Unable to configure -v|--version flags when version given to ArgumentParser about argparse HOT 5 CLOSED

If you don't like the default version argument, you should supply your own, 
e.g.:

>>> parser = argparse.ArgumentParser()
>>> parser.add_argument('-V', action='version')
>>> parser.version = 'foo 0.1'
>>> parser.add_argument('-v', '--verbose')
>>> parser.parse_args(['-V'])
foo 0.1

The only thing that's a little odd about this solution is that you can't 
specify the
version in the add_argument call. Ideally I think you'd write:

>>> parser.add_argument('-V', action='version', version='foo 0.1')

If this would meet your needs, I'll see about a patch. In the meantime, you can 
use
the above workaround.

Indeed, I am using:

>>> parser = argparse.ArgumentParser()
>>> parser.add_argument('-V', '--version', ...)
>>> parser.add_argument('-v', '--verbose', ...)
...

It wasn't immediately obvious to do:

>>> parser.add_argument('-V', action='version')
>>> parser.version = 'foo 0.1'

but that works quite well.  I don't think I need anything further, but you could
still consider a small change to code or documentation to make it obvious how to
configure version.

Thanks

Yep, if nothing else, I'll add some documentation.

Thinking about this a bit, I believe the right answer is definitely to modify
_VersionAction to take a version= argument so that this works:

>>> parser.add_argument('-V', action='version', version='foo 0.1')

I'm changing this ticket to a feature enhancement because I can't really 
justify that
change as a bugfix, but this is an easy feature to add, and I'll definitely 
include
it in the 1.1 release.

Added in r68. The following now works:

>>> parser = argparse.ArgumentParser(prog='PROG')
>>> parser.add_argument('-V', action='version', version='%(prog)s 2.0')
>>> parser.parse_args(['-V'])
PROG 2.0