Test Driven Development template Virtual Environment setup First ensure that virtualenv is installed: pip3 install virtualenv To activate the virtual environment run: source venv/bin/activate then to deactivate: deactivate Links that help: https://towardsdatascience.com/virtual-environments-for-absolute-beginners-what-is-it-and-how-to-create-one-examples-a48da8982d4b https://testdriven.io/blog/modern-tdd/