Home Original page

[Python-Dev] PEP 567 -- Context Variables

Yury Selivanov yselivanov.ml at gmail.com
Mon Dec 18 20:38:13 EST 2017 
On Mon, Dec 18, 2017 at 6:00 PM, Ivan Levkivskyi <levkivskyi at gmail.com> wrote:
> On 13 December 2017 at 22:35, Yury Selivanov <yselivanov.ml at gmail.com>
> wrote:
>>
>> [..]
>> >> A new standard library module ``contextvars`` is added
>> >
>> > Why not add this to contextlib instead of adding a new module?  IIRC
>> > this was discussed relative to PEP 550, but I don't remember the
>> > reason.  Regardless, it would be worth mentioning somewhere in the
>> > PEP.
>> >
>>
>> The mechanism is generic and isn't directly related to context
>> managers.  Context managers can (and in many cases should) use the new
>> APIs to store global state, but the contextvars APIs do not depend on
>> context managers or require them.
>>
>
> This was the main point of confusion for me when reading the PEP.
> Concept of TLS is independent of context managers, but using word "context"
> everywhere leads to doubts like "Am I getting everything right?" I think
> just adding the
> two quoted sentences will clarify the intent.

I'll try to clarify this in the Abstract section.

>
> Otherwise the PEP is easy to read, the proposed API looks simple, and this
> definitely will be a useful feature.

Thanks, Ivan!

Yury
More information about the Python-Dev mailing list