On Mon, Apr 20, 2020 at 03:28:09PM -0700, Andrew Barnert via Python-ideas wrote:
> Admittedly, such cases are almost surely not that common, but I
> actually have some line-numbering code that did something like this
> (simplified a bit from real code):
>
> yield from enumerate(itertools.chain(headers, [''], body, [''])
>
> … but then I needed to know how many lines I yielded, and there’s no
> way to get that from enumerate, so instead I had to do this:
Did you actually need to "yield from"? Unless your caller was sending
values into the enumerate iterable, which as far as I know enumerate
doesn't support, "yield from" isn't necessary.
for t in enumerate(itertools.chain(headers, [''], body, ['']):
yield t
lines = t[0]
> counter = itertools.count()
> yield from zip(counter, itertools.chain(headers, [''], body, [''])
> lines = next(counter)
That gives you one more than the number of lines yielded.
--
Steven
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