Path: csiph.com!x330-a1.tempe.blueboxinc.net!usenet.pasdenom.info!news.albasani.net!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail
From: Gregory Ewing <greg.ewing@canterbury.ac.nz>
Newsgroups: comp.lang.python
Subject: Re: None versus MISSING sentinel -- request for design feedback
Date: Sat, 16 Jul 2011 14:24:21 +1200
Lines: 13
Message-ID: <98cb2oF3vpU1@mid.individual.net>
References: <4e1fd009$0$29986$c3e8da3$5496439d@news.astraweb.com>	<mailman.1044.1310710125.1164.python-list@python.org>	<4e201a9d$0$29989$c3e8da3$5496439d@news.astraweb.com>	<mailman.1060.1310727853.1164.python-list@python.org>	<4e203706$0$29972$c3e8da3$5496439d@news.astraweb.com>	<ivpeip$l9$1@speranza.aioe.org> <mailman.1071.1310749444.1164.python-list@python.org>
Mime-Version: 1.0
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit
X-Trace: individual.net i2CXfKQPVzZ9FClGz7Gs1gt5cGAq7R3dW/BAye37oj4/k3p9nA
Cancel-Lock: sha1:PhaKPI7kAp+LvuuJT1aa/gCuP34=
User-Agent: Mozilla Thunderbird 1.0.5 (Macintosh/20050711)
X-Accept-Language: en-us, en
In-Reply-To: <mailman.1071.1310749444.1164.python-list@python.org>
Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:9591

Ethan Furman wrote:
> some 
> of the return values (Logical, Date, DateTime, and probably Character) 
> will have their own dedicated singletons (Null, NullDate, NullDateTime, 
> NullChar -- which will all compare equal to None)

That doesn't seem like a good idea to me. It's common practice
to use 'is' rather than '==' when comparing things to None.

Why do you want to use special null values for these types?

-- 
Greg