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2013-03-08T12:35:33.113
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2013-03-11T18:07:46.507
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2013-03-11T18:07:46.507
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While the <code>argparse</code> answer was accepted, the original question was how to accomplish this with the simpler <code>argh</code> module. Here's how: <pre><code>from argh import * from show import show # only needed for demonstration purposes CMD_ALIASES = { 'dpd' : 'download-and-parse-data', 'dp' : 'download-and-parse-data', 'dd' : 'download-data', 'pd' : 'parse-data', } def choices_for(d): """ Return list of unique items (command aliases plus unabridged commands). Works in Python >= 2.5. NB In the degenerate case when an alias and an unabridged command are identical, the alias takes priority. (In my best Terminator voice: Don't do dat.) """ return sorted(set(d.keys()) | set(d.values())) @arg('cmd', choices=choices_for(CMD_ALIASES)) @arg('-r', '--randomize-order', default=False) @arg('-t', '--training-percent', default=0) def main(args): args.command = CMD_ALIASES.get(args.cmd, args.cmd) show(args, props=True) dispatch_command(main) </code></pre> This sets up a slightly generalized aliasing mechanism (one that allows multiple aliases for any given command). The resulting <code>args</code> object has both an <code>args.cmd</code> value for the command actually given, and a canonical <code>args.command</code> value that resolves the given alias, if any. For example: <pre><code>$ ./my_program.py dpd -r -t 80 args: cmd='dpd' command='download-and-parse-data' randomize_order=True training_percent=80 </code></pre> There is also another mechanism built into <code>argh</code> to do command aliases if you are dispatching commands to individual functions: the <code>@aliases</code> decorator, described <a href="http://argh.readthedocs.org/en/latest/reference.html" rel="nofollow">here</a>. NB this approach has a dependency on recent versions of <code>argparse</code>, so may not work in older Python distributions/environments.
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1. POAn easy way to set up abbreviations with argh
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1. USJonathan Eunice
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1. USJonathan Eunice
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