PBR is a library that injects some useful and sensible default behaviors into your setuptools run.

PBR is only mildly configurable. The basic idea is that there's a decent way to run things and if
you do, you should reap the rewards, because then it's simple and repeatable. If you want to do
things differently, cool! But you've already got the power of python at your fingertips, so you
don't really need PBR.
