On 2007-01-10, Steven Bethard <[EMAIL PROTECTED]> wrote: > Neil Cerutti wrote: >> For use in a hand-coded parser I wrote the following simple >> iterator with look-ahead. > > There's a recipe for this: > > http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/304373 > > Note that the recipe efficiently supports an arbitrary > look-ahead, not just a single item. > >> I haven't thought too deeply about what peek ought to return >> when the iterator is exhausted. Suggestions are respectfully >> requested. > > In the recipe, StopIteration is still raised on a peek() > operation that tries to look past the end of the iterator.
That was all I could think of as an alternative, but that makes it fairly inconvenient to use. I guess another idea might be to allow user to provide a "no peek" return value in the constructor, if they so wish. -- Neil Cerutti -- http://mail.python.org/mailman/listinfo/python-list
