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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
You don't need "and len(n)". ;-)
Seriously, /? Is this Python2? :-o
Guido hates the return type being dependent on argument values. That's why even 8/2 is 4.0 in sane Pythons, not 4. Although, of course, there is an exception. Can you tell what it is? :-]
Python3 - great! Now can you please enable it for all katas that specify Python2? :-)