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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.
.format() is older as it was introduced in python 2.6 while f-string is newer and from python 3.6
F-strings are generally more compact than .format() and easier to decipher but the biggest difference is in the ability for expressions within the f-string to be performed at runtime. This allows for things such as calling functions, creating classes, and math operations.
Additionally, f-strings are faster than .format()
Nice solution. I originally tried going the memoization route but worried about memory usage.