> > A better name would be clone(); copy() would work too, as long as
it's
> > clear that it copies the iterator, not the underlying sequence or
> > series. (Subtle difference!)
> >
> > Reiteration is a special case of cloning: simply stash away a clone
> > before you begin.
So far, all of my needs for re-iteration have been met by storing some
of the iterator's data. If all of it needs to be saved, I use list(it).
If only a portion needs to be saved, then I use the code from the tee()
example in the itertools documentation:
def tee(iterable):
"Return two independent iterators from a single iterable"
def gen(next, data={}, cnt=[0]):
dpop = data.pop
for i in itertools.count():
if i == cnt[0]:
item = data[i] = next()
cnt[0] += 1
else:
item = dpop(i)
yield item
next = iter(iterable).next
return (gen(next), gen(next))
Raymond Hettinger
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