Path: csiph.com!usenet.pasdenom.info!weretis.net!feeder1.news.weretis.net!feeder.erje.net!eu.feeder.erje.net!newsfeed.xs4all.nl!newsfeed5.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 0.002 X-Spam-Evidence: '*H*': 1.00; '*S*': 0.00; 'deprecated': 0.07; 'line:': 0.07; 'scripts': 0.09; 'python': 0.09; 'indicates': 0.09; 'porting': 0.09; 'stderr': 0.09; 'tuple': 0.09; 'suggest': 0.11; 'from:addr:mrabarnett.plus.com': 0.16; 'from:addr:python': 0.16; 'from:name:mrab': 0.16; 'message-id:@mrabarnett.plus.com': 0.16; 'module:': 0.16; 'stdout:': 0.16; 'subprocess': 0.16; 'wrote:': 0.17; 'shell': 0.18; 'trying': 0.21; 'parse': 0.22; 'this:': 0.23; 'command': 0.24; 'header:In-Reply-To:1': 0.25; 'header:User- Agent:1': 0.26; '[1]': 0.27; 'member.': 0.27; 'piece': 0.29; 'received:192.168.1.3': 0.29; "i'm": 0.29; 'code': 0.31; 'gets': 0.32; 'anybody': 0.32; 'skip:s 30': 0.33; 'subject:change': 0.33; 'to:addr:python-list': 0.33; 'hi,': 0.33; 'should': 0.36; 'does': 0.37; 'subject:: ': 0.38; 'some': 0.38; 'to:addr:python.org': 0.39; 'received:192': 0.39; 'received:192.168': 0.40; 'here': 0.65; 'header:Reply-To:1': 0.68; 'reply-to:no real name:2**0': 0.72; 'case?': 0.84; 'explanation:': 0.84; 'reply- to:addr:python.org': 0.84 X-CM-Score: 0.00 X-CNFS-Analysis: v=2.0 cv=XYELPfF5 c=1 sm=1 a=0nF1XD0wxitMEM03M9B4ZQ==:17 a=b2nRVtXOy8EA:10 a=FMschXuvAVwA:10 a=ihvODaAuJD4A:10 a=OUOv7kDek9cA:10 a=8nJEP1OIZ-IA:10 a=EBOSESyhAAAA:8 a=8AHkEIZyAAAA:8 a=CNm48DRdZ8IA:10 a=gkR-cCeKDPAR8O4OecQA:9 a=wPNLvfGTeEIA:10 a=0nF1XD0wxitMEM03M9B4ZQ==:117 X-AUTH: mrabarnett:2500 Date: Sat, 27 Oct 2012 04:02:06 +0100 From: MRAB User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:16.0) Gecko/20121010 Thunderbird/16.0.1 MIME-Version: 1.0 To: python-list@python.org Subject: Re: how to change os.popen4 to subprocess References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.15 Precedence: list Reply-To: python-list@python.org 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: 31 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1351306928 news.xs4all.nl 6844 [2001:888:2000:d::a6]:48073 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:32262 On 2012-10-27 03:28, skyworld wrote: > Hi, > > I'm new to python and I'm trying to porting some scripts from v0.96 to > v2.0.1. A piece of code is like this: > > cmd_h = os.popen4(env['SYSCMDLINE'])[1] > > the system indicates the popen4 is deprecated and suggest to use > subprocess. Can anybody tell me how to use subprocess in this case? > and what does "[1]" here means? > os.popen4 returns a tuple of (child_stdin, child_stdout_and_stderr). The [1] gets the child_stdout_and_stderr member. Using the subprocess module: # Untested! cmd_h = subprocess.Popen(env['SYSCMDLINE'], stdout=subprocess.PIPE, stderr=subprocess.STDOUT, shell=True).stdout Explanation: The command line: env['SYSCMDLINE'] Return stdout: stdout=subprocess.PIPE stderr should be combined with stdout: stderr=subprocess.STDOUT Let the shell parse the command line: shell=True