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    <p>You seem to have three questions:</p> <ol> <li><p>"What does <code>lambda</code> mean in Python?"</p> <p>Which is <a href="http://docs.python.org/reference/expressions.html#lambda" rel="nofollow">covered by Python's documentation</a>. If you still have a hard time reading code written this way though, you can use the fact that <code>lambda x: y</code> is just a shortcut to writing <code>def my_function(x): return y</code>. Anywhere you see a <code>lambda</code>, like for example, this:</p> <pre><code>def foo(bar): return boz().addCallback(lambda result: qux(bar, result)) </code></pre> <p>you can always pull out the <code>lambda</code> into its own function so that it's easier for you to read, like this:</p> <pre><code>def foo(bar): def callback_for_boz(result): return qux(bar, result) return boz().addCallback(callback_for_boz) </code></pre></li> <li><p>"<a href="http://twistedmatrix.com/trac/wiki/FrequentlyAskedQuestions#HowdoImakeinputononeconnectionresultinoutputonanother" rel="nofollow">How do I make input on one connection result in output on another?</a>"</p> <p>Which is <a href="http://twistedmatrix.com/trac/wiki/FrequentlyAskedQuestions#HowdoImakeinputononeconnectionresultinoutputonanother" rel="nofollow">documented by Twisted's FAQ</a>. </p></li> <li><p>"<a href="http://twistedmatrix.com/trac/wiki/FrequentlyAskedQuestions#HowdoImakeTwistedtalktomultipleclientsconnecttomultipleservers" rel="nofollow">How do I make Twisted talk to multiple clients / connect to multiple servers?</a>"</p> <p>Which is <a href="http://twistedmatrix.com/trac/wiki/FrequentlyAskedQuestions#HowdoImakeTwistedtalktomultipleclientsconnecttomultipleservers" rel="nofollow">also a twisted FAQ</a>. The general idea here is that <code>reactor.run()</code> means "... and then run the whole program". The only reason you run any code before <code>reactor.run()</code> is to set up your initial timers, or listening sockets, or your first connection. You can call <code>connectTCP</code> or <code>listenTCP</code> as many times as you like, either before you run the reactor or in any callback that happens later in your program.</p></li> </ol>
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    1. COThank you for the FAQ links, I've stumbled upon #2 but not #3 since posting, and I shall study them well. For your remarks on #3, should I then consider it bad style to wrap `reactor.run()` in a separate thread, interacting with the twisted functions via Queues or the like?
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    2. COI'd hesitate to call that "bad" style, since it depends what your requirements are, but all things being equal it's usually better to use Twisted "natively", and run `reactor.run` once on the main thread. Running it on a non-main thread breaks subprocess spawning, opens you up to all kinds of nightmarish signal/thread interactions when you want to shut down, and is generally a headache which you should have a good reason for dealing with. Also, you can't use a `Queue` to interact with Twisted in this way: use `reactor.callInThread`/`callfromThread`.
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    3. COIf you think this answers your question, by the way, you should "accept" the answer (the big green check mark).
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