Re: best cumulative sum

David Isaac wrote:
 for a solution when these are available.

Something like:
def cumreduce(func, seq, init = None):
    """Return list of cumulative reductions.

This can be written more concisely as a generator:

 >>> import operator
 >>> def ireduce(func, iterable, init):
 ...     for i in iterable:
 ...         init = func(init, i)
 ...         yield init
 ...
 >>> list(ireduce(operator.mul, range(1,5),init=1))
 [1, 2, 6, 24]
 >>>

Michael


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