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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.
It is bad practice to create a list in the sum function. A generator will not allocate memory. Also, I find x and y to be better names for points in this, i.e. math, domain.
Using package not in the standard python library like numpy, to test others is not very good.
I think we come here to train language , not the special library.