[Python-Dev] PEP 389: argparse - new command line parsing module

Andrew McNabb amcnabb at mcnabbs.org
Thu Oct 1 00:58:00 CEST 2009

On Wed, Sep 30, 2009 at 02:40:20PM -0700, Steven Bethard wrote:
> > Also, is it possible to add these subparsers dynamically?  For example,
> > you would want to be able to load a module immediately after parsing the
> > name instead of having to keep a predetermined list of all module names.
> > I'm pretty sure that bzr dynamically loads modules this way.  Can
> > argparse help with this?
> You can probably already do this. I'm not 100% sure what you want to
> do, but it's certainly possible to define an argparse.Action that
> loads a module when it's invoked. It might look something like::
>     class MyAction(argparse.Action):
>         def __call__(self, parser, namespace, value, option_string=None):
>             mod = __import__(value) # or whatever

This looks much easier than what I was able to do in optparse.  Cool.

Andrew McNabb
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