[Python-Dev] PEP 550 v4
Yury Selivanov
yselivanov.ml at gmail.com
Sat Aug 26 12:25:24 EDT 2017
On Fri, Aug 25, 2017 at 10:19 PM, Ethan Furman <ethan at stoneleaf.us> wrote:
> All in all, I like it. Nice job.
Thanks!
>
> On 08/25/2017 03:32 PM, Yury Selivanov wrote:
>
>> A *context variable* is an object representing a value in the
>> execution context. A new context variable is created by calling
>> the ``new_context_var()`` function. A context variable object has
>> two methods:
>>
>> * ``lookup()``: returns the value of the variable in the current
>> execution context;
>>
>> * ``set()``: sets the value of the variable in the current
>> execution context.
>
>
> Why "lookup" and not "get" ? Many APIs use "get" and it's functionality is
> well understood.
ContextVar.set(value) method writes the `value` to the *topmost LC*.
ContextVar.lookup() method *traverses the stack* until it finds the LC
that has a value. "get()" does not reflect this subtle semantics
difference.
Yury
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