On Jan 17, 11:59 pm, Paul Hankin <[EMAIL PROTECTED]> wrote:
> Instead of counting the exceptions, we can limit the padding iterables
> by using an iterator that returns len(iterables) - 1 padding
> generators, use a sort of lazy chain, and then just izip.
>
> from itertools import izip, repeat
>
> def chain_next(xs, yg):
> for x in xs: yield x
> for y in yg.next(): yield y
>
> def izippad(*xs, **kw):
> padder = repeat(kw.get('padding', None))
> padder_gen = repeat(padder, len(xs) - 1)
> return izip(*[chain_next(x, padder_gen) for x in xs])
I have had the need for such a 'padded zip' before and my
implementation was eerily similar:
from itertools import repeat, chain, izip
def repeatnext(iterator):
val = iterator.next()
while True: yield val
def longzip(default, *iterables):
defaultgen = repeat(default, len(iterables) - 1)
return izip(*[chain(it, repeatnext(defaultgen)) for it in
iterables])
--
Arnaud
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