Upstream, this software supports Python 3. Please provide a Python 3 package for Fedora. According to the Python packaging guidelines [0], software must be packaged for Python 3 if upstream supports it. The guidelines give detailed information on how to do this, and even provide an example spec file [1]. The current best practice is to provide subpackages for the two Python versions (called "Common SRPM" in the guidelines). Alternatively, if nothing depends on your Python2 package, you can just switch to Python 3 entirely. It's fine to do this in Rawhide only. If anything is unclear, or if you need any kind of assistance with the porting, you can ask on IRC (#fedora-python on Freenode), or reply here. We'll be happy to help! [0] https://fedoraproject.org/wiki/Packaging:Python [1] https://fedoraproject.org/wiki/Packaging:Python#Example_common_spec_file
Ported over to python3 in rawhide: http://pkgs.fedoraproject.org/cgit/rpms/python-modernize.git/commit/?id=6dbec776d057f8c1fc8fe5731723bb2f78c2fab6