[Python-Dev] PEP 492 vs. PEP 3152, new round (original) (raw)

Yury Selivanov yselivanov.ml at gmail.com
Wed Apr 29 20:46:14 CEST 2015

Hi Ethan,

On 2015-04-29 2:32 PM, Ethan Furman wrote:

On 04/29, Yury Selivanov wrote:

On 2015-04-29 1:25 PM, Ethan Furman wrote:

cannot also just work and be the same as the parenthesized version. Because it does not make any sense. I obviously don't understand your position that "it does not make any sense" -- perhaps you could explain a bit? What I see is a suspension point that is waiting for the results of coro(), which will be negated (and returned/assigned/whatever). What part of that doesn't make sense?

Because you want operators to be resolved in the order you see them, generally.

You want '(await -fut)' to:

  1. Suspend on fut;
  2. Get the result;
  3. Negate it.

This is a non-obvious thing. I would myself interpret it as:

  1. Get fut.neg();
  2. await on it.

So I want to make this syntactically incorrect:

'await -fut' would throw a SyntaxError. To do what you want, write a pythonic '- await fut'.

Yury

More information about the Python-Dev mailing list