[Python-Dev] PEP 492: No new syntax is required

[Guido van Rossum]

But new syntax is the whole point of the PEP. I want to be able to
*syntactically* tell where the suspension points are in coroutines.
Currently this means looking for yield [from]; PEP 492 just adds looking
for await and async [for|with]. Making await() a function defeats the
purpose because now aliasing can hide its presence, and we're back in the
land of gevent or stackless (where *anything* can potentially suspend the
current task). I don't want to live in that land.

On Sun, Apr 26, 2015 at 1:21 PM, Mark Shannon <mark at hotpy.org> wrote:

> Hi,
>
> I was looking at PEP 492 and it seems to me that no new syntax is required.
>
> Looking at the code, it does four things; all of which, or a functional
> equivalent, could be done with no new syntax.
> 1. Make a normal function into a generator or coroutine. This can be done
> with a decorator.
> 2. Support a parallel set of special methods starting with 'a' or 'async'.
> Why not just use the current set of special methods?
> 3. "await". "await" is an operator that takes one argument and produces a
> single result, without altering flow control and can thus be replaced by an
> function.
> 4. Asynchronous with statement. The PEP lists the equivalent as "with
> (yield from xxx)" which doesn't seem so bad.
>
> Please don't add unnecessary new syntax.
>
> Cheers,
> Mark.
>
> P.S. I'm not objecting to any of the other new features proposed, just the
> new syntax.
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-- 
--Guido van Rossum (python.org/~guido)
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