On Fri, Feb 19, 2021 at 4:08 AM Guido van Rossum <[email protected]> wrote:
> Can you try this?
>
> async def __sleep(self):
> await None
That didn't work*, but this does:
async def __sleep():
return None
Was that the idea?
(*) TypeError: object NoneType can't be used in 'await' expression
>
> On Thu, Feb 18, 2021 at 22:31 Luciano Ramalho <[email protected]> wrote:
>>
>> Follow up question: what's the plan to replace this use of
>> `@types.coroutine` in `asyncio/tasks.py`? [1]
>>
>> @types.coroutine
>> def __sleep0():
>> """<docstring omitted>"""
>> yield
>>
>> [1] https://github.com/python/cpython/blob/master/Lib/asyncio/tasks.py#L585
>>
>> Best,
>>
>> Luciano
>>
>> On Fri, Feb 19, 2021 at 2:31 AM Luciano Ramalho <[email protected]> wrote:
>> >
>> > On Fri, Feb 19, 2021 at 1:59 AM Guido van Rossum <[email protected]> wrote:
>> > >> 1) What Python construct is to be used at the end of a chain of await
>> > >> calls, if not of a generator-based coroutine decorated with
>> > >> `@types.coroutine` and using a `yield` expression in its body?
>> >
>> > > At the end of the chain you can call the __await__() method which gives
>> > > an iterator, and then you call next() or send() on that iterator. Each
>> > > next()/send() call then represents an await step, and send() in general
>> > > is used to provide an awaited result. Eventually this will raise
>> > > StopIteration with a value indicating the ultimate result (the return
>> > > value of the top-level async def).
>> >
>> > All right, that made sense to me. Thank you so much, Guido.
>> >
>> > Thanks for the clarification about `@types.coroutine` as well.
>> >
>> > Take care,
>> >
>> > Luciano
>> >
>> >
>> > --
>> > Luciano Ramalho
>> > | Author of Fluent Python (O'Reilly, 2015)
>> > | http://shop.oreilly.com/product/0636920032519.do
>> > | Technical Principal at ThoughtWorks
>> > | Twitter: @ramalhoorg
>>
>>
>>
>> --
>> Luciano Ramalho
>> | Author of Fluent Python (O'Reilly, 2015)
>> | http://shop.oreilly.com/product/0636920032519.do
>> | Technical Principal at ThoughtWorks
>> | Twitter: @ramalhoorg
>
> --
> --Guido (mobile)
--
Luciano Ramalho
| Author of Fluent Python (O'Reilly, 2015)
| http://shop.oreilly.com/product/0636920032519.do
| Technical Principal at ThoughtWorks
| Twitter: @ramalhoorg
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