On Thursday, September 7, 2017 10:06:14 AM EDT Ethan Furman wrote:
> I might be, and I wouldn't be surprised. :) On the other hand, one
> can look at isolation as being a resource.
> > threading.local(), the isolation mechanism, is *implicit*.
>
> I don't think so. You don't get threading.local() unless you call it
> -- that makes it explicit.
> > decimal.localcontext() is an *explicit* resource manager that
> > relies on threading.local() magic. PEP 550 simply provides a
> > threading.local() alternative that works in tasks and generators.
> > That's it!
>
> The concern is *how* PEP 550 provides it:
>
> - explicitly, like threading.local(): has to be set up manually,
> preferably with a context manager
>
> - implicitly: it just happens under certain conditions
>
You literally replace threading.local() with contextvars.ContextVar():
import threading
_decimal_context = threading.local()
def set_decimal_context(ctx):
_decimal_context.context = ctx
Becomes:
import contextvars
_decimal_context = contextvars.ContextVar('decimal.Context')
def set_decimal_context(ctx):
_decimal_context.set(ctx)
Elvis
_______________________________________________
Python-Dev mailing list
Python-Dev@python.org
https://mail.python.org/mailman/listinfo/python-dev
Unsubscribe:
https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
