[Python-Dev] Timeout for PEP 550 / Execution Context discussion

Guido van Rossum guido at python.org
Mon Oct 16 01:04:31 EDT 2017

On Sun, Oct 15, 2017 at 8:12 PM, Nick Coghlan <ncoghlan at gmail.com> wrote:

> On 16 October 2017 at 11:33, Yury Selivanov <yselivanov.ml at gmail.com>
> wrote:
>> Stage 2. When Python 3.7 is out, we'll see how people use execution
>> contexts for async code and collect feedback.  If we recognize that
>> Python users want execution contexts for generators/asynchronous
>> generators, we'll make a new PEP to add support for them in Python
>> 3.8.  That future discussion will be focused on generators
>> specifically, and therefore I expect it to be somewhat more focused.
> As long as it's made clear that the interaction between context variables
> and generators is formally undefined in 3.7, I think that's reasonable -
> folks that want to ensure the current behaviour indefinitely should keep
> using thread locals rather than switching over to context variables.

It shouldn't be formally undefined. It should have the semantics it
acquires when you combine the existing (well-defined) formal semantics of
generators with the (to be defined) formal semantics of context variables.

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