I prepare wheel for every package I use. When I prepared wheel package for pdbpp, and installed that wheel - it did not work, while when installing from sources worked fine.
$ (unset PIP_NO_INDEX; pip wheel pdbpp) $ pip install pdbpp
When I used
import pdb; pdb.set_trace() in the code, regular pdb was loaded.
When I installed pdbpp from sources, pdbpp will work fine.
I'm using wheel==0.24.0.