System and JupyterHub server Python versions

There are two versions of Python available on the command line ("system" Python) on BRCF compute servers. In Ubuntu 20.04, these versions and the command to invoke them are:

• 2.7 - python, python2
• 3.8 - python3, python3.8

(Note that the 3.x python version on Ubuntu 18.04 was 3.6.)

There are corresponding versions of pip that should be used to install 3rd party packages:

• for Python 2 - pip, pip2
• for Python 3 - pip3

Understanding Python add-on packages

Troubleshooting other JupyterHub server issues