[Python-ideas] yield from multiple iterables (was Re: The async API of the future: yield-from)

[Christian Tismer]

On 15.10.12 16:46, Nick Coghlan wrote:
> On Mon, Oct 15, 2012 at 11:57 PM, Christian Tismer <tismer at stackless.com> wrote:
...
>> Alternatively I could also imagine to write real generators or coroutines
>> as an extension module. It would use the same concept as generators,
>> internally. No big deal, not changing the interpreter, maybe adding a bit.
> Tangentially related, there are some patches [1,2] on the tracker
> looking to shuffle a few things related to generator state around to
> get them out of the frame objects and into the generator objects where
> they belong. There are definitely a few things that could do with
> cleaning up in this space.
>
> [1] http://bugs.python.org/issue13897
> [2] http://bugs.python.org/issue13607

Thanks for pointing me at that. I think Mark Shannon has quite similar 
thoughts.
I need to talk to him.
>> I think this would make Greenlet and even Stackless obsolete in most
>> cases which are of real use.
> The "take this synchronous code and magically make it scale better"
> aspect is still a nice feature of greenlets & gevent.

I had a deeper look into gevent and how it uses greenlet and
does its monkey-patching. Indeed, cute!
My assumption was that I could write a surrogate greenlet
using the advanced generators.

But I overlooked that for this to work, everything must behave
like generators. Not only the surrogate greenlet, but also
the code that it wants to switch. Argh...

A work-around for gevent would be a rewrite of all supported
modules to patch. Not a cake walk.

Thanks, you gave me a lot of insight!
>> I would like to discuss this and maybe do a prototype.
> Sure, I think there's several things we can do better here, and I
> think the test suite is comprehensive enough to keep us honest.
>
> Cheers,
> Nick.
>

Cheers - Chris

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