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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.
The problem, in python language, is when you run code against second set of tests. In first assertions, method is called "countBits". In later tests, there is an error that solution cannot import count_bits. So, all you need to do is to rename function from countBits to count_bits, and everything will work. Altough, this should not be done manually, I think this should be fixed by the author.