Comment 2 for bug 2000793

I checked the PyQt5 documentation and the import sip will fail if no PyQt5 imports are performed before it.

https://www.riverbankcomputing.com/static/Docs/PyQt5/incompatibilities.html#pyqt-v5-11

Have adjusted imports accordingly. Just running tests to see if removing the setapi() call is OK (I note that setapi() has been deprecated).