[Twisted-Python] sleeping in inlineCallbacks

Terry Jones terry at jon.es
Thu Oct 29 11:49:24 EDT 2009

>>>>> "Brian" == Brian Granger <ellisonbg.net at gmail.com> writes:
Brian> I looked at deferLater, but am not using it right now.  The sleep
Brian> function I am using is basically the same as this - in my case
Brian> "sleep" turned out to be a little simpler because I don't have to
Brian> create and pass the clock around.  But I will probably use
Brian> deferLater for this same purpose in the future as well.

Hi Brian

Forgive me for butting in, but.... why :-)

Importing the reactor is no big deal, and if you use task.deferLater, apart
from not having to write any code you also have the advantage of being able
to pass it a result that the deferred will be called with.

For this reason you can also put a task.deferLater result into a callback
chain to achieve an async sleep and it will duly pass the result along. E.g.:
  from twisted.internet import reactor, task, defer

  d = somethingReturningADeferred()
  d.addCallback(lambda x: task.deferLater(reactor, 5.0, defer.passthru, x))


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