Hi there! I've found that a lot of code use the both methods for indentation: tabs and spaces. Take a look at DITrack/DB.py for example. I use vim and "set tabstop=4", so all code become incorrect. Vlad, Oleg, your comments? What style do you prefer? My opinion: 4 spaces for one level of indentation, no tabs. Every file should be "retabed". Ivan.