Python Tutorial Was: Guido's regrets: filter and map
Anders J. Munch
andersjm at dancontrol.dk
Wed Nov 27 04:49:02 EST 2002
"Lulu of the Lotus-Eaters" <mertz at gnosis.cx>:
> ||And it doesn't replace reduce at all -- we've yet to see a construct
> ||proposed to do that (aside from writing it out as an explicit loop).
>
> Actually... here's an... ummm... "improved" version:
>
> reduce = lambda func, seq, init=None:\
> [(l.append(func(l[i],seq[i])),l[-1])
> for l in [[init or seq[0]]]
> for i in range(len(seq))][-1][1]
>
> Yours, Lulu...
Needs more "improvement" ;-)
>>> reduce(operator.add, [1,2,3])
6
>>> lulu_reduce(operator.add, [1,2,3])
7
>>>def yieldall(seq):
>>> for x in seq: yield x
>>> reduce(operator.add, yieldall([1,2,3]))
6
>>>lulu_reduce(operator.add, yieldall([1,2,3]))
TypeError: unsubscriptable object
- Anders
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