Path: csiph.com!fu-berlin.de!uni-berlin.de!not-for-mail From: Mark Lawrence Newsgroups: comp.lang.python Subject: Re: hasattr() or "x in y"? Date: Fri, 11 Mar 2016 22:05:25 +0000 Lines: 24 Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit X-Trace: news.uni-berlin.de g32TcoHHklBjjccqH8+6dw5VOo/eWH0TzKdOn/fi5pWQ== Return-Path: X-Original-To: python-list@python.org Delivered-To: python-list@mail.python.org X-Spam-Status: OK 0.013 X-Spam-Evidence: '*H*': 0.97; '*S*': 0.00; 'from:addr:yahoo.co.uk': 0.05; 'received:80.91': 0.09; 'received:80.91.229': 0.09; 'received:gmane.org': 0.09; 'received:list': 0.09; '"in"': 0.16; '2016': 0.16; 'better:': 0.16; 'received:80.91.229.3': 0.16; 'received:io': 0.16; 'received:plane.gmane.org': 0.16; 'received:psf.io': 0.16; 'wrote:': 0.16; 'language': 0.19; 'lawrence': 0.22; 'originally': 0.23; 'header:In-Reply-To:1': 0.24; 'header:User-Agent:1': 0.26; 'header:X-Complaints-To:1': 0.26; 'fri,': 0.27; "we're": 0.30; 'another': 0.32; 'language.': 0.32; 'point': 0.33; 'class': 0.33; 'view,': 0.33; 'but': 0.36; 'to:addr:python-list': 0.36; 'subject:: ': 0.37; 'received:org': 0.37; "won't": 0.38; 'mean': 0.38; 'or,': 0.38; 'to:addr:python.org': 0.40; 'mark': 0.40; 'back': 0.62; 'charset:windows-1252': 0.62; 'our': 0.64; 'mar': 0.65; 'smith': 0.76; 'dict,': 0.84; 'pythonistas,': 0.84 X-Injected-Via-Gmane: http://gmane.org/ X-Gmane-NNTP-Posting-Host: 80.234.129.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0 In-Reply-To: X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: General discussion list for the Python programming language List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Xref: csiph.com comp.lang.python:104652 On 11/03/2016 21:53, Charles T. Smith wrote: > On Fri, 11 Mar 2016 21:44:27 +0000, Charles T. Smith wrote: > >> From the performance point of view, which is better: - hasattr() >> - x in y >> >> TIA >> cts > > > I just realized that "in" won't look back through the class hierarchy... > that clearly makes them not interchangable, but given we're only > interested in the current dict... > Dict, don't you mean collection? Or, to put it another way, what exactly were you originally asking? -- My fellow Pythonistas, ask not what our language can do for you, ask what you can do for our language. Mark Lawrence