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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.
(I thought I already fixed that... :s )
your problems comes from that part:
u=[1]. You felt into pyhton's mutable default argument trap. if you test 2 calls to your function locally, you'll see it doesn't output the correct numbers anymore the second time."My solution doesn't work for some reason" is not an issue.