Hi, as was discussed on python-devel [1], I'd like to propose this change to Python guidelines section for executables in connection with Python 2 vs Python 3 stacks. (Please note that this is originally Toshio's proposal, so the credit goes to him; I'm just opening this ticket):

• https://fedoraproject.org/wiki/Packaging:Python#Guidelines : Currently
  reads:

If the executables provide the same functionality independent of whether
they are run on top of Python 2 or Python 3, then only one version of the
executable should be packaged. Currently it will be the python
2 implementation, but once the Python 3 implementation is proven to work,
the executable can be retired from the python 2 build and enabled in the
python 3 package. Be sure to test the new implementation. Transitioning from
python2 to python3 is left to individual package maintainers except for
packages in Fedora's critical path. For these, we want to port to python3
versions in the same Fedora release if possible.

Change that to:

If the executables provide the same functionality independent of whether
they are run on top of Python 2 or Python 3, then only one version of the
executable should be packaged. In F22 and later, this should be the Python 3
version. In F21 and earlier this is left to the individual package
maintainers '''except''' for packages in Fedora's critical path. Those should
remain on the Python 2 version so that we don't drag in both python2 and
python3 stacks on a minimal system.

[1] https://lists.fedoraproject.org/pipermail/python-devel/2013-November/000528.html