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[Python-ideas] PEP draft: context variables

Koos Zevenhoven k7hoven at gmail.com
Tue Sep 5 13:31:45 EDT 2017 
On Tue, Sep 5, 2017 at 8:24 PM, Yury Selivanov <yselivanov.ml at gmail.com>
wrote:

> On Tue, Sep 5, 2017 at 9:12 AM, Koos Zevenhoven <k7hoven at gmail.com> wrote:
> > On Tue, Sep 5, 2017 at 6:53 PM, Yury Selivanov <yselivanov.ml at gmail.com>
> > wrote:
> >>
> >> On Tue, Sep 5, 2017 at 8:35 AM, Koos Zevenhoven <k7hoven at gmail.com>
> wrote:
> >> > On Tue, Sep 5, 2017 at 3:49 AM, Nathaniel Smith <njs at pobox.com>
> wrote:
> >> [..]
> >> >>
> >> >> I think PEP 550 is sufficient to allow implementing all
> >> >> your proposed APIs (and that if it isn't, that's a bug in PEP 550).
> >> >
> >> >
> >> > That's not true either. The LocalContext-based semantics introduces
> >> > scope
> >> > barriers that affect *all* variables. You might get close by putting
> >> > just
> >> > one variable in a LogicalContext and then nest them, but PEP 550 does
> >> > not
> >> > allow this in all cases. With the addition of PEP 521 and some
> trickery,
> >> > it
> >> > might.
> >>
> >> I think you have a wrong idea about PEP 550 specification.  I
> >> recommend you to reread it carefully, otherwise we can't have a
> >> productive discussion here.
> >>
> >
> > I'm sorry, by LocalContext I meant LogicalContext, and by "nesting"
> them, I
> > meant stacking them. It is in fact nesting in terms of value scopes.
>
> I don't actually care if you use the latest terminology.  You seem to
> have a wrong idea about how PEP 550 really works (and its full
> semantics), because things you say here about it don't make any sense.
>

​In PEP 550, introducing a new LogicalContext on the ExecutionContext
affects the scope of
​any_
var.set(value)​ for *
​any
*
​any_var
.
​ Does that not make sense?​


–– Koos


-- 
+ Koos Zevenhoven + http://twitter.com/k7hoven +
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