How to fix ModuleNotFoundError: No module named 'psutil'

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

Verification

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