[Python-Dev] async/await in Python; v2

[Guido van Rossum]

On Wed, Apr 22, 2015 at 5:12 PM, Greg Ewing <greg.ewing at canterbury.ac.nz>
wrote:

> Guido van Rossum wrote:
>
>> On Wed, Apr 22, > OTOH I'm still struggling with what you have to do to
>> wrap a coroutine in a Task, the way its done in asyncio by the Task()
>> constructor, the loop.create_task() method, and the async() function
>>
>
> That's easy. You can always use costart() to adapt a cofunction
> for use with something expecting a generator-based coroutine,
> e.g.
>
> codef my_task_func(arg):
>   ...
>
> my_task = Task(costart(my_task_func, arg))
>
> If you're willing to make changes, Task() et al could be made to
> recognise cofunctions and apply costart() where needed.


Hm, that feels backwards incompatible (since currently I can write
Task(my_task_func(arg)) and also a step backwards in elegance (having to
pass the args separately).

OTOH the benefit is that it's much harder to accidentally forget to wait
for a coroutine. And maybe the backward compatibility issue is not really a
problem because you have to opt in by using codef or async def.

So I'm still torn. :-)

Somebody would need to take a mature asyncio app and see how often this is
used (i.e. how many place would require adding costart() as in the above
example).

-- 
--Guido van Rossum (python.org/~guido)
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