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!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 0.018 X-Spam-Evidence: '*H*': 0.96; '*S*': 0.00; 'python,': 0.02; 'expressions': 0.07; '(via': 0.16; 'ported': 0.16; 'to:name:python list': 0.16; 'first.': 0.19; 'tests': 0.22; 'java': 0.24; 'second': 0.26; 'idea': 0.28; 'message-id:@mail.gmail.com': 0.30; "i'm": 0.30; 'code': 0.31; 'equality': 0.31; 'thanks!': 0.32; 'but': 0.35; 'received:google.com': 0.35; 'unit': 0.37; 'two': 0.37; 'to:addr:python-list': 0.38; 'to:addr:python.org': 0.39; 'above,': 0.60; 'expression': 0.60 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:date:message-id:subject:from:to:content-type; bh=0EhwIv8wTwWAHKzfCm8xg/kazb5AXTtHg8Qtyhve4sE=; b=RZV3exVQZNcYwMLsDgsH5MQmhFKZENcKbTvfDvSvzXqrF3+LmHCMjzzAWUF13iKo5u suwpokpjZV4xLNAUE7BmPStgulpuDNBm1T6cTNSTtVsyN4aMAEJoNv0PitlJPKsL8dJS 7ChW/OmBGYN2O5LVEfor8dIAveaTHOShV7NTAaDFvJ257//8WJC/M8YwKwzqWPV3htfT hLlTyhrsz3kpr7nNneOivEgux+n6fybHa1JMZU0Zczk8WbisrZ7EjM8hg0REyOawu5c9 Li56yjBGZr0mcRxkNGO4GcOWHbRkGnnPhmdm3HRo3sgDO7XFbAXyvNeu+c3vXV+/AsvV A7vA== MIME-Version: 1.0 X-Received: by 10.152.203.231 with SMTP id kt7mr5684217lac.84.1414368749083; Sun, 26 Oct 2014 17:12:29 -0700 (PDT) Date: Sun, 26 Oct 2014 17:12:29 -0700 Subject: id == vs is From: Dan Stromberg To: Python List Content-Type: text/plain; charset=UTF-8 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: 1414368757 news.xs4all.nl 2860 [2001:888:2000:d::a6]:32773 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:79733 Are the following two expressions the same? x is y Id(x) == id(y) ? I ported some Java code to Python, and it was using Java's idea of equality (via ==) in some places. Right now, I have a suite of unit tests working using the second expression above, but I'm thinking about switching to the first. Thanks!