[Python-ideas] Reduce/fold and scan with generator expressions and comprehensions

[Rob Cliffe]

On 24/10/2016 06:11, Danilo J. S. Bellini wrote:
>  For example, a product:
>
> >>> [prev * k for k in [5, 2, 4, 3] from prev = 1]
> [1, 5, 10, 40, 120]
>
> That makes sense for me, and seem simpler than:
>
> >>> from itertools import accumulate, chain
> >>> list(accumulate(chain([1], [5, 2, 4, 3]), lambda prev, k: prev * k))
> [1, 5, 10, 40, 120]
>
Well, if you want an instant reaction from someone skimming this thread: 
I looked at the first example and couldn't understand it. Then I looked 
at the second one, and could understand it (even though I may never have 
used "chain" or heard of "accumulate"). Obviously your mileage varies.
Best wishes,
Rob Cliffe

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