[Python-Dev] [Python-ideas] PEP 3156 - Asynchronous IO Support Rebooted

Guido van Rossum guido at python.org
Sat Dec 22 02:24:15 CET 2012

On Fri, Dec 21, 2012 at 5:17 PM, Jasper St. Pierre
<jstpierre at mecheye.net> wrote:
> On Fri, Dec 21, 2012 at 8:02 PM, Guido van Rossum <guido at python.org> wrote:
> ... snip ...
>> In PEP 3156 conformant code you're supposed always to use 'yield
>> from'. The only time you see a bare yield is when it's part of the
>> implementation's internals. (However I think tulip actually will
>> handle a yield the same way as a yield from, except that it's slower
>> because it makes a roundtrip to the scheduler, a.k.a. trampoline.)
> Would it be possible to fail on "yield"? Silently being slower when you
> forget to type a keyword is something I can imagine will creep up a lot by
> mistake, and I don't think it's a good idea to silently be slower when the
> only different is five more characters.

That's also a possibility. If someone can figure out a patch that
would be great.

--Guido van Rossum (python.org/~guido)

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