[New-bugs-announce] [issue44963] anext_awaitable is not a collections.abc.Generator

[Daniel Pope]

New submission from Daniel Pope <lord.mauve at gmail.com>:

The anext_awaitable object returned by anext(..., default) does not support .send()/.throw(). It only supports __next__().

So we can pass messages from the suspending coroutine to the event loop but not from the event loop to the suspending coroutine.

trio and curio rely on both directions working. (I don't know about asyncio.)

For example, this trio code fails:

    import trio

    async def produce():
       for v in range(3):
           await trio.sleep(1)
           yield v

    async def consume():
       p = produce()
       while True:
            print(await anext(p, 'finished'))

    trio.run(consume)

raising AttributeError: 'anext_awaitable' object has no attribute 'send'.

I realise that any awaitable that wants to await another awaitable must return not an iterator from __await__() but something that implements the full PEP-342 generator protocol. Should PEP-492 section on __await__()[1] say something about that?

[1] https://www.python.org/dev/peps/pep-0492/#await-expression

----------
components: Library (Lib)
messages: 399982
nosy: lordmauve
priority: normal
severity: normal
status: open
title: anext_awaitable is not a collections.abc.Generator
type: behavior
versions: Python 3.10, Python 3.11

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue44963>
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