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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.
yes, but as i recall you should import itertools module first before use the permutations method, and clearly there is no import command in the code above. does this "permutations" refered to the name of the function?
what does "permutations(s[:i]+s[i+1:])" do?
what is the purpose of "any" in the code above?