Path: csiph.com!usenet.pasdenom.info!gegeweb.org!de-l.enfer-du-nord.net!feeder2.enfer-du-nord.net!feeds.phibee-telecom.net!newsfeed.xs4all.nl!newsfeed2.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 0.006 X-Spam-Evidence: '*H*': 0.99; '*S*': 0.00; 'args': 0.04; '21,': 0.07; 'arg,': 0.09; 'arguments,': 0.09; 'subject:script': 0.09; 'subject:Help': 0.10; "wouldn't": 0.11; 'options.': 0.15; '-- help': 0.16; 'argparse': 0.16; 'from:addr:rosuav': 0.16; 'from:name:chris angelico': 0.16; 'subject:argparse': 0.16; 'wrote:': 0.17; 'thu,': 0.17; 'feb': 0.19; 'bit': 0.21; "i'd": 0.22; 'second': 0.24; 'script': 0.24; 'header:In-Reply-To:1': 0.25; 'message-id:@mail.gmail.com': 0.27; 'kumar': 0.29; 'things,': 0.29; 'keyword': 0.30; 'expect': 0.31; 'running': 0.32; 'goes': 0.33; 'strict': 0.33; 'to:addr:python-list': 0.33; 'received:google.com': 0.34; 'done': 0.34; 'whatever': 0.35; 'pm,': 0.35; 'received:209.85': 0.35; 'but': 0.36; 'subject:with': 0.36; 'skip:p 20': 0.36; 'received:209': 0.37; 'subject:: ': 0.38; 'there,': 0.38; 'to:addr:python.org': 0.39; 'your': 0.60; "you've": 0.61; "you'll": 0.62; 'provide': 0.62; 'become': 0.65; 'subject:this': 0.84; '2013': 0.84; "it'd": 0.84 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:content-type; bh=fvxk/e9EWkU3zDjGgf5kalfQ9vsRbR2Zi0b1XLV/9zQ=; b=mw/hQwC93Sr44TO3JkjSAAzx+Ols75BPcZS7xOU59wykqqAHpSXMcotdVapvhh2vsW +GYjo4ogWYKDOsgMboo12wDM+x/i+C8Ynds293jQNuw/NvAEIGBEVjxiSF1/ODJ1Dkto Kzihk808axxfLbzoxdVuhso3g/lQpuDWvzAZj6b/k3XURtsM9Cut1W9wb7sxAZDLa5CE RxvyrhN6dvjD6K9v3Qt+70N4f2IwHq7Z2mwEUR5zpz/NF1YnaxblZhzGtW8Sgq/zoa3e u2lXiZ1eFBaJQA4YyXSa3AtzxOJdE9hd+d6upk+xcyGEH6x41bTKA3UqoMN2Wya10EB+ LXSw== MIME-Version: 1.0 X-Received: by 10.52.67.164 with SMTP id o4mr26088225vdt.42.1361441617267; Thu, 21 Feb 2013 02:13:37 -0800 (PST) In-Reply-To: References: Date: Thu, 21 Feb 2013 21:13:37 +1100 Subject: Re: Help me debug this script with argparse and if statements From: Chris Angelico To: 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: 1361441619 news.xs4all.nl 6842 [2001:888:2000:d::a6]:55896 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:39411 On Thu, Feb 21, 2013 at 9:05 PM, Santosh Kumar wrote: > parser.add_argument( > 'install', > nargs='?', > help='install myapp' > ) > > parser.add_argument( > 'uninstall', > nargs='?', > help='uninstall myapp' > ) > > args = parser.parse_args() What you've done is make your program expect arguments, not options. Try running your script --help and you'll see how it parses. Whatever keyword is given goes into args.install, and if you provide a second arg, it'll become args.uninstall. To do what you're looking for there, I wouldn't bother with argparse at all - I'd just look at sys.argv[1] for the word you're looking for. Yes, it'd be a bit strict and simplistic, but by the look of things, you don't need sophistication. ChrisA