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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.
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Make sure you're returning instead of printing. Read this too: https://github.com/codewars/codewars.com/wiki/Troubleshooting-your-solution
https://docs.python.org/3/library/re.html#re.findall
https://docs.python.org/3/library/re.html
I don't think there's enough information to answer your question. Things should work in any version of Python for this code, so maybe a syntax issue, and the Codewars interpretter only gives you I believe one option. So, what is the error code you get?
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Read this: https://github.com/codewars/codewars.com/wiki/Troubleshooting-your-solution
This comment is hidden because it contains spoiler information about the solution