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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.
It's not a problem with Python. Most programming languages have a recursion depth limit to prevent the stack overflow error at runtime.
The other good option is Ellipsis.
I enjoyed this kata since I'm a big fan of regular expressions, But it's more suited at 5kyu instead of 4.
The rules are somewhat vague, but I really enjoyed creating efficient regex for this kata.
I spent a full day on it, but when it finally worked, it gave me pure satisfaction. Great kata!