How to build debian package with CPack to execute setup.py?

Question

Until now, my project had only .cpp files that were compiled into different binaries and I managed to configure CPack to build a proper

Answer 1

A setup.py file is the equivalent of the configure && make && make install dance for a standard unix source distribution and as such is inappropriate to run as a part of a distributions package install process. See this discussion of the different ways to include Python modules in a .deb package.