title: An easy way to set up abbreviations with argh
body: <p>I'm using the argh library to create a python command line tool.  Several of the names I'm using have turned out to be pretty long, e.g.:</p>
  
  <pre><code>./my_program.py download-and-parse-data --randomize-order --training-percent 80
  </code></pre>
  
  <p>Is there a simple way to allow abbreviations?  For example, here's a potential abbreviated version of the above line.</p>
  
  <pre><code>./my_program.py dpd -r -t 80
  </code></pre>
  
  <p>Ideally, I'd like to be able to use <em>both</em> command-line forms -- the long, informative version, as well as the short, easy-to-type version.  Is there a good way to do this?</p>