On 25 Jun 2013 00:31, "alex23" <wuwe...@gmail.com> wrote: > > On 25/06/2013 6:12 AM, Ian Kelly wrote: >> >> On Mon, Jun 24, 2013 at 1:52 PM, <jim...@aol.com> wrote: >>> >>> Syntax: >>> fwhile X in ListY and conditionZ: >>> >>> fwhile would act much like 'for', but would stop if the condition after the >>> 'and' is no longer True. >> >> >> I would advocate using the break myself. Another alternative is this: >> >> for X in itertools.takewhile(lambda X: conditionZ, ListY): >> ... > > > I'd probably just go with a generator expression to feed the for loop: > > for X in (i for i in ListY if conditionZ): > ....
That is nice but it's not lazy. If the condition or the iterables took too long to compute, it would be troublesome.
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