To get that fast you need to write around 1 line of code per 3 seconds with zero bugs. It might seem impossible but if you train with it as a goal you will even

To get that fast you need to write around 1 line of code per 3 seconds with zero bugs. It might seem impossible but if you train with it as a goal you will eventually reach it. It is true though that people use libraries and such, but no library would save any time on this problem and prebuilding the print "Case X:" wouldn't save much more than a few seconds.