Comments on: Simulating synchronous programming with Python generators http://daemons.net/~clay/2009/05/15/simulating-synchronous-programming-with-python-generators/ merely my musings Fri, 12 Mar 2010 15:34:34 +0000 http://wordpress.org/?v=2.9.2 hourly 1 By: Jonathan Aquino http://daemons.net/~clay/2009/05/15/simulating-synchronous-programming-with-python-generators/comment-page-1/#comment-95 Jonathan Aquino Sat, 16 May 2009 17:51:07 +0000 http://daemons.net/~clay/?p=287#comment-95 Nice 1-line description of continuations. Nice 1-line description of continuations.

]]> By: clay http://daemons.net/~clay/2009/05/15/simulating-synchronous-programming-with-python-generators/comment-page-1/#comment-93 clay Sat, 16 May 2009 07:27:27 +0000 http://daemons.net/~clay/?p=287#comment-93 As I discovered from the nice folks in #twisted shortly after posting this, both Python and Twisted offer features that make this kind of thing much better. First, <a href="http://www.python.org/dev/peps/pep-0342/" rel="nofollow">Python supports first-class coroutines</a>, meaning that the <code>yield</code> statement can return a value sent by the generator's consumer. Second, <a href="http://twistedmatrix.com/documents/8.2.0/api/twisted.internet.defer.html#inlineCallbacks" rel="nofollow">Twisted offers an inlineCallbacks() decorator</a> that lets you return a Deferred from your generator, so that the code calling the generator can setup callbacks and errbacks as with other asynchronous code. Alas, this is the story of my life: inventing things that are already invented :) As I discovered from the nice folks in #twisted shortly after posting this, both Python and Twisted offer features that make this kind of thing much better.

First, Python supports first-class coroutines, meaning that the yield statement can return a value sent by the generator’s consumer.

Second, Twisted offers an inlineCallbacks() decorator that lets you return a Deferred from your generator, so that the code calling the generator can setup callbacks and errbacks as with other asynchronous code.

Alas, this is the story of my life: inventing things that are already invented :)

]]> By: jml http://daemons.net/~clay/2009/05/15/simulating-synchronous-programming-with-python-generators/comment-page-1/#comment-92 jml Sat, 16 May 2009 07:02:52 +0000 http://daemons.net/~clay/?p=287#comment-92 <jml> claymation: you know about inlineCallbacks, right? <claymation> no <claymation> oh boy <jml> oh boy <jml> indeed :) http://twistedmatrix.com/documents/8.2.0/api/twisted.internet.defer.html#inlineCallbacks Well done on having the right intuition, btw. More generally, Python's continuation syntax can be used to model any system of wrapping values that follows the monad laws. <jml> claymation: you know about inlineCallbacks, right?
<claymation> no
<claymation> oh boy
<jml> oh boy
<jml> indeed :)

http://twistedmatrix.com/documents/8.2.0/api/twisted.internet.defer.html#inlineCallbacks

Well done on having the right intuition, btw. More generally, Python’s continuation syntax can be used to model any system of wrapping values that follows the monad laws.

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