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## version 1.1, changed according to the suggestions in the comments            from twisted.internet import reactor, defer            from twisted.python import threadable; threadable.init(1)            import sys, time            ## the wrong way            def callInThread(func, *args):            """Takes a blocking function an converts it into a deferred-valued            function running in a separate thread.            """            de = defer.Deferred()            de.addCallback(func)            reactor.callInThread(de.callback, *args)            return de            deferred = callInThread.__get__ # decorator associated to callInThread            # the right way            from twisted.internet.threads import deferToThread            deferred = deferToThread.__get__            ## example code            def print_(result):            print result            def running():            "Prints a few dots on stdout while the reactor is running."            sys.stdout.write("."); sys.stdout.flush()            reactor.callLater(.1, running)            @deferred            def sleep(sec):            "A blocking function magically converted in a non-blocking one."            print ‘start sleep %s‘ % sec            time.sleep(sec)            print ‘\nend sleep %s‘ % sec            return "ok"            if __name__ == "__main__":            sleep(2).addBoth(print_)            reactor.callLater(.1, running)            reactor.callLater(3, reactor.stop)            reactor.run()

Discussion:

How to make blocking code non-blocking is the obvious question for
everybody using Twisted, but the Twisted documentation does not make
easy to find the solution :-(

The trick is to run the blocking function in a separate thread. Here
all the magic is performed by the decorator, ``deferred``, which converts
``sleep``, a blocking function, into a deferred function i.e. a
non-blocking function that returns a deferred object. The code for
``callInThread`` is clear, and the ``.__get__`` trick converts
``callInThread`` in a one-argument function returning a closure,
i.e. an object suitable to be used as a decorator. I have seen this
trick in Alex Martelli‘s lectures at PyCon 2005. If you are confused
by it, you should read Raymond Hettinger essay on descriptors
(http://users.rcn.com/python/download/Descriptor.htm).

In short: every time you have a blocking function in your code, wrap
it with the ``deferred`` decorator and live happy!