How to fix ModuleNotFoundError: No module named 'blinker'

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

Verification

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