On Sun, Apr 20, 2003 at 03:42:26AM -0500, Ka-Ping Yee wrote: > New question: what is add([])? If add() is really polymorphic, then > this should probably raise an exception (just like min() and max() do). > That would lead to idioms such as > > add(numberlist + [0]) > > add(stringlist + ['']) > > I suppose those don't look too bad. Nothing vastly better springs > to mind. For a large numberlist this is a problem, it causes a copy of the whole list. Not to mention it looks like a perl coercion hack. The third argument to reduce is there to avoid the hack. so now we have from newmodule import add answer = add(numberlist, 0) why don't we just write it as from operator import add answer = reduce(add, numberlist, 0) -jack
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