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Showing content from https://mail.python.org/pipermail/python-dev/2018-January/151614.html below:

[Python-Dev] PEP 567 v2

[Python-Dev] PEP 567 v2Paul Moore p.f.moore at gmail.com
Fri Jan 5 06:10:07 EST 2018
On 5 January 2018 at 11:06, Victor Stinner <victor.stinner at gmail.com> wrote:
>> Le 5 janv. 2018 11:42 AM, "Paul Moore" <p.f.moore at gmail.com> a écrit :
>> """
>> A Context is a mapping from ContextVar objects to their values. The
>> Context itself exposes the Mapping interface, so cannot be modified
>> directly - to modify the value associated with a variable you need to
>> use the ContextVar.set() method.
>> """
>>
>> Does that explain things correctly? One thing I am sure of is that we
>> should remove "implemented using an immutable dictionary" - it's an
>> implementation detail, and adds nothing but confusion to mention it
>> here.

> You can only modify a context when it's the current context, so using
> ContextVar.set() in Context.run().

Thanks. That's a useful qualification. But it may be too detailed for
the summary - it's certainly something that should be covered in the
specification section, though. Maybe "...  you need to use the
ContextVar.set() method from Context.run()" would be OK, although I
don't want the summary to get too long.

Paul
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