Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!bcyclone05.am1.xlned.com!bcyclone05.am1.xlned.com!newsfeed.xs4all.nl!newsfeed1.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 0.007 X-Spam-Evidence: '*H*': 0.99; '*S*': 0.00; 'expressions': 0.07; 'dan': 0.09; 'from:addr:ethan': 0.09; 'from:addr:stoneleaf.us': 0.09; 'from:name:ethan furman': 0.09; 'message-id:@stoneleaf.us': 0.09; '~ethan~': 0.09; 'wrote:': 0.18; 'value.': 0.19; 'header:User- Agent:1': 0.23; 'header:In-Reply-To:1': 0.27; 'could': 0.34; 'objects': 0.35; 'two': 0.37; 'represent': 0.38; 'to:addr:python- list': 0.38; 'pm,': 0.38; 'to:addr:python.org': 0.39; 'received:173': 0.61; 'different': 0.65 Date: Sun, 26 Oct 2014 17:23:32 -0700 From: Ethan Furman User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:16.0) Gecko/20121010 Thunderbird/16.0.1 MIME-Version: 1.0 To: python-list@python.org Subject: Re: id == vs is References: In-Reply-To: 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 List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Newsgroups: comp.lang.python Message-ID: Lines: 14 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1414370016 news.xs4all.nl 2947 [2001:888:2000:d::a6]:49576 X-Complaints-To: abuse@xs4all.nl X-Received-Bytes: 2454 X-Received-Body-CRC: 1769902921 Xref: csiph.com comp.lang.python:79737 On 10/26/2014 05:12 PM, Dan Stromberg wrote: > Are the following two expressions the same? > > x is y > > Id(x) == id(y) > > ? Nope. If the value if `id(x)` is not interned, then the two value could be different objects that still represent the same value. -- ~Ethan~