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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.
Tabs specifically have different meaning for different softwares, like some will have (1 Tab = 3 Spaces)OR(1 Tab = 4 Spaces). So you should be careful while using Python. Also the Tabs are not Traditionally intended to be used.
In python you should be using spaces, not tabs. Your python interperater most likely converts your tabs to 8 spaces automatically, but codewars does not.
Also this should have been marked as a question, not as an issue. Please only mark issues if you see something wrong with the Kata itself.