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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.
Hi. You can add a default value for the parameter in the function definition.
Example:
def arr(n=0).What that's doing is basically saying "n is equal to the value passed when calling the function. But, if no value is passed, then use 0 instead".