[Python-Dev] [Python-ideas] PEP 3156 - Asynchronous IO Support Rebooted (original) (raw)

Guido van Rossum guido at python.org
Sat Dec 22 02:03:26 CET 2012

On Fri, Dec 21, 2012 at 2:26 PM, Jonathan Slenders <jonathan at slenders.be> wrote:

As far as I understand, "yield from" will always work, because a Future object can act like an iterator, and you can delegate your own generator to this iterator at the place of "yield from". "yield" only works if the parameter behind yield is already a Future object. Right Guido?

Correct! Sounds like you got it now.

That's the magic of yield from..

In case of sleep, sleep could be implemented to return a Future object.

It does; in tulip/futures.py:

def sleep(when, result=None): future = Future() future._event_loop.call_later(when, future.set_result, result) return future

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

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