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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.
You're right about anti-pattern. However this code is made for golfing purpose - writing shortest solution possible - certainly not for production, so it doesn't need to enforce PEP8.
However,
sis better thatstrbecausestris a built-in type in python