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copied!<p>My reaction is to suggest Twisted, but you've already looked at this. Still, I stick by my answer. Without knowing you personal pain-points, I can at least share some things that helped me reduce almost all of the deferred-madness that arises when you have several dependent, blocking actions you need to perform for a client.</p> <p>Inline callbacks (lightly documented here: <a href="http://twistedmatrix.com/documents/8.2.0/api/twisted.internet.defer.html" rel="nofollow noreferrer">http://twistedmatrix.com/documents/8.2.0/api/twisted.internet.defer.html</a>) provide a means to make long chains of deferreds much more readable (to the point of looking like straight-line code). There is an excellent example of the complexity reduction this affords here: <a href="http://blog.mekk.waw.pl/archives/14-Twisted-inlineCallbacks-and-deferredGenerator.html" rel="nofollow noreferrer">http://blog.mekk.waw.pl/archives/14-Twisted-inlineCallbacks-and-deferredGenerator.html</a></p> <p>You don't always have to get your bulk processing to integrate nicely with Twisted. Sometimes it is easier to break a large piece of your program off into a stand-alone, easily testable/tweakable/implementable command line tool and have Twisted invoke this tool in another process. Twisted's <code>ProcessProtocol</code> provides a fairly flexible way of launching and interacting with external helper programs. Furthermore, if you suddenly decide you want to <em>cloudify</em> your application, it is not all that big of a deal to use a <code>ProcessProtocol</code> to simply run your bulk processing on a remote server (random EC2 instances perhaps) via <code>ssh</code>, assuming you have the keys setup already.</p>

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