[Python-ideas] Generators are iterators

[Guido van Rossum]

Everyone (including Chris), hold your horses. I will come up with better
words for the PEP. I apologize for the confusion.

On Wed, Dec 10, 2014 at 9:37 AM, Nathaniel Smith <njs at pobox.com> wrote:

> On 10 Dec 2014 16:38, "Chris Angelico" <rosuav at gmail.com> wrote:
> >
> > Would it be better to clarify that as "generator functions"? Maybe
> > something like this:
> >
> > """
> > Under this proposal, generator functions and iterators would be
> > distinct, but related, concepts.  Like the mixing of text and bytes in
> > Python 2, the mixing of generators and iterators has resulted in
> > certain perceived conveniences, but proper separation will make bugs
> > more visible. The distinction is simple: A generator function returns
> > a generator object. The latter is an iterator, having proper __iter__
> > and __next__ methods, while the former has neither and does not follow
> > iterator protocol.
> > """
>
> I find this more confusing than the original, actually, because now it
> sounds like you're saying that the distinction between a generator function
> and a generator instance is something new that this PEP is adding, in order
> to fix all the problems that are being caused by people writing 'for x in
> genfunc: ...'. Which doesn't make much sense. Like Nick said, it seems to
> me that the key distinction to emphasize is the distinction between
> generator function bodies and __next__ method bodies.
>
> -n
>
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-- 
--Guido van Rossum (python.org/~guido)
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