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You're already doing it... sort of. Your problem here is that <code>time.sleep()</code> is a blocking call, and will therefore make your whole server stop. If you're using that as a stand-in for something that does network I/O (like <code>urllib</code>), the best option is usually to do the I/O with Twisted (like <code>twisted.web.client.getPage</code>) rather than to try to do something to the blocking code. Twisted has lots of client libraries. These libraries will generally give you a <code>Deferred</code>, which you're already handling. If you're using it as a stand-in for actually waiting, then you can create a <code>Deferred</code> which waits with <a href="http://twistedmatrix.com/documents/11.0.0/api/twisted.internet.task.deferLater.html" rel="nofollow"><code>deferLater</code></a>. If you're using it as a stand-in for something CPU intensive that doesn't grab the GIL (like PIL image encoding, or a native XML parser), or an existing native / proprietary I/O layer (like Oracle or MSSQL database bindings) that you'd prefer not to rewrite to use Twisted properly, you can invoke it with <a href="http://twistedmatrix.com/documents/11.0.0/api/twisted.internet.threads.deferToThread.html" rel="nofollow"><code>deferToThread</code></a>. However you get your <code>Deferred</code>, you're almost set up to handle it. You just need to adjust <code>say_hi</code> to return one: <pre><code>def say_hi(self, req): req.setHeader("content-type", "text/html") d = getADeferredSomehow() def done(result): req.write("hello!") req.finish() return d.addBoth(done) </code></pre>
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1. COThanks for the answer. time.sleep is just a stub for blocking call. I tried to emulate call of blocking lib(like lots of libs in python) and to learn how can I write non-blocking app.
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