unified python portgroup and different versions for different python versions

[Adam Mercer]

Hi

There are a couple of ports I'd like to transition over to the
python-1.0 portgroup but the complication is that different versions
are required for different python versions. For example, one port
requires version 1.x for python2 and version 2.x for python3. Is there
a way to achieve this using the unified python portgroup?

Cheers

Adam