[Python] Importing modules from specific folder in Blender python script (MacOS)

In a script within a .blend file, I'm trying to import modules from a folder relative to that blend file.

This is my folder structure:

Models/

• model.blend
• _scripts/
  • color-thief-py-master/
    • colorthief.py
  • ...other python module repositories here

​

model.blend has this code at the top of one of its scripts:

from os.path import dirname as up

packages_path = os.path.join(up(bpy.data.filepath), "_scripts")

if (not packages_path in sys.path):
sys.path.insert(0, packages_path)


When I try to import colorthief afterwards (from colorthief import ColorThief) I get a ModuleNotFoundError. Same goes for all other modules in the scripts/ folder.

I have checked that the _scripts folder is being successfully added to the path.

What am I doing wrong here? I'm on MacOS but ideally looking for a cross-platform solution.

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