Re: Python 3: dict & dict.keys()

Path	csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!newsfeed.xs4all.nl!newsfeed1.news.xs4all.nl!xs4all!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail
Return-Path	<oscar.j.benjamin@gmail.com>
X-Original-To	python-list@python.org
Delivered-To	python-list@mail.python.org
X-Spam-Status	OK 0.014
X-Spam-Evidence	'H': 0.97; 'S': 0.00; 'explicitly': 0.05; 'subject:Python': 0.06; 'iterate': 0.09; 'skip:/ 10': 0.09; 'subject:()': 0.09; 'wrapped': 0.09; 'cc:addr:python-list': 0.11; 'python': 0.11; '24,': 0.16; 'iterated': 0.16; 'set,': 0.16; 'to:addr:web.de': 0.16; '\xa0what': 0.16; 'wrote:': 0.18; 'cc:addr:python.org': 0.22; 'looks': 0.24; '(or': 0.24; 'question': 0.24; 'cc:20': 0.24; 'cc:no real name:20': 0.24; '>': 0.26; 'header:In-Reply-To:1': 0.27; 'am,': 0.29; 'message- id:@mail.gmail.com': 0.30; 'could': 0.34; 'problem.': 0.35; 'received:google.com': 0.35; 'so,': 0.37; 'list': 0.37; 'either': 0.39; 'how': 0.40; 'identify': 0.61; 'different': 0.65; 'temporary': 0.65; 'subject: & ': 0.68; 'jul': 0.74; '7:25': 0.84; 'ethan': 0.84; 'furman': 0.84; 'oscar': 0.84; '2013': 0.98
DKIM-Signature	v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; bh=oma/e9HjCrVox4K/rf5N00auu8evM7c8OjWHQu063Rc=; b=a5FHnkR6AvHvZ1IWP3WZOHIwkv47eEMAzZcuZbAquJhx/YtbY50S1QQ2Mo8srrH8PS OLXJjd9Y5BvV626E0G0vCwTH3Ypaipty0DRCja71IaWDngtRowhFyq4cnZglHXnL/0eH 6731jO8JNHrOQKTPgnMM3M3A+k82czbILLP5/700ODUjRSjHrSPiDft8PUPqsXC3WIyQ 1a2NVGow4z6TJNTPOISy2HFFUe7nj1xuuHIGtiPMrYjyT03j1MD85FqBgCnc4x3Y1rpa tg4XbcBO6IcgKNY22V4O2g2FfBb4/eksm/E8BNNlUB43WRvOi9ZtbkAseT6qOawKJdjm RRGw==
MIME-Version	1.0
X-Received	by 10.68.225.197 with SMTP id rm5mr42314327pbc.159.1374670294785; Wed, 24 Jul 2013 05:51:34 -0700 (PDT)
In-Reply-To	<ksnrr9$k4t$1@ger.gmane.org>
References	<51EF2AD8.3080105@stoneleaf.us> <ksnrr9$k4t$1@ger.gmane.org>
Date	Wed, 24 Jul 2013 13:51:34 +0100
Subject	Re: Python 3: dict & dict.keys()
From	Oscar Benjamin <oscar.j.benjamin@gmail.com>
To	Peter Otten <__peter__@web.de>
Content-Type	multipart/alternative; boundary=047d7b2e073b9aa32904e2415efc
Cc	python-list@python.org
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.5033.1374670298.3114.python-list@python.org> (permalink)
Lines	48
NNTP-Posting-Host	2001:888:2000:d::a6
X-Trace	1374670298 news.xs4all.nl 15998 [2001:888:2000:d::a6]:34695
X-Complaints-To	abuse@xs4all.nl
Xref	csiph.com comp.lang.python:51127

Show key headers only | View raw

[Multipart message — attachments visible in raw view] - view raw

On Jul 24, 2013 7:25 AM, "Peter Otten" <__peter__@web.de> wrote:
>
> Ethan Furman wrote:
>
> > So, my question boils down to:  in Python 3 how is dict.keys() different
> > from dict?  What are the use cases?
>
> I just grepped through /usr/lib/python3, and could not identify a single
> line where some_object.keys() wasn't either wrapped in a list (or set,
> sorted, max) call, or iterated over.
>
> To me it looks like views are a solution waiting for a problem.

What do you mean? Why would you want to create a temporary list just to
iterate over it explicitly or implicitly (set, sorted, max,...)?

Oscar

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

Thread

Re: Python 3: dict & dict.keys() Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2013-07-24 13:51 +0100

csiph-web