When setup.py is run in Ubuntu 16.04, the created .so names do not look like i.E. 'QtCore.so'. Instead, they have names like 'QtCore.cpython-35dm-x86_64-linux-gnu.so'.
The easy work-around is a rename script, as I have implemented in 'tqtc-coin-ci/src/modules.py'. But this bug should be fairly easy to fix it in pyside-setup.