On Wed Jun 2 21:08:47 BST 2021, Rich Shepard wrote: > Running python3-PyQt5-5.13.2-x86_64-2_SBo and python3-3.7.2-x86_64-1_SBo on > Slackware-14.2/x86_64. [...] > For some reason it's not importing the PyQt5 modules: > $ python -mpdb datasource.py Could it be that you need to run Python 3 explicitly? python3 -mpdb datasource.py Just an idea. David