Check we have it installed with:
$ python3 --version
Python 3.8.5# jump in to this directory
cd python
# create a venv directory if it doesn't exist
python3 -m venv venv
# activate the virtual environment
source venv/bin/activate
# install the dependencies
pip install -r requirements.txt
# run the tests
pytest index_test.py
# watch the tests:
watchmedo shell-command --patterns='*.py' --command='pytest index_test.py'
# when finished, we deactivate our virtual environment
deactivate