Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]


Groups > comp.lang.python > #18945

Re: NaN, Null, and Sorting

Path csiph.com!x330-a1.tempe.blueboxinc.net!usenet.pasdenom.info!gegeweb.42!gegeweb.eu!gegeweb.org!de-l.enfer-du-nord.net!feeder1.enfer-du-nord.net!tudelft.nl!txtfeed1.tudelft.nl!newsfeed10.multikabel.net!multikabel.net!newsfeed20.multikabel.net!news2.euro.net!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail
Return-Path <python@mrabarnett.plus.com>
X-Original-To python-list@python.org
Delivered-To python-list@mail.python.org
X-Spam-Status OK 0.004
X-Spam-Evidence '*H*': 0.99; '*S*': 0.00; "(i'm": 0.09; 'comparisons': 0.09; 'from:addr:python': 0.09; 'am,': 0.12; 'adopted': 0.16; 'first"': 0.16; 'from:addr:mrabarnett.plus.com': 0.16; 'from:name:mrab': 0.16; 'message-id:@mrabarnett.plus.com': 0.16; 'received:84.92': 0.16; 'received:84.92.122': 0.16; 'received:84.92.122.60': 0.16; 'received:84.93': 0.16; 'received:84.93.230': 0.16; 'reply-to:addr:python-list': 0.16; 'wrote:': 0.16; 'jan': 0.19; 'header:In-Reply-To:1': 0.22; 'clause': 0.23; 'sat,': 0.25; 'chris': 0.30; 'pretty': 0.30; 'implementing': 0.32; 'objects': 0.32; 'sort': 0.32; 'header:User- Agent:1': 0.33; 'to:addr:python-list': 0.33; 'received:84': 0.34; 'view,': 0.34; 'null': 0.34; 'reply-to:addr:python.org': 0.34; 'towards': 0.35; 'subject:: ': 0.39; 'to:addr:python.org': 0.40; 'together.': 0.40; 'more': 0.61; 'choose': 0.62; 'header:Reply- To:1': 0.71; 'reply-to:no real name:2**0': 0.72
X-CM-Score 0.00
X-CNFS-Analysis v=2.0 cv=J8QoHXbS c=1 sm=1 a=0nF1XD0wxitMEM03M9B4ZQ==:17 a=9jsOeB20M3cA:10 a=OUOv7kDek9cA:10 a=8nJEP1OIZ-IA:10 a=95QSvBWzPwBvcvh1AgEA:9 a=wPNLvfGTeEIA:10 a=ExiFL-q3zkAA:10 a=0nF1XD0wxitMEM03M9B4ZQ==:117
X-AUTH mrabarnett:2500
Date Fri, 13 Jan 2012 21:06:46 +0000
From MRAB <python@mrabarnett.plus.com>
User-Agent Mozilla/5.0 (Windows NT 5.1; rv:8.0) Gecko/20111105 Thunderbird/8.0
MIME-Version 1.0
To python-list@python.org
Subject Re: NaN, Null, and Sorting
References <4F108050.4030407@stoneleaf.us> <CAPTjJmr2VT_Z_HpvRbY1yQAmh4drkjHZjxFa1aeqR5d8cSn3tw@mail.gmail.com>
In-Reply-To <CAPTjJmr2VT_Z_HpvRbY1yQAmh4drkjHZjxFa1aeqR5d8cSn3tw@mail.gmail.com>
Content-Type text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding 7bit
X-BeenThere python-list@python.org
X-Mailman-Version 2.1.12
Precedence list
Reply-To python-list@python.org
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.4730.1326488798.27778.python-list@python.org> (permalink)
Lines 11
NNTP-Posting-Host 2001:888:2000:d::a6
X-Trace 1326488798 news.xs4all.nl 6967 [2001:888:2000:d::a6]:56068
X-Complaints-To abuse@xs4all.nl
Xref x330-a1.tempe.blueboxinc.net comp.lang.python:18945

Show key headers only | View raw


On 13/01/2012 19:58, Chris Angelico wrote:
> On Sat, Jan 14, 2012 at 6:04 AM, Ethan Furman<ethan@stoneleaf.us>  wrote:
>>  So I am strongly leaning towards implementing the comparisons such that Null
>>  objects are less than other objects so they will always sort together.
>
> This is a perfectly plausible view, and is the one adopted by SQL (I'm
> pretty sure the "NULLS FIRST" / "NULLS LAST" clause is standard - you
> get to choose whether they're less than everything or more than
> everything).
>
+1

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


Thread

Re: NaN, Null, and Sorting MRAB <python@mrabarnett.plus.com> - 2012-01-13 21:06 +0000

csiph-web