[gentoo-python] A virtual for argparse module

[Michał Górny]

Hi,

The argparse module is bundled with some Python implementations,
and some other require it being installed via dev-python/argparse. To
simplify handling that from ebuilds, I hereby suggest introducing
virtual/python-argparse -- a package based on PYTHON_TARGETS which
would simply install (or not) the actual argparse module as necessary.

I am attaching a simple implementation of that, using python-r1. It
simply requests (as a RDEP) the appropriate Python version (thus
requesting the module for implementations having it built-in)
and the dev-python/argparse package for the implementations missing it.

You can also note that the PYTHON_COMPAT misses pypy -- it's because I
simply have no idea whether they bundle it ;). Feel free to correct
that.

What are you thoughts?

-- 
Best regards,
Michał Górny