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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.
Didn't know that one, thanks for the tip!
Please include info that function should return None for empty list
[mark for mark in marks] doesn't make sense, since it produces the list which exatle the same as marks.
List comprehensions are used when you want to create new list by changing the items of existing list in some way, not just by repeating them
Like it, simple, clean and clever