[Python-Dev] Tricky way of of creating a generator via a comprehension expression

[Ivan Levkivskyi]

On 22 November 2017 at 16:56, Yury Selivanov <yselivanov.ml at gmail.com>
wrote:

> On Wed, Nov 22, 2017 at 10:10 AM, Ivan Levkivskyi <levkivskyi at gmail.com>
> wrote:
> > On 22 November 2017 at 15:47, Paul Moore <p.f.moore at gmail.com> wrote:
> [...]
> I'm all for prohibiting using 'yield' expression in generator
> expressions or comprehensions.  The semantics is way to hard to
> understand and hence be of any value.
>
> Making 'await' a SyntaxError is absolutely not an option.  Async
> generator expressions are a shorthand syntax for defining asynchronous
> generators (PEP 525), and it's already being used in the wild.
>

OK, makes sense, so it looks like we may have the following plan:

- fix `yield` in comprehensions
- update PEP 530 and docs re generator expressions vs comprehensions
- make `yield` in generator expressions a SyntaxError

If everyone agrees, then I propose to open a separate issue on b.p.o. to
coordinate the efforts.

--
Ivan
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