Logging

[stefan-voelk]

Python offers logging capability via the logging package. I understand that this package is flexible since different logging levels can be defined (INFO, DEBUG, WARNING, ERROR, CRITICAL) and the logging messages can be channeled to different outputs (stdout, file). However, the difference between raising an exception, logging and printing sometimes is not obvious. I think it needs a discussion when to use logging and when not, and possibly refactoring our code.
A first guideline when to use logging is this tutorial.