as kcrisman mentions, prod first gathers all the factors before it
multiplies them together. It does so for a reason: it takes the product in
a balanced fasion; not just going through the factors iteratively. I don't
know if it does an early exit if any zeros are encountered, but the
strategy of multiplying together in a tree-like configuration is a
significant optimisation for many common cases.
On Thursday, 22 September 2022 at 07:39:03 UTC-7 axio...@yahoo.de wrote:
> sage: def test(n):
> ....: print("n:", n)
> ....: return n
> ....:
> sage: l = [2,3,5,0,7,11,17,19]
> sage: prod(map(test, l))
> n: 2
> n: 3
> n: 5
> n: 0
> n: 7
> n: 11
> n: 17
> n: 19
> 0
> I expected that it would return 0 once we multiply with 0.
>
> Martin
>
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