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Wed Nov 22 11:58:08 EST 2017 · https://mail.python.org/pipermail/python-dev/2017-November/150704.html

On Wed, Nov 22, 2017 at 11:11 AM, Paul Moore <p.f.moore at gmail.com> wrote:
[..]
> But by the logic you just described, await isn't (or shouldn't be)
> allowed, surely?

No, that's a stretch. People can understand and actually use 'yield
(await foo())', but they usually can't figure what  'yield (yield
foo())' actually does:

   def foo():
       yield (yield 1)

Who on this mailing list can meaningfully use the 'foo()' generator?

   async def bar():
       yield (await foo())

'bar()' is perfectly usable in an 'async for' statement and it's easy
to understand what it does if you spend an hour writing async/await
code.

Yury

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