Neil Cerutti wrote: > 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 You could raise a different Exception, PeekPastEndEception ? - Paddy.
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