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Thanks, and by the way, running it from any directory other than the project's root causes a FileNotFoundError. So more like:
$ cd subscript
$ python3 gui.py
Users of Ubuntu-based distros will need to install these packages:
python3-gi
gir1.2-gtksource-3.0
gir1.2-gtkspell3-3.0
gir1.2-clutter-1.0
You might want to include this info in the original post, because the package names that Ubuntu uses aren't quite obvious.