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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.
He only trained in Python (the error message is different tho), but that's part of random tests, read this
"test 5" is not very helpful. Just state what the input was.
The log message '5 must be 2' probably means you returned
5
but should have returned2
but I don't know which language this is.