I have never really understood Quantopian logging API and I wonder if I missed something. What are they useful for? Other than using different colours for different log types I can't see why they are there. If you don't care about the colours you can use classic print function.
The logging API might have been very useful if only the backtest page had allowed for log type filtering, but this feature has never been implemented. So why having logging API? Has anybody found those useful?