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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.
I know it has been a while, but I had the same problem....
For me, stop using the min and max function got it working.
Yep, it shows me:
f(, )
Traceback:
in
in f
TypeError: 'int' object is not callable
In my console it works and prints a numeric result.