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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.
click the drop down at the top of the kata and you can select the version
As JStegg wrote - f string is available in python >= 3.6. It is new feature (great in my opinion;)). You can choose python version for almost every kata on codewars.
You need to use 3.6