argparse -- mutually exclusive sets of arguments?

From	Roy Smith <roy@panix.com>
Newsgroups	comp.lang.python
Subject	argparse -- mutually exclusive sets of arguments?
Date	2012-11-23 13:46 -0500
Organization	PANIX Public Access Internet and UNIX, NYC
Message-ID	<roy-DDAE52.13462523112012@news.panix.com> (permalink)

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My command either takes two positional arguments (in which case, both 
are required):

$ command foo bar

or the name of a config file (in which case, the positional arguments 
are forbidden):

$ command --config file

How can I represent this with argparse; add_mutually_exclusive_group() 
isn't quite the right thing.  It could specify that foo and --config are 
mutually exclusive, but not (as far as I can see) the more complicated 
logic described above.

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Thread

argparse -- mutually exclusive sets of arguments? Roy Smith <roy@panix.com> - 2012-11-23 13:46 -0500
  Re: argparse -- mutually exclusive sets of arguments? Terry Reedy <tjreedy@udel.edu> - 2012-11-23 13:56 -0500
  Re: argparse -- mutually exclusive sets of arguments? Ian Kelly <ian.g.kelly@gmail.com> - 2012-11-23 18:07 -0700

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