Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!feeds.phibee-telecom.net!newsfeed.xs4all.nl!newsfeed4.news.xs4all.nl!xs4all!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 0.000 X-Spam-Evidence: '*H*': 1.00; '*S*': 0.00; 'cpython': 0.05; 'interpreter': 0.05; 'python3': 0.07; 'see:': 0.07; 'received:80.91': 0.09; 'received:80.91.229': 0.09; 'received:gmane.org': 0.09; 'received:list': 0.09; 'python': 0.11; 'def': 0.12; 'suggest': 0.14; 'ast': 0.16; 'received:80.91.229.3': 0.16; 'received:dip0.t-ipconnect.de': 0.16; 'received:plane.gmane.org': 0.16; 'received:t-ipconnect.de': 0.16; 'wrote:': 0.18; '>>>': 0.22; 'import': 0.22; 'tests': 0.22; 'header:User-Agent:1': 0.23; 'integer': 0.24; 'header:X -Complaints-To:1': 0.27; 'program,': 0.31; 'clever': 0.31; 'linux': 0.33; 'something': 0.35; 'to:addr:python-list': 0.38; 'fact': 0.38; 'to:addr:python.org': 0.39; 'received:org': 0.40; 'expression': 0.60; 'more': 0.64; 'potentially': 0.81; '2014,': 0.84 X-Injected-Via-Gmane: http://gmane.org/ To: python-list@python.org From: Peter Otten <__peter__@web.de> Subject: Re: (-1)**1000 Date: Wed, 22 Oct 2014 11:13:54 +0200 Organization: None References: <54476a77$0$21664$426a74cc@news.free.fr> Mime-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7Bit X-Gmane-NNTP-Posting-Host: p57bd9a9d.dip0.t-ipconnect.de User-Agent: KNode/4.13.3 X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.15 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: 26 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1413969248 news.xs4all.nl 2879 [2001:888:2000:d::a6]:50764 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:79420 ast wrote: > If i am writing (-1)**1000 on a python program, will the > interpreter do (-1)*(-1)*...*(-1) or something clever ? > > In fact i have (-1)**N with N an integer potentially big. > > I do some tests that suggest that Python is clever Let's see: $ python3 Python 3.4.0 (default, Apr 11 2014, 13:05:11) [GCC 4.8.2] on linux Type "help", "copyright", "credits" or "license" for more information. >>> import dis >>> def f(): ... return (-1)**1000 ... >>> dis.dis(f) 2 0 LOAD_CONST 4 (1) 3 RETURN_VALUE So yes, CPython replaces the expression (-1)**1000 with its value during compilation.