On Sat, Jun 18, 2022 at 5:42 PM Rob Cliffe via Python-ideas < python-ideas@python.org> wrote:
> To me, the natural implementation of slicing on a non-reusable iterator > (such as a generator) would be that you are not allowed to go backwards > or even stand still: > mygen[42] > mygen[42] > ValueError: Element 42 of iterator has already been used I agree that indexing an iterator such that it could only go forward feels like a reasonable and useful feature in python, but I disagree about the ValueError. To me the above produces two values: the 43rd and 85th elements produced by mygen. Anything else is a bizarre error waiting to arise at obscure times. What if this iterator is passed to another function? Used in a loop? Now this information about what index has been used has to be carried around and checked on every access. Regards, Jeremiah
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