[Python-Dev] PEP 567 v3 (original) (raw)

Antoine Pitrou solipsis at pitrou.net
Wed Jan 17 06:03:31 EST 2018

On Tue, 16 Jan 2018 17🔞06 -0800 Nathaniel Smith <njs at pobox.com> wrote:

On Tue, Jan 16, 2018 at 5:06 PM, Yury Selivanov <yselivanov.ml at gmail.com> wrote: > > I think it would be a very fragile thing In practice: if you have even > one variable in the context that isn't pickleable, your code that uses > a ProcessPool would stop working. I would defer Context pickleability > to 3.8+.

There's also a more fundamental problem: you need some way to match up the ContextVar objects across the two processes, and right now they don't have an attached module or qualname.

They have a name, though. So perhaps the name could serve as a unique identifier? Instead of being serialized as a bunch of ContextVars, the Context would then be serialized as a {name: value} dict.

Regards

Antoine.

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