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    <p>Some people, when confronted with a problem, think "I know, I'll use <a href="http://docs.python.org/3/library/itertools.html" rel="nofollow noreferrer">itertools</a>."</p> <p>Now they have <code>next(takewhile(not_, count()))</code> problems.</p> <hr> <p>Since I've been asked about this multiple times now:</p> <p>It's a reference to <a href="http://www.codinghorror.com/blog/2008/06/regular-expressions-now-you-have-two-problems.html" rel="nofollow noreferrer">"Now they have two problems"</a> about regular expressions. <code>next(takewhile(not_, count()))</code> is guaranteed to give you <code>0</code>, and pretty efficiently… but it's not exactly readable. Which is the joke. <code>itertools</code> <em>does</em> solve all your problems, but you don't <em>always</em> need to use it.</p> <p>If you don't grasp the paradigm, go read <a href="http://www.dabeaz.com/generators-uk/" rel="nofollow noreferrer">David Beazley's presentations</a>. Once you do: "I've got a CSV, and I want to group the rows by…" Pass a <code>csv.reader</code> to <code>groupby</code>. "I've got a bunch of values, and I want to take them 4 at a time and…" Use <code>grouper</code> from the recipes. "I've got a file, and I want to take each pair of adjacent lines and…" <code>tee</code> it, <code>next</code> one copy, and <code>zip</code> them. And so on.</p> <p>But of course some problems have an even <em>easier</em> solution, and once you start thinking in terms of sequences of transformations on iterators, sometimes you'll miss the easier answer.</p> <p>(The exact same thing happens with <code>numpy</code>, of course.)</p>
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    3. POHow can I parse the first JSON object on a stream in JS
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    1. CO@ildjam (and Chad) Actually, O(N) and O(N log(2)) are identical, because log(2) is a constant. Of course when we're dealing with a problem where 20 is considered a large value for N, algorithmic complexity isn't all that relevant. If performance matters at all, profiling on the target machine is the only thing that's going to give you a relevant answer. So, I'd start with std::partial_sort (because it's simple, well-defined, and already written and tested), and see whether it's fast enough.
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    2. COHold on, are you sure this is what you want? If you put in KADERZ, it's going to show the screen and fail, which I don't think is what you intended. If you really want to do it this way, see Matt's answer below. But omz's answer (using NSSet) is probably the best.
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    3. COSince GNU Emacs 24 isn't actually out yet, you're clearly using either a custom build—in which case you ought to know how you configured it—or some derived product like Aquamacs—in which case we'd need to know which one you're using before anyone can answer.
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      1. POWhere can I find the source for "python mode" when editing emacs configuration for mac os x?
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