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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 is certainly not best practice to put values to a list and then sum them up, when you could just add each value on the same variable.
Further i don't understand at all, why he used strings as dictionary keys, converting them later to int instead of using the required type in the dictionary in the first place.