Hi,
On Fri, Apr 3, 2009 at 17:45, Sebastian Rittau
<srittau at jroger.in-berlin.de> wrote:
> I am missing a simple way to retrieve the "first" element of any
> iterable in python that matches a certain condition anyway. Something
> like this:
>
> def first(iter, cb):
> for el in iter:
> if cb(el):
> return el
> raise IndexError()
>
> Or (shorter, but potentially slower):
>
> def first(iter, cb):
> return [el for el in iter if cb(el)][0]
>
> To be used like this:
>
> my_el = first(my_set, lambda el: el == "foobar")
>
> This is something I need from time to time and this also seems to solve
> your problem.
def first(iter, cb):
return itertools.ifilter(cb, iter).next()
--
Amaury Forgeot d'Arc
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