I'm not sure what you were expecting. It does return 0, but it does so
after all the print statements are done. Remember, your "test" function
just returns the input, so the map function just returns a list (well, a
map object, but ...) and then we prod everything in the list. But that
happens AFTER you have done the map on test, and that requires printing out
all of them. The prod can't finish up until the entire list has been
processed via map and the function "test". I could imagine an alternate
implementation of prod which checked each time whether zero had been
produced in an intermediate step, but that doesn't appear to be in the code
in "prod??".
On Thursday, September 22, 2022 at 10:39:03 AM UTC-4 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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