Nevermind, I solved it:
src/
main.py
mod/
__init__.py
components/
__init__.py
expander.py
language_id.py
utilities/
__init__.py
functions.py
main.py then refers to the subpackages as:
from mod.components.expander import *
from mod.utilities.functions import *
expander.py and language_id.py have access to functions.py with:
from ..utilities.functions import *
But the interesting thing is that I had a text file inside the components directory that expander.py uses. However, at runtime it couldn’t locate the file even though it was in the same directory. I moved the text file to the same directory as main.py and it worked. Seems counter-intuitive.