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copied!<p><a href="http://www.caliban.org/bash/#completion" rel="nofollow noreferrer">Bash "completion"</a> really is great. And easy for programs written in Python....</p> <p>I think this is just what you want: <a href="http://furius.ca/optcomplete/" rel="nofollow noreferrer">optcomplete: Shell Completion Self-Generator for Python</a>. It is available, e.g., as the "python-optcomplete" package in Ubuntu.</p> <p>You insert a few lines in your python program, and the user (one time) runs the bash "complete" program to tell bash how to complete the arguments:</p> <pre><code>complete -F _optcomplete <program> </code></pre> <p>and now the user has completion! By default it gives simple completion on program options. See the example for how to customize how completion works for a particular option. It is beautifully written, and easy to extend to handle sub-commands, alternate completion options, etc.!</p> <p><strong>Update:</strong></p> <p>For completion in zsh (for both optparse and argparse) see <a href="http://pypi.python.org/pypi/genzshcomp" rel="nofollow noreferrer">genzshcomp 0.3.1 : Python Package Index</a></p> <p>As noted by @englebip, we still need something similar for the new <code>argparse</code> module, introduced in Python 2.7 and 3.2, since <code>optparse</code> is now deprecated.</p> <p>Here is the discussion on moving in that direction:</p> <ul> <li><a href="http://www.gossamer-threads.com/lists/python/bugs/969495?do=post_view_threaded" rel="nofollow noreferrer">Mailing List Archive: [issue14103] argparse: add ability to create a bash_completion script</a></li> <li><a href="http://code.google.com/p/argparse/issues/detail?id=55" rel="nofollow noreferrer">Issue 55 - argparse - add a utilities for shell autocompleters to hook into as well as support for extending completion info - Python command line parsing - Google Project Hosting</a></li> </ul> <p>See also this background on how it is done: <a href="https://stackoverflow.com/questions/9568611/how-does-argparse-and-the-deprecated-optparse-respond-to-tab-keypress-after">How does argparse (and the deprecated optparse) respond to 'tab' keypress after python program name, in bash? - Stack Overflow</a></p>

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