On Fri, 15 May 2020 at 21:50, Eric V. Smith <e...@trueblade.com> wrote:
> I fear that my comment on some text in the PEP was lost amidst the
> voting, so I'm repeating it here. This will probably screw up some
> threading, but this is the oldest message I have to reply to.
>
> The PEP says "At most one additional item may be consumed from one of
> the iterators when compared to normal zip usage." I think this should be
> prefaced with "If ValueError is raised ...". Also, why does it say "at
> most one additional item". How could it ever be less than one?
>
It seems to me, looking at the Python implementation in the PEP (not the
current or C implementation) that the crux is here:
except StopIteration:
if not strict:
return
if items:
i = len(items) + 1
raise ValueError(f"zip() argument {i} is too short")
So if it is not strict, it will return/stop consuming iterators. If it is
strict but it runs out *not* on the first iterator it will also not consume
from another iterator?
> And I'm not sure I'd say "normal zip usage", maybe "the existing builtin
> zip function".
>
Depends on where we end up I guess, if we go with what Brandt' PEP says
(makes sense to keep internally consistent) I'd say "zip without the
strict=True flag" or similar.
>
> Eric
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