Re: Dictionary Views -- good examples? [was Re: Python 3 dict question]

Path	csiph.com!x330-a1.tempe.blueboxinc.net!aioe.org!feeder.news-service.com!newsfeed.xs4all.nl!newsfeed6.news.xs4all.nl!xs4all!post.news.xs4all.nl!not-for-mail
Return-Path	<ethan@stoneleaf.us>
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; 'subject:Python': 0.04; 'pep': 0.07; 'python': 0.07; 'chime': 0.09; 'from:addr:ethan': 0.09; 'from:addr:stoneleaf.us': 0.09; 'from:name:ethan furman': 0.09; 'kelly': 0.09; 'message-id:@stoneleaf.us': 0.09; 'received:gator410.hostgator.com': 0.09; '~ethan~': 0.09; 'pm,': 0.11; 'wrote:': 0.14; 'furman': 0.16; 'keys.': 0.16; 'received:72.11': 0.16; 'received:72.11.125': 0.16; 'received:72.11.125.166': 0.16; 'subject:was': 0.16; 'usage': 0.20; 'cc:2**0': 0.20; 'subject:]': 0.22; 'header:In-Reply-To:1': 0.22; 'subject:question': 0.22; 'cc:addr:python-list': 0.22; 'subject: -- ': 0.25; 'thanks.': 0.28; 'fri,': 0.29; 'cc:addr:python.org': 0.31; 'idea': 0.32; 'things': 0.33; 'header :User-Agent:1': 0.35; 'which,': 0.35; 'should': 0.37; 'lets': 0.39; 'header:Received:5': 0.40; '2011': 0.62; 'received:hostgator.com': 0.64; 'care': 0.67; 'received:websitewelcome.com': 0.71; 'lightweight': 0.84; 'received:69.93': 0.91; 'subject:\t': 0.91; 'subject:good': 0.93
Date	Tue, 10 May 2011 10:18:53 -0700
From	Ethan Furman <ethan@stoneleaf.us>
User-Agent	Thunderbird 1.5.0.10 (Windows/20070221)
MIME-Version	1.0
To	Ian Kelly <ian.g.kelly@gmail.com>
Subject	Re: Dictionary Views -- good examples? [was Re: Python 3 dict question]
References	<ded9dfa0-a031-4513-8751-7ff7bfd5dcc7@e8g2000vbz.googlegroups.com> <mailman.1262.1304711497.9059.python-list@python.org> <777641c8-4928-4e49-832a-6a4a076628d1@o26g2000vby.googlegroups.com> <BANLkTimo-LZShj2UwB0VEoRn2F14qtYgRg@mail.gmail.com> <4DC47B04.9070007@stoneleaf.us> <BANLkTimktZQsY7-oQa+zFq9wjt-KhM3i2g@mail.gmail.com>
In-Reply-To	<BANLkTimktZQsY7-oQa+zFq9wjt-KhM3i2g@mail.gmail.com>
Content-Type	text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding	7bit
X-AntiAbuse	This header was added to track abuse, please include it with any abuse report
X-AntiAbuse	Primary Hostname - gator410.hostgator.com
X-AntiAbuse	Original Domain - python.org
X-AntiAbuse	Originator/Caller UID/GID - [47 12] / [47 12]
X-AntiAbuse	Sender Address Domain - stoneleaf.us
X-Source
X-Source-Args
X-Source-Dir
Cc	Python <python-list@python.org>
X-BeenThere	python-list@python.org
X-Mailman-Version	2.1.12
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.1384.1305047221.9059.python-list@python.org> (permalink)
Lines	13
NNTP-Posting-Host	82.94.164.166
X-Trace	1305047222 news.xs4all.nl 34849 [::ffff:82.94.164.166]:43619
X-Complaints-To	abuse@xs4all.nl
Xref	x330-a1.tempe.blueboxinc.net comp.lang.python:5079

Show key headers only | View raw

Ian Kelly wrote:
> On Fri, May 6, 2011 at 4:49 PM, Ethan Furman wrote:
>> Anybody care to chime in with their usage of this construct?
> 
> You should start with PEP 3106.  The main idea is that dict.keys() and
> dict.items() can be treated as frozensets, while still being more
> lightweight than lists.  That lets you do nifty things like "a.keys()
> == b.keys()" which, if a and b are Python 3 dicts, will tell you
> whether they contain the same keys.

Cool, thanks.

~Ethan~

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

Thread

Python 3 dict question dmitrey <dmitrey15@gmail.com> - 2011-05-06 12:40 -0700
  Re: Python 3 dict question Chris Rebert <clp2@rebertia.com> - 2011-05-06 12:51 -0700
    Re: Python 3 dict question dmitrey <dmitrey15@gmail.com> - 2011-05-06 12:57 -0700
      Re: Python 3 dict question Ian Kelly <ian.g.kelly@gmail.com> - 2011-05-06 14:48 -0600
      Dictionary Views -- good examples?  [was Re: Python 3 dict question] Ethan Furman <ethan@stoneleaf.us> - 2011-05-06 15:49 -0700
        Re: Dictionary Views -- good examples?  [was Re: Python 3 dict question] Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2011-05-07 21:09 +1200
          Re: Dictionary Views -- good examples?  [was Re: Python 3 dict question] Thomas Rachel <nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915@spamschutz.glglgl.de> - 2011-05-08 11:23 +0200
      Re: Dictionary Views -- good examples? [was Re: Python 3 dict question] Ian Kelly <ian.g.kelly@gmail.com> - 2011-05-06 18:23 -0600
      Re: Dictionary Views -- good examples? [was Re: Python 3 dict question] Ethan Furman <ethan@stoneleaf.us> - 2011-05-10 10:18 -0700
  Re: Python 3 dict question Ian Kelly <ian.g.kelly@gmail.com> - 2011-05-06 14:02 -0600
  Re: Python 3 dict question Rob Wolfe <rw@smsnet.pl> - 2011-05-06 22:46 +0200
  Re: Python 3 dict question nirinA raseliarison <nirina.raseliarison@gmail.com> - 2011-05-06 14:18 -0700
  Re: Python 3 dict question Raymond Hettinger <python@rcn.com> - 2011-05-10 10:25 -0700

csiph-web