Path: csiph.com!usenet.pasdenom.info!weretis.net!feeder1.news.weretis.net!feeder.erje.net!eu.feeder.erje.net!xlned.com!feeder1.xlned.com!news2.euro.net!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail
Return-Path: <msirenef@lightbird.net>
X-Original-To: python-list@python.org
Delivered-To: python-list@mail.python.org
X-Spam-Status: OK 0.032
X-Spam-Evidence: '*H*': 0.95; '*S*': 0.01; 'mentioned,': 0.07; 'arguments': 0.09; 'constructor': 0.09; 'python:': 0.09; 'themselves,': 0.09; 'subject:question': 0.10; '>on': 0.16; '>the': 0.16; 'dict': 0.16; 'identifiers,': 0.16; 'nevertheless': 0.16; 'received:74.55.86': 0.16; 'received:74.55.86.74': 0.16; 'received:smtp.webfaction.com': 0.16; 'received:webfaction.com': 0.16; 'wrote:': 0.18; 'header:User-Agent:1': 0.23; 'header:In- Reply-To:1': 0.27; 'am,': 0.29; 'thus': 0.29; 'easier': 0.31; 'keys': 0.31; 'steven': 0.31; 'yes.': 0.31; 'there': 0.35; 'keyword': 0.36; 'skip:> 10': 0.36; 'feed': 0.38; 'to:addr:python- list': 0.38; 'bad': 0.39; 'to:addr:python.org': 0.39; 'even': 0.60; 'most': 0.60; "you're": 0.61; 'skip:n 10': 0.64; 'more': 0.64; 'dict()': 0.84; 'judges': 0.84; 'carlos': 0.91; 'on?': 0.91; 'convinced': 0.93; '2013': 0.98
Date: Tue, 04 Jun 2013 13:16:36 -0400
From: Mitya Sirenef <msirenef@lightbird.net>
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130510 Thunderbird/17.0.6
MIME-Version: 1.0
To: python-list@python.org
Subject: Re: Beginner question
References: <323f2f5b-1f50-4689-90b8-74c411e43971@googlegroups.com>, <vg3hahefhel.fsf@coffee.modeemi.fi>, <1ba2ceec-f778-4c95-bf98-260fc48b4c3f@googlegroups.com>, <CAPTjJmrM=ai3g2XXSSULYvxdJKhvoTe61PefFC3tc20i5ajhHA@mail.gmail.com>, <kokblm$eb0$1@ger.gmane.org>, <BLU176-W409F23043AF5028FCB3D50D79E0@phx.gbl>, <CAA=1kxQFcMgSJ2_eD00B35V31WpbFiQ6LR=oBzrigg=8QoafCA@mail.gmail.com> <BLU176-W328C47391F61A540801441D79E0@phx.gbl>
In-Reply-To: <BLU176-W328C47391F61A540801441D79E0@phx.gbl>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
X-BeenThere: python-list@python.org
X-Mailman-Version: 2.1.15
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.2667.1370366201.3114.python-list@python.org>
Lines: 40
NNTP-Posting-Host: 2001:888:2000:d::a6
X-Trace: 1370366201 news.xs4all.nl 16004 [2001:888:2000:d::a6]:42571
X-Complaints-To: abuse@xs4all.nl
Xref: csiph.com comp.lang.python:46943

On 06/04/2013 07:53 AM, Carlos Nepomuceno wrote:
> >On 4 Jun 2013 12:28,  "Carlos Nepomuceno" <carlosnepomuceno@outlook.com> wrote:
 > [...]
 > >> What's going on? Is there a way to make dict() to resolve the 
variables?
 > >Well yes.
 > >dict(**{a:0,b:1})
 > >The dict() constructor makes a dictionary from keyword arguments. So 
you just have to feed it keyword arguments using **.
 > >And if you're in a bad day,
 > >dict(**locals())
 >
 > That's exactly the same!
 > >>>dict(**{a:0,b:1})=={a:0,b:1}
 > True
 >
 > Are there any benefits from using dict() instead of {}?
 >


Other than what Steven already mentioned, a big advantage is that it's
easier to make a dict if you have a lot of keys that are valid
identifiers, and it's more readable, to boot:

dict(red=1, blue=2, orange=3, violet=4, crimson=5, ...)

VS.

{'red':1, 'blue':2, 'orange':3, 'violet':4, 'crimson':5, ...}

  -m


-- 
Lark's Tongue Guide to Python: http://lightbird.net/larks/

Although the most acute judges of the witches and even the witches
themselves, were convinced of the guilt of witchery, the guilt nevertheless
was non-existent. It is thus with all guilt.  Friedrich Nietzsche