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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.
groupby()
take iterable(sort of sequence) and return tuple of group key(str) and lazy iterator(itertols._grouper).So because its lazy it will give you a value only as in needed. But you can get sum of iterators values.
Then you need to create generator expression, which consist of
Hope i did it good.
thanks for explaining!
Can you please explain this solution? thanks
Can anyone explain this solution? thanks