RPM is a package format used by Fedora, Red Hat and some other Linux distributions. So if you want to make your package available there, you need to know how to create RPMs.
Before Python 3 there was a bdist_rpm command, which had gone in packaging (Distutils2). If you're interested to know - ask Tarek (and don't forget to update the info here). Now there are two packages to help make .rpm out of Python package (setup.py?):