Path: csiph.com!usenet.pasdenom.info!gegeweb.org!de-l.enfer-du-nord.net!feeder1.enfer-du-nord.net!rt.uk.eu.org!nntp-feed.chiark.greenend.org.uk!ewrotcd!news.nosignal.org!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail
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 0.015
X-Spam-Evidence: '*H*': 0.97; '*S*': 0.00; 'nested': 0.07; '%s",': 0.09; 'received:80.91': 0.09; 'received:80.91.229': 0.09; 'received:gmane.org': 0.09; 'received:list': 0.09; 'restarted': 0.09; 'dec': 0.15; 'csv': 0.16; 'match:': 0.16; 'received:80.91.229.3': 0.16; 'received:plane.gmane.org': 0.16; 'subject:compare': 0.16; 'file:': 0.22; 'seems': 0.23; 'header:X -Complaints-To:1': 0.28; 'run': 0.28; 'record': 0.28; "d'aprano": 0.29; 'steven': 0.29; "i'm": 0.29; 'code': 0.31; 'url:home': 0.33; 'to:addr:python-list': 0.33; 'received:org': 0.36; 'but': 0.36; 'compare': 0.36; 'charset:us-ascii': 0.36; 'two': 0.37; 'subject:: ': 0.38; 'to:addr:python.org': 0.39; 'where': 0.40; 'header:Received:5': 0.40; 'prices': 0.62; 'price': 0.66; 'as:': 0.75; 'basically,': 0.84; 'database:': 0.84; 'dennis': 0.91; 'received:108': 0.91
X-Injected-Via-Gmane: http://gmane.org/
To: python-list@python.org
From: Dennis Lee Bieber <wlfraed@ix.netcom.com>
Subject: Re: Confused compare function :)
Date: Thu, 06 Dec 2012 13:41:05 -0500
Organization: > Bestiaria Support Staff <
References: <CAKhY55PXaMkdnW7qMb-5ConHMcz05Gnkqw4wvyoprBFBd5UFFw@mail.gmail.com> <mailman.538.1354753193.29569.python-list@python.org> <50bfe9d8$0$29994$c3e8da3$5496439d@news.astraweb.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Gmane-NNTP-Posting-Host: 108.73.119.194
X-Newsreader: Forte Agent 3.3/32.846
X-No-Archive: YES
X-BeenThere: python-list@python.org
X-Mailman-Version: 2.1.15
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.580.1354819258.29569.python-list@python.org>
Lines: 25
NNTP-Posting-Host: 2001:888:2000:d::a6
X-Trace: 1354819258 news.xs4all.nl 6844 [2001:888:2000:d::a6]:53683
X-Complaints-To: abuse@xs4all.nl
Xref: csiph.com comp.lang.python:34416

On 06 Dec 2012 00:42:00 GMT, Steven D'Aprano
<steve+comp.lang.python@pearwood.info> declaimed the following in
gmane.comp.python.general:

> But basically, the code seems to run a pair of nested for-loops:
> 
> for SKU in database:
>     for SKU in csv file:
>         if the two SKUs match:
>             compare their prices and update the database
>
	OUCH...

	I'm presuming the CSV is restarted each time the database record
changes...

	That would seem better reformulated as:

	for (SKU, price) in CSV:
		DB.execute("update SKUtable set price = %s where SKU = %s",
						(price, SKU)	)
-- 
	Wulfraed                 Dennis Lee Bieber         AF6VN
        wlfraed@ix.netcom.com    HTTP://wlfraed.home.netcom.com/