How to fix ModuleNotFoundError: No module named 'pytz'

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

Verification

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