Create a Python virtual environment with `virtualenv`

venv.sh

#!/bin/sh
# Create a Python virtual environment with `virtualenv`
#
# Other options exist for creating and managing virtual environments, such as:
#   Conda: https://docs.conda.io/projects/conda/en/latest/user-guide/tasks/manage-environments.html
#   Pipenv: https://pipenv.pypa.io/en/latest/

virtualenv venv/ # Create virtual environment -- `venv` can be anything you'd like
source venv/bin/activate # Activate virtual environment in session (change `venv` according to your selection in above command)