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    <p>The argparse module offers a way to do this without implementing your own requiredness checks. The example below uses "subparsers" or "sub commands". I've implemented a subparser for "dump" and one for "format".</p> <pre><code>import argparse parser = argparse.ArgumentParser() parser.add_argument('file', help='The file you want to act on.') subparsers = parser.add_subparsers(dest='subcommand') # subparser for dump parser_dump = subparsers.add_parser('dump') # add a required argument parser_dump.add_argument( 'format', choices=['csv', 'json'], help='Dump the file in this format.') # subparser for upload parser_upload = subparsers.add_parser('upload') # add a required argument parser_upload.add_argument( 'server', choices=['amazon', 'imgur'], help='Upload the file to this service.') args = parser.parse_args() print args if args.subcommand == 'dump': print 'I will now dump "%s" in the %s format' % (args.file, args.format) if args.subcommand == 'upload': print 'I will now upload "%s" to %s' % (args.file, args.server) </code></pre> <p>That looks like this on the command line:</p> <pre><code>$ python ap.py usage: ap.py [-h] file {upload,dump} ... ap.py: error: too few arguments $ python ap.py tmp.txt usage: ap.py [-h] file {upload,dump} ... ap.py: error: too few arguments $ python ap.py tmp.txt upload usage: ap.py file upload [-h] {amazon,imgur} ap.py file upload: error: too few arguments $ python ap.py tmp.txt upload amazo usage: ap.py file upload [-h] {amazon,imgur} ap.py file upload: error: argument server: invalid choice: 'amazo' (choose from 'amazon', 'imgur') $ python ap.py tmp.txt upload amazon Namespace(file='tmp.txt', server='amazon', subcommand='upload') I will now upload "tmp.txt" to amazon $ python ap.py tmp.txt upload imgur Namespace(file='tmp.txt', server='imgur', subcommand='upload') I will now upload "tmp.txt" to imgur $ python ap.py tmp.txt dump usage: ap.py file dump [-h] {csv,json} ap.py file dump: error: too few arguments $ python ap.py tmp.txt dump csv Namespace(file='tmp.txt', format='csv', subcommand='dump') I will now dump "tmp.txt" in the csv format $ python ap.py tmp.txt dump json Namespace(file='tmp.txt', format='json', subcommand='dump') I will now dump "tmp.txt" in the json format </code></pre> <p>More info: <a href="http://docs.python.org/dev/library/argparse.html#argparse.ArgumentParser.add_subparsers" rel="noreferrer">http://docs.python.org/dev/library/argparse.html#argparse.ArgumentParser.add_subparsers</a></p>
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    1. POConditional command line arguments in Python using argparse
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