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2013-08-02T21:29:40.997
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2013-08-02T21:29:40.997
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<p>I think it is pretty hard to achieve that (including a nice help message) while only using the standard argparse functions. You can however easily test it yourself after parsing the arguments. You can describe the extra requirements in the epilogue or so. Note that it is unusual to use numbers as options, I had to use dest='two', since args.2 is not valid syntax.</p> <pre><code>#!/usr/bin/env python import argparse parser = argparse.ArgumentParser( description='bla bla', epilog='Note: arguments -3 and -4 are required when -2 is missing') parser.add_argument('-2', dest='two', action='store_true') parser.add_argument('-3', dest='three') parser.add_argument('-4', dest='four') parser.add_argument('-5', dest='five') args = parser.parse_args() if not args.two and (args.three is None or args.four is None): parser.error('arguments -3 and -4 are required when -2 is missing') print 'Good:', args </code></pre> <p>With these results:</p> <pre><code>[~]: ./test.py -h usage: test.py [-h] [-2] [-3 THREE] [-4 FOUR] [-5 FIVE] bla bla optional arguments: -h, --help show this help message and exit -2 -3 THREE -4 FOUR -5 FIVE Note: arguments -3 and -4 are required when -2 is missing [~]: ./test.py -2 Good: Namespace(five=None, four=None, three=None, two=True) [~]: ./test.py -3 a -4 b Good: Namespace(five=None, four='b', three='a', two=False) [~]: ./test.py -3 a usage: test.py [-h] [-2] [-3 THREE] [-4 FOUR] [-5 FIVE] test.py: error: arguments -3 and -4 are required when -2 is missing [~]: ./test.py -2 -5 c Good: Namespace(five='c', four=None, three=None, two=True) [~]: ./test.py -2 -3 a Good: Namespace(five=None, four=None, three='a', two=True) </code></pre>
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1. POPython argparse conditional requirements
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1. USBas Swinckels
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1. COWhile `args.2` does not work, `getattr(args,'2')` does. Arguments like `-2` are allowed, but add unnecessary complications.
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