[Python-Dev] Fwd: summing a bunch of numbers (or "whatevers")
Sun, 20 Apr 2003 10:29:04 -0400
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 + )
> 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)