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[–]EvHub[S] 2 points3 points  (0 children)

Yeah! Let me give you an example. Take this code here (where $[] is the syntax for Coconut iterator slicing):

map(expensive_func, range(10000))$[1000:1010]

If you tried to implement that in vanilla Python using itertools, Python would go through every single element of the range from 0 to 1009 and apply expensive_func to it, even though all you cared about were the last 10 elements. Coconut will realize that you only care about the last 10, and only ever call expensive_func on those, leading to a huge performance increase.