Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!xlned.com!feeder1.xlned.com!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 0.011 X-Spam-Evidence: '*H*': 0.98; '*S*': 0.00; 'operator': 0.03; 'subject:Python': 0.06; 'none,': 0.07; 'python': 0.11; '"is"': 0.16; 'escribi\xf3:': 0.16; 'list)': 0.16; 'thanks.': 0.20; 'example': 0.22; 'header:User-Agent:1': 0.23; 'compare': 0.26; 'header:In-Reply-To:1': 0.27; 'tim': 0.29; 'list:': 0.30; 'chase': 0.31; 'exceptions': 0.31; 'basic': 0.35; 'but': 0.35; 'received:google.com': 0.35; 'there': 0.35; 'doing': 0.36; 'clear': 0.37; 'message-id:@gmail.com': 0.38; 'to:addr:python- list': 0.38; 'anything': 0.39; 'to:addr:python.org': 0.39; "you're": 0.61; 'more': 0.64 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=message-id:date:from:user-agent:mime-version:to:subject:references :in-reply-to:content-type:content-transfer-encoding; bh=LUwa0Ch9SoX/zV/aw1HEUL3MtEC6a6yHazvuunk9jQs=; b=e2HcZfb/6X4AXR3O4uO6pOLlwOVZjK2ZEwLkxMnXlsYa6aB4rt7SsrZ64YLi2xy5Gw IDZ2BCQ/XY23I40xE7rGCuxi5EW2SeY5n5x/ayZ+1qNCPWXlCFMMpNCoha6YNfCbELtv hcTuHg9+8YsUi9EJaU1MF73tEK0Rfap2pKDGrGWCdtknIGh/6Htw67rmNHH1BkKth4/o SdJqPwK9oCKJQBdUPS9LDy1LYCsdZqH4gpqLVeSFHpZS2WNKwfvdGA0P+jUOMsGr5TRf zGe5COhM4w5BJvHh2qk//YXPsJP1HjWRWZXQhbhvHfa9H1y27U1YLBqOLWmsOYntD1jw R5fQ== X-Received: by 10.194.235.138 with SMTP id um10mr3215191wjc.30.1376157662334; Sat, 10 Aug 2013 11:01:02 -0700 (PDT) Date: Sat, 10 Aug 2013 20:00:58 +0200 From: Xavi User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:17.0) Gecko/20130801 Thunderbird/17.0.8 MIME-Version: 1.0 To: python-list@python.org Subject: Re: Python Basic Doubt References: <20130810114040.6ac78fe8@bigbox.christie.dr> In-Reply-To: <20130810114040.6ac78fe8@bigbox.christie.dr> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Mailman-Approved-At: Sat, 10 Aug 2013 20:03:25 +0200 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: 20 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1376157806 news.xs4all.nl 15982 [2001:888:2000:d::a6]:49203 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:52313 Hello, El 10/08/2013 18:40, Tim Chase escribió: > Generally, if you are using the "is" operator to compare against > anything other than None, you're doing it wrong. There are exceptions > to this, but it takes knowing the particulars. Now I have one doubt, I use 'is' to compare basic types in python 3, for example .- v = [] if type(v) is list: print('Is list...') Because I think it is more clear and faster than .- type(v) == [].__class__ ... or ... isinstance(v, list) Is this correct? Thanks. -- Xavi