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Thu Sep 7 03:00:43 EDT 2017 · https://mail.python.org/pipermail/python-dev/2017-September/149277.html

Yury Selivanov wrote:
> I still think that giving Python programmers one strong rule: "context
> mutation is always isolated in generators" makes it easier to reason
> about the EC and write maintainable code.

Whereas I think it makes code *harder* to reason about,
because to take advantage of it you need to be acutely
aware of whether the code you're working on is in a
generator/coroutine or not.

It seems simpler to me to have one rule for all kinds
of functions: If you're making a temporary change to
contextual state, always encapsulate it in a with
statement.

-- 
Greg

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[Python-Dev] PEP 550 v4