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Fri Nov 24 21:21:29 EST 2017 · https://mail.python.org/pipermail/python-dev/2017-November/150813.html

On Fri, Nov 24, 2017 at 5:06 PM, Nathaniel Smith <njs at pobox.com> wrote:
> On Fri, Nov 24, 2017 at 4:22 PM, Guido van Rossum <guido at python.org> wrote:
>> The more I hear about this topic, the more I think that `await`, `yield` and
>> `yield from` should all be banned from occurring in all comprehensions and
>> generator expressions. That's not much different from disallowing `return`
>> or `break`.
>
> I would say that banning `yield` and `yield from` is like banning
> `return` and `break`, but banning `await` is like banning function
> calls.

I agree. I was going to make the point earlier in the thread that
using "await" can mostly just be thought of as a delayed function
call, but it didn't seem at risk of getting banned until Guido's
comment so I didn't say anything (and there were too many comments
anyways).

I think it's in a different category for that reason. It's much easier
to reason about than, say, "yield" and "yield from".

--Chris

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