Re: newbie question about subprocess.Popen() arguments

Path	csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!xlned.com!feeder3.xlned.com!newsfeed.xs4all.nl!newsfeed4.news.xs4all.nl!xs4all!post.news.xs4all.nl!not-for-mail
Return-Path	<python-python-list@m.gmane.org>
X-Original-To	python-list@python.org
Delivered-To	python-list@mail.python.org
X-Spam-Status	OK 0.000
X-Spam-Evidence	'H': 1.00; 'S': 0.00; 'operator': 0.03; 'subject:skip:s 10': 0.07; 'feature,': 0.09; 'msg': 0.09; 'parameter': 0.09; 'received:80.91': 0.09; 'received:80.91.229': 0.09; 'received:gmane.org': 0.09; 'received:list': 0.09; 'spaces': 0.09; 'subject:question': 0.10; 'accepts': 0.16; 'argument,': 0.16; 'received:80.91.229.3': 0.16; 'received:dip0.t-ipconnect.de': 0.16; 'received:plane.gmane.org': 0.16; 'received:t-ipconnect.de': 0.16; 'slash': 0.16; 'stdout': 0.16; 'symbols': 0.16; 'wrote:': 0.18; 'trying': 0.19; 'alex': 0.19; 'import': 0.22; 'shell': 0.22; 'print': 0.22; 'header:User- Agent:1': 0.23; 'question': 0.24; 'header:X-Complaints-To:1': 0.27; "i'm": 0.30; 'that.': 0.31; 'parameters.': 0.31; 'file': 0.32; 'problem': 0.35; 'but': 0.35; 'method': 0.36; 'to:addr :python-list': 0.38; 'to:addr:python.org': 0.39; 'received:org': 0.40; 'how': 0.40; 'new': 0.61; 'save': 0.62; 'name': 0.63; 'different': 0.65; 'p.s.': 0.66
X-Injected-Via-Gmane	http://gmane.org/
To	python-list@python.org
From	Peter Otten <__peter__@web.de>
Subject	Re: newbie question about subprocess.Popen() arguments
Date	Thu, 23 May 2013 09:32:40 +0200
Organization	None
References	<CABPy6+wGwvkyrq06k87hZfDO2-bNxsw72RNKyDq9hng_QwNPVw@mail.gmail.com>
Mime-Version	1.0
Content-Type	text/plain; charset="ISO-8859-1"
Content-Transfer-Encoding	7Bit
X-Gmane-NNTP-Posting-Host	p5084aeca.dip0.t-ipconnect.de
User-Agent	KNode/4.7.3
X-BeenThere	python-list@python.org
X-Mailman-Version	2.1.15
Precedence	list
List-Id	General discussion list for the Python programming language <python-list.python.org>
List-Unsubscribe	<http://mail.python.org/mailman/options/python-list>, <mailto:python-list-request@python.org?subject=unsubscribe>
List-Archive	<http://mail.python.org/pipermail/python-list/>
List-Post	<mailto:python-list@python.org>
List-Help	<mailto:python-list-request@python.org?subject=help>
List-Subscribe	<http://mail.python.org/mailman/listinfo/python-list>, <mailto:python-list-request@python.org?subject=subscribe>
Newsgroups	comp.lang.python
Message-ID	<mailman.2000.1369294348.3114.python-list@python.org> (permalink)
Lines	25
NNTP-Posting-Host	2001:888:2000:d::a6
X-Trace	1369294348 news.xs4all.nl 15973 [2001:888:2000:d::a6]:60959
X-Complaints-To	abuse@xs4all.nl
Xref	csiph.com comp.lang.python:45783

Show key headers only | View raw

Alex Naumov wrote:

> I'm trying to call new process with some parameters. The problem is that
> the last parameter is a "string" that has a lot of spaces and different
> symbols like slash and so on. I can save it in file and use name of this
> file as parameter, but my question is: how to make it without   additional
> saving?
> 
> import subprocess as sp
> 
> rc = sp.Popen(["prog", "--options", "<", msg], stdin=sp.PIPE,
> stdout=sp.PIPE)
> stdout = rc.communicate()[0]
> print stdout

> p.s.
> type(msg) => <type 'str'>

The < operator is a shell feature, not an argument, and msg is intended to 
be send to prog's stdin. The communicate() method accepts a parameter for 
that. So:

rc = sp.Popen(["prog", "--options"], stdin=sp.PIPE, stdout=sp.PIPE)
stdout = rc.communicate(msg)[0]

Back to comp.lang.python | Previous | Next | Find similar | Unroll thread

Thread

Re: newbie question about subprocess.Popen() arguments Peter Otten <__peter__@web.de> - 2013-05-23 09:32 +0200

csiph-web