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Mon Aug 28 11:53:53 EDT 2017 · https://mail.python.org/pipermail/python-dev/2017-August/149011.html

A question appeared here about a simple mental model for PEP 550.
It looks much clearer now, than in the first version, but I still would
like to clarify: can one say that PEP 550 just provides more fine-grained
version of threading.local(), that works not only per thread, but even per
coroutine within the same thread?

--
Ivan

On 28 August 2017 at 17:29, Yury Selivanov <yselivanov.ml at gmail.com> wrote:

> On Mon, Aug 28, 2017 at 11:26 AM, Ethan Furman <ethan at stoneleaf.us> wrote:
> > On 08/28/2017 04:19 AM, Stefan Krah wrote:
> >
> >> What about this?
> >>
> >> async def bar():
> >>      setcontext(Context(prec=1))
> >>      for i in range(10):
> >>          await asyncio.sleep(1)
> >>          yield i
> >>
> >> async def foo():
> >>      async for i in bar():
> >>          # ctx.prec=1?
> >>          print(Decimal(100) / 3)
> >
> >
> > If I understand correctly, ctx.prec is whatever the default is, because
> foo
> > comes before bar on the stack, and after the current value for i is
> grabbed
> > bar is no longer executing, and therefore no longer on the stack.  I hope
> > I'm right.  ;)
>
> You're right!
>
> Yury
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[Python-Dev] PEP 550 v4