https://pypi.org/project/pybase64/ aka https://github.com/mayeut/pybase64 (BSD licensed) exists. On top of some of its own SIMD code for base64 module extra features ...
Getting root access can allow you to read the flag. Luckily there is a python file that you might like to play with. Through Social engineering, we've got the credentials to use on the server. SSH is ...