On Dec 19, 2007 3:18 AM, Realazy XA Chen <[EMAIL PROTECTED]> wrote:
>
> it seems that iterbetter object is always be True even though it has
> not any item in in. so i just wondering if iterbetter object is empty,
> can web.py return a False for me? that will be very useful.
IterBetter's behavior matches that of normal Python iterators:
>>> bool(iter([]))
True
There's no way that an iterator can know whether it's empty or not -
by definition it reads from its source lazily.
> and now I also want to know how to detect an iterbetter object empty
> or not? currently I use try.
Like most questions about IterBetter, the solution to this one is to
turn it into a list:
my_list = list(my_iter)
if my_list:
do_stuff_with(my_list)
else:
print 'empty!'
--
Gary
http://blog.extracheese.org
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