Re: best cumulative sum

David Isaac wrote:

> def ireduce(func, iterable, init=None):
> if init is None:
> iterable = iter(iterable)
> init = iterable.next()
> yield init
> elif not iterable:

You are in for a surprise here:

>>> def empty():
.... for item in []:
.... yield item
....
>>> bool(empty())
True

>>> bool(iter([]))
True # python 2.3 and probably 2.5

>>> bool(iter([]))
False # python 2.4

> yield init
> for item in iterable:
> init = func(init, item)
> yield init

Peter

.

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