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On 16 October 2017 at 11:33, Yury Selivanov <yselivanov.ml@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.