Re: Equivalent code to the bool() built-in function

Path	csiph.com!x330-a1.tempe.blueboxinc.net!usenet.pasdenom.info!aioe.org!feeder.news-service.com!feeder2.cambriumusenet.nl!feed.tweaknews.nl!194.109.133.84.MISMATCH!newsfeed.xs4all.nl!newsfeed5.news.xs4all.nl!xs4all!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail
Return-Path	<rosuav@gmail.com>
X-Original-To	python-list@python.org
Delivered-To	python-list@mail.python.org
X-Spam-Status	OK 0.024
X-Spam-Evidence	'H': 0.95; 'S': 0.00; 'int': 0.05; 'values,': 0.09; 'pm,': 0.11; 'wrote:': 0.14; 'boolean': 0.16; 'expressions,': 0.16; 'subject:() ': 0.16; 'subject:function': 0.16; 'tue,': 0.20; 'header:In-Reply-To:1': 0.22; 'received:209.85.214.174': 0.23; 'received:mail- iw0-f174.google.com': 0.23; 'subject:code': 0.23; 'message- id:@mail.gmail.com': 0.28; 'variables': 0.29; 'to:addr:python- list': 0.32; 'received:209.85': 0.37; 'apr': 0.38; 'received:google.com': 0.38; 'but': 0.38; 'unless': 0.38; 'received:209.85.214': 0.39; 'to:addr:python.org': 0.39; 'could': 0.39; 'received:209': 0.39; 'header:Received:5': 0.40; '2011': 0.62; 'guarantee': 0.75; 'sum': 0.89
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:content-transfer-encoding; bh=lyUe6IADoMBzM+6ya/YM7NwtpM1Li2lMmJ1cc23SPhg=; b=vKWcGTZx08KnFDr00jJOipg4nISSw9XQ0/rs8hejYTwtX8fi4ev4+vZZtoWIcZf0y8 powToEjXbLK05w80zIIxDTfqpmrmW38LONKqruXw9+XhgyJ4MRkZgz+1u8s6SfstAOUH eGhoLCGAyvxnYVKEUFMjcBAk/bmFfmXvYFRHA=
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:content-transfer-encoding; b=KWlPVI8s6F2xfgzfPph6tb8rf+EG3YopJWFyOQlViu3kuDcWQtec9L29Lq9ngRHXEh 9/UXstbaaPWHm+rdNkBtlunH9y7zyg52ok614ktAQBt5zVwxIKseMp0VhCwJpGxijI+7 kM3O2qmOZp7rD9N5PZ8wnblU9qNhXYnwG58Lo=
MIME-Version	1.0
In-Reply-To	<BANLkTi=C9nz7zVvBr0nPMiKgO9hkWo2uKA@mail.gmail.com>
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> <mailman.453.1303029985.9059.python-list@python.org> <911dvfF6ocU1@mid.individual.net> <4dac97ca$0$10609$742ec2ed@news.sonic.net> <ioip56$btd$1@dough.gmane.org> <BANLkTi=C9nz7zVvBr0nPMiKgO9hkWo2uKA@mail.gmail.com>
Date	Tue, 19 Apr 2011 16:26:50 +1000
Subject	Re: Equivalent code to the bool() built-in function
From	Chris Angelico <rosuav@gmail.com>
To	python-list@python.org
Content-Type	text/plain; charset=ISO-8859-1
Content-Transfer-Encoding	quoted-printable
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.549.1303194413.9059.python-list@python.org> (permalink)
Lines	14
NNTP-Posting-Host	82.94.164.166
X-Trace	1303194413 news.xs4all.nl 81482 [::ffff:82.94.164.166]:44378
X-Complaints-To	abuse@xs4all.nl
Xref	x330-a1.tempe.blueboxinc.net comp.lang.python:3542

Show key headers only | View raw

On Tue, Apr 19, 2011 at 4:23 PM, Kushal Kumaran
<kushal.kumaran+python@gmail.com> wrote:
>> if a + b + c + d != 1:
>>    raise ValueError("Exactly one of a, b, c or d must be true.")
>>
>
> Unless you're sure all of a, b, c, and d are boolean values, an int
> with a negative value slipping in could result in the sum equaling 1,
> but more than one of the variables evaluating to True in boolean
> contexts.

If they're all expressions, then you can easily guarantee that.

