e8da3$5496439d@news.astraweb.com> <mailman.96.1451522295.11925.python-list@python.org> <5684842a$0$1596$c3e8da3$5496439d@news.astraweb.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 8bit
X-Trace: news.uni-berlin.de r2yDeKgDP6h8DDdWNd4GjwsLnHV5wO8FC37Erh9bPJcA==
Cancel-Lock: sha1:fFnB2NRiIC9k2JXToX/xQc0ZyGk=
Return-Path: <python-python-list@m.gmane.org>
X-Original-To: python-list@python.org
Delivered-To: python-list@mail.python.org
X-Spam-Status: OK 0.001
X-Spam-Evidence: '*H*': 1.00; '*S*': 0.00; 'exception.': 0.07; 'raises': 0.07; 'received:80.91': 0.09; 'received:80.91.229': 0.09; 'received:gmane.org': 0.09; 'received:list': 0.09; 'subject:None': 0.09; 'bug': 0.10; 'exception': 0.13; '*any*': 0.16; '39,': 0.16; 'argument.': 0.16; 'received:80.91.229.3': 0.16; 'received:io': 0.16; 'received:plane.gmane.org': 0.16; 'received:psf.io': 0.16; 'suppressing': 0.16; 'workings': 0.16; 'advocate': 0.22; 'pass': 0.22; 'seems': 0.23; '(most': 0.24; 'header:User-Agent:1': 0.26; 'header:X-Complaints-To:1': 0.26; 'code': 0.30; 'point': 0.33; 'avoiding': 0.33; "d'aprano": 0.33; 'steven': 0.33; 'traceback': 0.33; 'file': 0.34; 'expected': 0.35; 'but': 0.36; 'mode': 0.36; 'to:addr:python-list': 0.36; 'subject:: ': 0.37; 'received:org': 0.37; 'to:addr:python.org': 0.40; 'your': 0.60; 'real': 0.62; '_o__)': 0.84; 'received:125': 0.84; 'virtue': 0.84
X-Injected-Via-Gmane: http://gmane.org/
X-Gmane-NNTP-Posting-Host: jigong.madmonks.org
X-Public-Key-ID: 0xAC128405
X-Public-Key-Fingerprint: 517C F14B B2F3 98B0 CB35  4855 B8B2 4C06 AC12 8405
X-Public-Key-URL: http://www.benfinney.id.au/contact/bfinney-pubkey.asc
X-Post-From: Ben Finney <bignose+hates-spam@benfinney.id.au>
User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.4 (gnu/linux)
X-BeenThere: python-list@python.org
X-Mailman-Version: 2.1.20+
Precedence: list
List-Id: General discussion list for the Python programming language <python-list.python.org>
List-Unsubscribe: <https://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: <https://mail.python.org/mailman/listinfo/python-list>, <mailto:python-list-request@python.org?subject=subscribe>
Xref: csiph.com comp.lang.python:101034

Steven D'Aprano <steve@pearwood.info> writes:

> Traceback (most recent call last):
>   File "spam", line 19, in this
>   File "spam", line 29, in that
>   File "spam", line 39, in other
>   File "spam", line 5, in _validate
> ThingyError: ...
>
> and the reader has to understand the internal workings of _validate
> sufficiently to infer that this exception is not a bug in _validate
> but an expected failure mode of other when you pass a bad argument.

This point seems to advocate for suppressing *any* code that
deliberately raises an exception. Is that your intent?

-- 
 \      “I don't want to live peacefully with difficult realities, and |
  `\     I see no virtue in savoring excuses for avoiding a search for |
_o__)                        real answers.” —Paul Z. Myers, 2009-09-12 |
Ben Finney