How to fix ModuleNotFoundError: No module named 'threadpoolctl'

ModuleNotFoundError: No module named 'threadpoolctl'
Recommended: Install via pip into your active environment.
python -m pip install threadpoolctl

Verification

Command
python -c "import threadpoolctl; print(threadpoolctl.__version__)"
Expected output
Success! threadpoolctl version x.y.z (e.g., 2.4.0)