These are all mananged as their own virtual env / requirements.txt
cd utils/foo python3 -m pip --version Should say something nice, else you need to (python3 -m pip install --user --upgrade pip)
python3 -m pip install --user virtualenv This is needed once, and then we should be able to make more envs like so:
python3 -m venv env This makes an env for
CWD. If we have several sub-projects in one checkout, we would cd into each and make an env in each. This makes directory utils/foo/env. This should be git-ignored. echo env >> .gitignore
source env/bin/activate This turns on our install, for this shell. (deactivate) to leave, or just close the shell.