On Sun, Mar 27, 2011 at 6:52 PM, raymond.hettinger < python-check...@python.org> wrote:
> -.. function:: accumulate(iterable) +.. function:: accumulate(iterable[, func]) > > Make an iterator that returns accumulated sums. Elements may be any > addable > - type including :class:`Decimal` or :class:`Fraction`. Equivalent to:: > + type including :class:`Decimal` or :class:`Fraction`. If the optional > + *func* argument is supplied, it should be a function of two arguments > + and it will be used instead of addition. > Is there a good use-case for the func argument? I can only think of bad use-cases (where "func" does something that does not remotely resemble addition). I fear that people will actually implement these bad use-cases, and I will have to try to read and understand their code. Adding the func argument seems analogous to adding a func argument to sum(), which would give it all of the power of reduce(). -- Daniel Stutzbach
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