Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!xlned.com!feeder7.xlned.com!news2.euro.net!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 0.011 X-Spam-Evidence: '*H*': 0.98; '*S*': 0.00; 'parser': 0.07; 'classes.': 0.09; 'tmp': 0.09; 'subject:question': 0.10; 'cc:addr:python- list': 0.11; '(defined': 0.16; 'library).': 0.16; 'pythonic': 0.16; 'subject:class': 0.16; '{})': 0.16; 'wrote:': 0.18; 'module': 0.19; 'cc:addr:python.org': 0.22; 'this?': 0.23; 'cc:2**0': 0.24; "i've": 0.25; 'this:': 0.26; 'pass': 0.26; 'header:In-Reply-To:1': 0.27; 'external': 0.29; 'tim': 0.29; 'message-id:@mail.gmail.com': 0.30; 'lines': 0.31; 'that.': 0.31; 'bunch': 0.31; 'extending': 0.31; 'way?': 0.31; 'class': 0.32; 'classes': 0.35; 'created': 0.35; 'something': 0.35; 'but': 0.35; 'received:google.com': 0.35; 'there': 0.35; 'earth': 0.36; 'surely': 0.36; 'doing': 0.36; 'same.': 0.38; 'name': 0.63; 'more': 0.64; 'to:addr:gmail.com': 0.65; 'behavior': 0.77; '2013': 0.98 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc:content-type:content-transfer-encoding; bh=J2/h1sv7y8KgtKIMNhyvQmgd5ZNOtT2lI+oRBaZdgOg=; b=yEuVxrl1Cxs+1tggFzE4Yr8Kb5Zz9WDWcLD5QlY+vzuzdb1M+Cr54wSJ+XNaKBnqgr 1REubMlvxzvAUurJot2c0BQOa7cKQTL7170IXAOQ2vSK7DDen72227uBStesQUA054bx HymR6H4TIYiQysj+lGtcgbDjujzpqZA0vR2T/GzYirCxxmZRDygzToO189oZ5M87zw1O E7Vpj4cai3mOTjNOhY65PRkA2/DB6JBelOg5Oj1bv8Pj2rNV8060lT+hwP6mWxTAAmYM iAYeB2DwhVugRxoNstSLqwuO10xSn3dLEKmQ1oO9zIUWfjY+sm91R49zyPVbOtP2qsPR FSfQ== X-Received: by 10.152.121.73 with SMTP id li9mr4258974lab.42.1372339050735; Thu, 27 Jun 2013 06:17:30 -0700 (PDT) MIME-Version: 1.0 In-Reply-To: <138ce5a8-1b4c-49d4-8005-d5f4642dcb97@googlegroups.com> References: <138ce5a8-1b4c-49d4-8005-d5f4642dcb97@googlegroups.com> From: Joshua Landau Date: Thu, 27 Jun 2013 14:16:50 +0100 Subject: Re: class factory question To: Tim Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Cc: python-list 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: 22 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1372339429 news.xs4all.nl 15951 [2001:888:2000:d::a6]:35352 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:49321 On 26 June 2013 14:09, Tim wrote: > I am extending a parser and need to create many classes that are all subc= lassed from the same object (defined in an external library). When my modu= le is loaded I need all the classes to be created with a particular name bu= t the behavior is all the same. Currently I have a bunch of lines like this= : > > class Vspace(Base.Command): pass > class Boldpath(Base.Command): pass > > There are a bunch of lines like that. > Is there a better way? Something like > > newclasses =3D ['Vspace', 'Boldpath', ... ] > for name in newclasses: > tmp =3D type(name, (Base.Command,) {}) > tmp.__name__ =3D name > > Is there a more pythonic way? I've just realised -- why on earth are you doing this? Surely there's a better way than having 50 identical classes. :/