According to the PyPI entry, this software supports Python 3 upstream.
Please provide a Python 3 package for Fedora.
I can see Python 3 support is in the spec file, but disabled
(%global with_python3 0) without any comment.
According to the Python packaging guidelines , 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 .
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
It's ok to do this in Rawhide only, however, it would be greatly
appreciated if you could push it to Fedora 24 as well.
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!
At the time of the review, dependencies like oslo libs were not python3 enabled, hence it was disabled.
We can push python3 enabled build in rawhide but for F24, it has to wait for https://bodhi.fedoraproject.org/updates/FEDORA-2016-af98a85b1f to reach stable (or be added to the bundle)
Can the python3 build be enabled at the moment?
Also as I see the binary is present in both python2 and python3 subpackage's file section. This will drag an extra dependency. Binaries should go to the python 3 subpackage as described here 
Also you could create if you want the binary for both the subpackages with a procedure described here 
OpenStack has not yet migrated to python3 and it won't before a long time so default version should be python2.
Reassigning to myself, I'll fix it
Fixed in rawhide, note that congressclient does not provide CLI anymore.