Path: csiph.com!x330-a1.tempe.blueboxinc.net!usenet.pasdenom.info!aioe.org!feeder.news-service.com!newsfeed.xs4all.nl!newsfeed6.news.xs4all.nl!xs4all!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail
Return-Path: <dan.kluev@gmail.com>
X-Original-To: python-list@python.org
Delivered-To: python-list@mail.python.org
X-Spam-Status: OK 0.013
X-Spam-Evidence: '*H*': 0.97; '*S*': 0.00; 'function,': 0.07; 'repository': 0.07; 'type,': 0.07; 'python': 0.07; 'builtin': 0.09; 'sun,': 0.09; 'pm,': 0.11; 'wrote:': 0.14; 'repr': 0.16; 'subject:() ': 0.16; 'subject:function': 0.16; 'header:In-Reply- To:1': 0.22; 'subject:code': 0.23; 'pointed': 0.25; '(in': 0.27; 'function': 0.27; 'message-id:@mail.gmail.com': 0.28; 'daniel': 0.29; '17,': 0.31; 'comparison': 0.31; 'to:addr:python-list': 0.32; 'skip:& 10': 0.34; 'skip:o 20': 0.37; 'received:209.85': 0.37; 'apr': 0.38; 'received:google.com': 0.38; 'to:addr:python.org': 0.39; 'received:209': 0.39; 'header:Received:5': 0.40; 'best': 0.60; 'you.': 0.61; '2011': 0.62; 'imagine': 0.72; 'candide': 0.84; 'received:209.85.210.174': 0.84; 'received:mail-iy0-f174.google.com': 0.84
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:in-reply-to:references:date :message-id:subject:from:to:content-type; bh=obNMRlbDeyESuwT8+s3+vllD9yvwAI8mLwJ5q0dWK54=; b=BeHCBpIiBLG9OQFl8OY675VLNJgF5RRRyOnQ5yfmiUrLo/BfDbut+LIsmAdeigvAvo VtT8s4mPcyaaErwMv0v+DhAjiWNwm2cc3w2RDZdMKdcJ2I0Rn0YJ65vKLhecTNegAze9 ey67DtAJIliyj1Zf56WizkZp+mj5l9genjt/o=
DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; b=txlQtO3LDsIPY2nzMcdB8cILSsjPjM3KYPTao9ST1I3pZh9If1KbNJdIim4wuyvmq0 P6PBxezalfViX+TH+JiML6uWovDV8WOcCI9ZMnem9ODt0RVIyaZMSTuosZHmxpW5cMcd R1SzBijWA0CLNfzzW+FhCtC8Cveof13el35fY=
MIME-Version: 1.0
In-Reply-To: <4daaa6f6$0$20187$426a74cc@news.free.fr>
References: <4da9fb0b$0$13696$426a74cc@news.free.fr> <mailman.442.1302987518.9059.python-list@python.org> <87k4etho6e.fsf@benfinney.id.au> <4daa2b72$0$32037$426a74cc@news.free.fr> <87d3klha85.fsf@benfinney.id.au> <4daaa6f6$0$20187$426a74cc@news.free.fr>
Date: Sun, 17 Apr 2011 21:11:55 +1100
Subject: Re: Equivalent code to the bool() built-in function
From: Daniel Kluev <dan.kluev@gmail.com>
To: python-list@python.org
Content-Type: text/plain; charset=ISO-8859-1
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.457.1303035118.9059.python-list@python.org>
Lines: 15
NNTP-Posting-Host: 82.94.164.166
X-Trace: 1303035118 news.xs4all.nl 81478 [::ffff:82.94.164.166]:57528
X-Complaints-To: abuse@xs4all.nl
Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:3388

On Sun, Apr 17, 2011 at 7:38 PM, candide <candide@free.invalid> wrote:
> I could't imagine a builtin function having a so trivial implementation.

As it was pointed out, its not function, its type,
SETBUILTIN("bool",                  &PyBool_Type);

While its __new__ is indeed trivial (in essence, it just calls
PyObject_IsTrue), it also provides needed comparison ops, repr and
other magic methods for the type.
You can check Objects/boolobject.c in python repository if its
implementation is interesting for you.

-- 
With best regards,
Daniel Kluev