Re: [Python-ideas] Start argument for itertools.accumulate() [Was: Proposal: A Reduce-Map Comprehension and a "last" builtin]

Tim Peters writes:

"Sum reduction" and "running-sum accumulation" are primitives in many peoples' brains.

I wonder what Kahneman would say about that. He goes to some length to explain that people are quite good (as human abilities go) at perceiving averages over sets but terrible at summing the same. Maybe they substitute the abstraction of summation for the ability to perform the operation? Steve