Path: csiph.com!x330-a1.tempe.blueboxinc.net!usenet.pasdenom.info!gegeweb.org!de-l.enfer-du-nord.net!feeder1.enfer-du-nord.net!tudelft.nl!txtfeed1.tudelft.nl!newsfeed10.multikabel.net!multikabel.net!newsfeed20.multikabel.net!news2.euro.net!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail Return-Path: X-Original-To: python-list@python.org Delivered-To: python-list@mail.python.org X-Spam-Status: OK 0.004 X-Spam-Evidence: '*H*': 0.99; '*S*': 0.00; 'interpreter': 0.05; 'subject:while': 0.07; 'python': 0.08; 'am,': 0.12; 'received:209.85.210.174': 0.13; 'received:mail- iy0-f174.google.com': 0.13; 'boolean': 0.16; 'from:addr:rosuav': 0.16; 'from:name:chris angelico': 0.16; 'keyword.': 0.16; '\xa0for': 0.16; 'wrote:': 0.16; 'jan': 0.19; 'maybe': 0.21; "doesn't": 0.22; 'header:In-Reply-To:1': 0.22; 'wrong?': 0.23; 'tried': 0.27; 'looks': 0.27; 'code,': 0.27; 'message- id:@mail.gmail.com': 0.28; 'compile': 0.28; 'true,': 0.28; '22,': 0.30; 'sun,': 0.30; 'anyone': 0.31; 'that,': 0.32; 'to:addr :python-list': 0.33; 'received:google.com': 0.37; 'received:209.85': 0.38; 'why': 0.39; 'received:209': 0.39; 'subject:: ': 0.39; 'to:addr:python.org': 0.40; "'true'": 0.84; '12:47': 0.84; 'andrea': 0.84 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type:content-transfer-encoding; bh=UmJtKUGZonOmD2MLdX3wLOP7f7QN6e83pgiHYXpxiiw=; b=OQiik3broXReS+UoPs4xK4a3q3K8KxctLyHYXmq8bNeoiVxDAhuDu0ehQoO/sO48Um aN9uuaNX3X3YQtvzGz1RT0dOv/rm/b55muQga30j+tgGfdU5gFdqrePmZKGnOEWwdW7x CBHDFRACUjY7Dk5qUYU2ow7XhPjQ8D8SB1XU4= MIME-Version: 1.0 In-Reply-To: <4F1AC1D4.2080402@gmail.com> References: <4F1AC1D4.2080402@gmail.com> Date: Sun, 22 Jan 2012 01:59:01 +1100 Subject: Re: while True or while 1 From: Chris Angelico 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 List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Newsgroups: comp.lang.python Message-ID: Lines: 13 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1327157944 news.xs4all.nl 6896 [2001:888:2000:d::a6]:56480 X-Complaints-To: abuse@xs4all.nl Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:19190 On Sun, Jan 22, 2012 at 12:47 AM, Andrea Crotti wrote: > So I tried to do the following, and the result is surprising. =A0For what > I can see it looks like the interpreter can optimize away the 1 boolean > conversion while it doesn't with the True, the opposite of what I > supposed. > > Anyone can explain me why is that, or maybe is my conclusion wrong? In Python 3, they compile to the same code, because 'True' is a keyword. In Python 2, you can reassign True to be 0. ChrisA