[Python-ideas] Yet another sum function (fractions.sum)

[Clay Sweetser]

On Aug 19, 2013 6:09 AM, "Peter Otten" <__peter__ at web.de> wrote:
>
> If that takes on, and the number of sum implementations grows, maybe there
> should be a __sum__() special (class) method, and the sum built-in be
> changed roughly to
>
> def sum(items, start=0):
>     try:
>         specialized_sum = start.__sum__
>     except AttributeError:
>         return ... # current behaviour
>     return specialized_sum(items, start)
>
> sum(items, 0.0) would then automatically profit from the clever
> optimizations of math.fsum() etc.

Another possibility (and I'm not suggesting that it's better than the
proposed solution above) is to make a module just for the numerous sum
implementations people need.
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