From Fedora Project Wiki
A python 3 stack was added to Fedora in Fedora 13, parallel-installable with the "main" Python 2 stack, and it is gradually growing additional RPMs, as more code is ported to Python 3.
Note that /usr/bin/python is still Python 2.
Porting status
The porting status is tracked at http://portingdb-encukou.rhcloud.com/.
To submit changes or new notes to that app, see the source at https://github.com/fedora-python/portingdb/