getting python version used by another port

[Titus von Boxberg]

Hi,

I'd like to fix
http://trac.macports.org/ticket/31943

Short outline:
Currently there is a port py26-hgsubversion.
However, mercurial has moved to python27.

The idea given in the ticket is to get the python version used by mercurial
instead of hardcoding it into the hgsubversion Portfile.
Is this somehow possible?

Or is it necessary to create py27-hgsubversion and have py26-hgsubversion
being replaced_by the former?

Regards
Titus