[Python-Dev] Timeout for PEP 550 (original) (raw)

[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.

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