Using Virtual Environments with Lambda Stack

@sabalaba Thank you. If we use the 2nd option:
virtualenv --system-site-packages -p python3 your_venv
and then install additional packages from an additional requiremnts.txt file
would the additional packages be installed in the venv, or where system site packages are installed?

I have a lambda-labs tensor book.
We want to use Data Science cookie cutter for our project: Home - Cookiecutter Data Science which suggests, as a best practice, to have a separate python venv for each project.