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    <p><strong>This answer suggests <code>optparse</code> which is appropriate for older Python versions. For Python 2.7 and above, <code>argparse</code> replaces <code>optparse</code>. See <a href="https://stackoverflow.com/questions/3217673/why-use-argparse-rather-than-optparse">this answer</a> for more information.</strong></p> <p>As other people pointed out, you are better off going with optparse over getopt. getopt is pretty much a one-to-one mapping of the standard getopt(3) C library functions, and not very easy to use.</p> <p>optparse, while being a bit more verbose, is much better structured and simpler to extend later on.</p> <p>Here's a typical line to add an option to your parser:</p> <pre><code>parser.add_option('-q', '--query', action="store", dest="query", help="query string", default="spam") </code></pre> <p>It pretty much speaks for itself; at processing time, it will accept -q or --query as options, store the argument in an attribute called query and has a default value if you don't specify it. It is also self-documenting in that you declare the help argument (which will be used when run with -h/--help) right there with the option.</p> <p>Usually you parse your arguments with:</p> <pre><code>options, args = parser.parse_args() </code></pre> <p>This will, by default, parse the standard arguments passed to the script (sys.argv[1:])</p> <p>options.query will then be set to the value you passed to the script.</p> <p>You create a parser simply by doing</p> <pre><code>parser = optparse.OptionParser() </code></pre> <p>These are all the basics you need. Here's a complete Python script that shows this:</p> <pre><code>import optparse parser = optparse.OptionParser() parser.add_option('-q', '--query', action="store", dest="query", help="query string", default="spam") options, args = parser.parse_args() print 'Query string:', options.query </code></pre> <p>5 lines of python that show you the basics.</p> <p>Save it in sample.py, and run it once with</p> <pre><code>python sample.py </code></pre> <p>and once with</p> <pre><code>python sample.py --query myquery </code></pre> <p>Beyond that, you will find that optparse is very easy to extend. In one of my projects, I created a Command class which allows you to nest subcommands in a command tree easily. It uses optparse heavily to chain commands together. It's not something I can easily explain in a few lines, but feel free to <a href="https://thomas.apestaart.org/moap/trac/browser/trunk/moap/extern/command/command.py" rel="noreferrer">browse around in my repository</a> for the main class, as well as <a href="https://thomas.apestaart.org/moap/trac/browser/trunk/moap/command/doap.py" rel="noreferrer">a class that uses it and the option parser</a></p>
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    1. POWhat's the best way to parse command line arguments?
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    1. USThomas Vander Stichele
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    1. CO@Silfheed's suggestion of argparse seems even better. code.google.com/p/argparse
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    2. COThis answer is wonderfully clear and easy to follow -- for python 2.3 thru 2.6. For python 2.7+ it is not the best answer as argparse is now part of the standard library and optparse deprecrated.
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      1. USmatt wilkie
 

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