[Python-Dev] PEP 492: async/await in Python; v3
Yury Selivanov
yselivanov.ml at gmail.com
Tue Apr 28 17:21:13 CEST 2015
Hi Walter,
On 2015-04-28 10:23 AM, Walter Dörwald wrote:
>> Key properties of coroutines:
>>
>> * ``async def`` functions are always coroutines, even if they do not
>> contain ``await`` expressions.
>>
>> * It is a ``SyntaxError`` to have ``yield`` or ``yield from``
>> expressions in an ``async`` function.
>
> Does this mean it's not possible to implement an async version of
> os.walk() if we had an async version of os.listdir()?
>
> I.e. for async code we're back to implementing iterators "by hand"
> instead of using generators for it.
For now yes. Unfortunately, we don't have time to implement
coroutine-generators properly in 3.5.
Thanks,
Yury
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