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    <p>Functionality akin to <a href="http://pypi.python.org/pypi/plac" rel="nofollow"><code>plac</code></a> is provided by <a href="http://pypi.python.org/pypi/argh" rel="nofollow">argh</a>, which particularly features simple creation of subparsers (like those found in <code>git</code> or <code>django-admin.py</code>).</p> <p>An example from its <a href="http://packages.python.org/argh" rel="nofollow">docs</a>:</p> <pre><code>from argh import * def dump(args): return db.find() @command def load(path, format='json'): print loaders[format].load(path) p = ArghParser() p.add_commands([load, dump]) if __name__ == '__main__': p.dispatch() </code></pre> <p>Produces the following <code>--help</code> response:</p> <pre><code>usage: prog.py [-h] {load,dump} ... positional arguments: {load,dump} load dump optional arguments: -h, --help show this help message and exit </code></pre> <p>and the following with <code>load --help</code>:</p> <pre><code>usage: prog.py load [-h] [-f FORMAT] path positional arguments: path optional arguments: -h, --help show this help message and exit -f FORMAT, --format FORMAT </code></pre> <p>Arguments may be annotated:</p> <pre><code>@arg('path') @arg('--format', choices=['yaml','json'], default='json') @arg('--dry-run', default=False) @arg('-v', '--verbosity', choices=range(0,3), default=1) def load(args, LOADERS={'json': json.load, 'yaml': yaml.load}): loader = loaders[args.format] data = loader(open(args.path)) ... </code></pre> <p>And with <code>@plain_signature</code>, the <code>args</code> argument to <code>load</code> is expanded into keyword arguments:</p> <pre><code>@arg('path') @arg('--format', choices=['yaml','json'], default='json') @arg('--dry-run', default=False) @arg('-v', '--verbosity', choices=range(0,3), default=1) @plain_signature def load(path, format, dry_run, verbosity): ... </code></pre>
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    1. PO(semi-) automatic generation of argparsers for functions
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    1. COThanks, that looks interesting. There's also a list of [similar projects](http://plac.googlecode.com/hg/doc/plac.html#plac-vs-the-rest-of-the-world) in plac docs.
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    2. COIt seems [`argh` also has such a list](http://packages.python.org/argh/#similar-projects) apparently... and it's longer :P
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    3. COArgh now also supports the "natural" syntax, i.e. you write plain Python functions and the rest is Argh's business.
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      1. USAndy Mikhaylenko
 

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