best cumulative sum

[David Isaac]

"Peter Otten" <__peter__ at web.de> wrote in message
news:dm263o$b8b$02$1 at news.t-online.com...
> - allows arbitrary iterables, not sequences only
> - smaller memory footprint if sequential access to the items is sufficient

Sure; I meant aside from that.

> - fewer special cases, therefore
> - less error prone, e. g.
>    + does your implementation work for functions with
>      f(a, b) != f(b, a)?

See news:Mzpgf.12794$NN2.4089 at trnddc02

>    + won't users be surprised that
>      cumreduce(f, [1]) == cumreduce(f, [], 1)
>      !=
>      cumreduce(f, [0]) == cumreduce(f, [], 0)

THANKS!

> Of course nothing can beat a plain old for loop in terms of readability
and
> -- most likely -- speed.

OK.

Thanks,
Alan Isaac