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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.
This sentence is wrong: "This might be useful for sending something over a network, where you need to represent the memory size the item takes up." Amount of memory a python object takes in a running program, and amount of memory this data would take in an HTTP request, for example, are completely different things.
There is no definition - what the solution should do exactly? What should it determine?