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Thu Dec 28 05:20:05 EST 2017 · https://mail.python.org/pipermail/python-dev/2017-December/151472.html

On Thu, Dec 28, 2017 at 1:51 AM, Victor Stinner
<victor.stinner at gmail.com> wrote:
> var = ContextVar('var', default=42)
>
> and:
>
> var = ContextVar('var')
> var.set (42)
>
> behaves the same, no?

No, they're different. The second sets the value in the current
context. The first sets the value in all contexts that currently
exist, and all empty contexts created in the future.

-n

-- 
Nathaniel J. Smith -- https://vorpus.org

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[Python-Dev] PEP 567 v2