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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.
No one is faster: https://stackoverflow.com/questions/26540885/lambda-is-slower-than-function-call-in-python-why
lambda is indeed faster, but according to the PEP8, it is preferable to use the def statement
i think lambda is faster than def, maybe not sure tho
you can use a list.
It seems to me that all previous years were better, since the point is not in readability, but in the beauty of the code)
Nice..!