On 2015-05-07 1:42 PM, Guido van Rossum wrote:
On Tue, May 5, 2015 at 3:36 PM, Rajiv Kumar <rajiv.ku...@gmail.com> wrote:
I wrote a little example[1] that has a bare-bones implementation of Go
style channels via a custom event loop. I used it to translate the prime
sieve example from Go[2] almost directly to Python. The code uses "message
= await channel.receive()" to mimic Go's "message <- channel". Instead of
using "go func()" to fire off a goroutine, I add the PEP492 coroutine to my
simple event loop.
Cool example!
It's not an efficient implementation - really just a proof of concept that
you can use async/await in your own code without any reference to asyncio.
I ended up writing it as I was thinking about how PEP 342 style coroutines
might look like in an async/await world.
In the course of writing this, I did find that it would be useful to have
the PEP document how event loops should advance the coroutines (via
.send(None) for example). It would also be helpful to have the semantics of
how await interacts with different kinds of awaitables documented. I had to
play with Yury's implementation to see what it does if the __await__ just
returns iter([1,2,3]) for example.
I've found this too. :-) Yury, perhaps you could show a brief example in
the PEP of how to "drive" a coroutine from e.g. main()?
OK, will do!
Thanks,
Yury
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