How to fix ModuleNotFoundError: No module named 'lxml'

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

Verification

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