Hi, we would like to use Python 3 on the default installation instead of Python 2 on Fedora 22.
From that perspective, your package is considered as IMPORTANT - that means, is has to be updated to Python 3, for our intention come true.
The goal here is, that this package uses Python 3 as default in Fedora 22. For that, you'll also need to use dnf instead of yum.
Please, help use update to Python 3 flawlessly.
Check if upstream already support Python 3, if yes, use it and add te support to the package.
If upstream doesn't support Python 3 yet, encourage it to do so by sending patches and offering your help.
When upstream is dead or unwilling to support Python 3, you'll need to patch this package on Fedora level. Try to avoid this as much as you can, but use it, if it's the last option.
Chances are, that you ARE the upstream. In that case, everything is easier, just do it yourself.
Once Python 3 is supported, check your package, if it works with it. Don't switch to Python 3 yet as a default (that's still against the guidelines). I recommend to prepare your spec and conditionalize the thing with something like %global default_python 2/3.
There is a table on wiki, that should list your package. Chances are, that you can see an upstream link that covers the problem. Anyway, please update the table with information you know.
I offer my help with this task, so if you have no idea, how to work on this, or it is just not your priority, don't hesitate to ask for help.
(As you've already realized, this is a bulk text, so if something is not quite exact about your package, sorry for that, just ask)
Note: do not follow this portion of the advice as it is against the Packaging Guidelines: "When upstream is dead or unwilling to support Python 3, you'll need to patch this package on Fedora level. Try to avoid this as much as you can, but use it, if it's the last option."
If you are in this situation, you'll essentially be forking upstream in order to produce a python3 port. In that situation, the proper thing to do is to create a new package with the python3 port. It would be even better to create the proper upstream infrastructure as well (new upstream scm and issue tracker) but that isn't 100% required by the guidelines.