You can create a virtual environment that you don't source/activate (for your projects), then you can use that to `pip install` the libraries you want to share and add that to your `PYTHONPATH`.

Since your `PYTHONPATH` searches in order your project virtual environment will override any other libraries you have in your path, say with different version.

It will look something like this:

    PYTHONPATH=${PWD}:${HOME}/envs/shared/lib64/${PYTHONVERSION}/site-packages/