Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!goblin1!goblin.stu.neva.ru!uio.no!news.tele.dk!news.tele.dk!small.news.tele.dk!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 0.005 X-Spam-Evidence: '*H*': 0.99; '*S*': 0.00; 'syntax': 0.04; 'output': 0.05; 'subject:Python': 0.06; 'nested': 0.07; 'removes': 0.07; 'input,': 0.09; 'variable,': 0.09; 'cc:addr:python-list': 0.11; 'csv': 0.16; 'input:': 0.16; 'nest': 0.16; 'stack:': 0.16; 'statements,': 0.16; 'subject:breaking': 0.16; 'wrote:': 0.18; 'wed,': 0.18; 'input': 0.22; 'otherwise,': 0.22; 'separate': 0.22; 'cc:addr:python.org': 0.22; 'space.': 0.24; 'cc:2**0': 0.24; 'cc:no real name:2**0': 0.24; 'header:In-Reply-To:1': 0.27; 'message-id:@mail.gmail.com': 0.30; 'usually': 0.31; 'indentation': 0.31; 'file': 0.32; 'this.': 0.32; 'another': 0.32; 'could': 0.34; 'received:google.com': 0.35; 'there': 0.35; 'subject:?': 0.36; 'two': 0.37; 'skip:o 20': 0.38; 'nov': 0.38; 'needed': 0.38; 'pm,': 0.38; 'bad': 0.39; 'how': 0.40; 'skip:c 50': 0.60; 'save': 0.62; 'temporary': 0.65; 'it!': 0.67; 'all;': 0.84; 'subject:long': 0.84; 'victor': 0.84; 'to:none': 0.92; '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:date:message-id:subject:from:cc :content-type; bh=fcKXjGz1diXfkBqpsSDlX8N6iqSxojSUZiTKSAv4YVw=; b=uAp6QkoPlXPtV4DrLfon8jmV0DhSCbbwVoO4zuDuiEqOMSEz/BZPFUVBFtI8lQk8r9 gPgJxp65z5r5WFv5GoP7pkf74KlLu4Jj59aOi0oUAgfW4GrdsjakIQJfQWszrDQnwKCm K6yxmSmaM26jRbv+TzwdcYt9x2oq72Oyuy3ixfMIzSBxFVvbm0QaajZvmv68KTrS+Qde MM0kgKH1xoORTcygY/4z25GoPRCNxFEX1O1NGGYbmEx3m9K7APqpvgPeKh+dY9cc8YQw EjE79g1faYJD1sEzhdkRk9TYNJjU8zseMxoxQD71yUabq+9Pnq+AQ8u8w9KY8DFrnxQy xo8A== MIME-Version: 1.0 X-Received: by 10.194.109.167 with SMTP id ht7mr34519929wjb.5.1385608193904; Wed, 27 Nov 2013 19:09:53 -0800 (PST) In-Reply-To: References: Date: Wed, 27 Nov 2013 22:09:53 -0500 Subject: Re: Python and PEP8 - Recommendations on breaking up long lines? From: Neil Cerutti Cc: python-list@python.org Content-Type: text/plain; charset=ISO-8859-1 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: 26 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1385608200 news.xs4all.nl 15939 [2001:888:2000:d::a6]:36081 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:60670 tOn Wed, Nov 27, 2013 at 8:57 PM, Victor Hooi wrote: > with open(self.full_path, 'r') as input, open(self.output_csv, 'ab') as output: There are two nice and clean solutions for this. I usually nest them. with open(self.full_path, 'r') as input: with open(self.ouptut_csv, 'ab') as output: I use a non-standard (shortened) indentation for nested with statements, to save space. I don't feel bad about this at all; the with statement's syntax makes me do it! Otherwise, contextlib.ExitStack is another way to separate them. with contextlib.ExitStack() as stack: input = stack.enter_context(open(self.full_path, 'r')) writer = csv.writer(stack.enter_context(open(self.output_csv))) When working with a csv file I like how it removes the output temporary file object variable, though if you needed it for some reason you could keep it. -- Neil Cerutti