ChrisA

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

Thread

Equivalent code to the bool() built-in function candide <candide@free.invalid> - 2011-04-16 22:24 +0200
  Re: Equivalent code to the bool() built-in function Chris Rebert <clp2@rebertia.com> - 2011-04-16 13:58 -0700
    Re: Equivalent code to the bool() built-in function Ben Finney <ben+python@benfinney.id.au> - 2011-04-17 07:38 +1000
      Re: Equivalent code to the bool() built-in function candide <candide@free.invalid> - 2011-04-17 01:51 +0200
        Re: Equivalent code to the bool() built-in function Chris Rebert <clp2@rebertia.com> - 2011-04-16 17:16 -0700
        Re: Equivalent code to the bool() built-in function Ben Finney <ben+python@benfinney.id.au> - 2011-04-17 12:39 +1000
          Re: Equivalent code to the bool() built-in function candide <candide@free.invalid> - 2011-04-17 10:38 +0200
            Re: Equivalent code to the bool() built-in function Chris Angelico <rosuav@gmail.com> - 2011-04-17 18:46 +1000
              Re: Equivalent code to the bool() built-in function Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2011-04-18 12:12 +1200
                Re: Equivalent code to the bool() built-in function John Nagle <nagle@animats.com> - 2011-04-18 12:58 -0700
                Re: Equivalent code to the bool() built-in function Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2011-04-19 12:18 +1200
                Re: Equivalent code to the bool() built-in function Christian Heimes <lists@cheimes.de> - 2011-04-19 03:39 +0200
                Re: Equivalent code to the bool() built-in function Kushal Kumaran <kushal.kumaran+python@gmail.com> - 2011-04-19 11:53 +0530
                Re: Equivalent code to the bool() built-in function Grant Edwards <invalid@invalid.invalid> - 2011-04-19 14:23 +0000
                Re: Equivalent code to the bool() built-in function Jean-Paul Calderone <calderone.jeanpaul@gmail.com> - 2011-04-19 08:43 -0700
                Re: Equivalent code to the bool() built-in function Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2011-04-20 11:59 +1200
                Re: Equivalent code to the bool() built-in function Chris Angelico <rosuav@gmail.com> - 2011-04-19 16:26 +1000
                Re: Equivalent code to the bool() built-in function Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-04-19 08:43 +0000
                Re: Equivalent code to the bool() built-in function Chris Angelico <rosuav@gmail.com> - 2011-04-19 19:00 +1000
                Re: Equivalent code to the bool() built-in function Westley Martínez <anikom15@gmail.com> - 2011-04-19 06:43 -0700
            Re: Equivalent code to the bool() built-in function Ben Finney <ben+python@benfinney.id.au> - 2011-04-17 19:46 +1000
              Re: Equivalent code to the bool() built-in function candide <candide@free.invalid> - 2011-04-18 01:22 +0200
                Re: Equivalent code to the bool() built-in function Ben Finney <ben+python@benfinney.id.au> - 2011-04-18 09:46 +1000
                Re: Equivalent code to the bool() built-in function Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2011-04-18 12:08 +1200
                Re: Equivalent code to the bool() built-in function Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-04-18 00:22 +0000
                Re: Equivalent code to the bool() built-in function Chris Angelico <rosuav@gmail.com> - 2011-04-18 10:52 +1000
                Re: Equivalent code to the bool() built-in function Duncan Booth <duncan.booth@invalid.invalid> - 2011-04-18 10:01 +0000
            Re: Equivalent code to the bool() built-in function Daniel Kluev <dan.kluev@gmail.com> - 2011-04-17 21:11 +1100
      Re: Equivalent code to the bool() built-in function Daniel Kluev <dan.kluev@gmail.com> - 2011-04-18 10:45 +1100
        Re: Equivalent code to the bool() built-in function Ben Finney <ben+python@benfinney.id.au> - 2011-04-18 10:36 +1000
      Re: Re: Equivalent code to the bool() built-in function Chris Angelico <rosuav@gmail.com> - 2011-04-18 11:52 +1000
      Re: Re: Equivalent code to the bool() built-in function Dave Angel <davea@ieee.org> - 2011-04-17 21:46 -0400
      Re: Re: Equivalent code to the bool() built-in function Daniel Kluev <dan.kluev@gmail.com> - 2011-04-18 14:16 +1100
      Re: Equivalent code to the bool() built-in function Ned Deily <nad@acm.org> - 2011-04-17 21:40 -0700
      Re: Equivalent code to the bool() built-in function Chris Angelico <rosuav@gmail.com> - 2011-04-18 14:53 +1000
        Re: Equivalent code to the bool() built-in function Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2011-04-19 12:22 +1200
      Re: Equivalent code to the bool() built-in function Chris Rebert <clp2@rebertia.com> - 2011-04-17 22:49 -0700
        Re: Equivalent code to the bool() built-in function Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-04-18 06:14 +0000
      Re: Equivalent code to the bool() built-in function Chris Angelico <rosuav@gmail.com> - 2011-04-18 16:03 +1000
  Re: Equivalent code to the bool() built-in function Ben Finney <ben+python@benfinney.id.au> - 2011-04-17 07:13 +1000
    Re: Equivalent code to the bool() built-in function candide <candide@free.invalid> - 2011-04-17 01:51 +0200
  Re: Equivalent code to the bool() built-in function Raymond Hettinger <python@rcn.com> - 2011-04-18 01:33 -0700
    Re: Equivalent code to the bool() built-in function candide <candide@free.invalid> - 2011-04-18 11:19 +0200

csiph-web