Loading collection data...
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.
ok it's been corrected.
can't test in the python version, there is a typo in the test:
impo.assert_equals(tree_by_levels(None), [])
^^^^
test.assert_equals(tree_by_levels(Node(Node(None, Node(None, None, 4), 2), Node(Node(None, None, 5), Node(None, None, 6), 3), 1)), [1, 2, 3, 4, 5, 6])
Very difficult to understand the task without the examples in the tests