[ANN] argparse 0.2 - Command-line parsing library

Steven Bethard steven.bethard at gmail.com
Tue Oct 24 01:36:48 CEST 2006

Announcing argparse 0.2

argparse home:

argparse single module download:

argparse bundled downloads at PyPI:

About this release

This release fixes a few minor bugs, modifies the 'store_true' and
'store_false' actions to have more natural defaults, and adds an
epilog= keyword argument to ArgumentParser for text to be printed
after the help messages. (The latter is in line with the `updates to
optparse`_ for Python 2.5.)

.. _updates to optparse: http://www.python.org/doc/2.5/whatsnew/modules.html

New in this release

* The 'store_true' action's default is now False (instead of None).
* The 'store_false' action's default is now True (instead of None).
* ArgumentParser objects now accept an epilog= keyword argument.

About argparse

The argparse module is an optparse-inspired command line parser that
improves on optparse by:

* handling both optional and positional arguments
* supporting parsers that dispatch to sub-parsers
* producing more informative usage messages
* supporting actions that consume any number of command-line args
* allowing types and actions to be specified with simple callables
instead of hacking class attributes like STORE_ACTIONS or

as well as including a number of other more minor improvements on the
optparse API. To whet your appetite, here's a simple program that sums
its command-line arguments and writes them to a file::

   parser = argparse.ArgumentParser()
   parser.add_argument('integers', type=int, nargs='+')
   parser.add_argument('--log', type='outfile', default=sys.stdout)
   args = parser.parse_args()
   args.log.write('%s\n' % sum(args.integers))

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