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    <p>I'm not positive, but I'm using the <a href="http://docs.python.org/2/library/struct.html#struct.unpack" rel="nofollow">documentation</a> to take a stab at it.</p> <p>Looking at the docs, we're going to return a tuple based on the format string:</p> <blockquote> <p>Unpack the string (presumably packed by pack(fmt, ...)) according to the given format. The result is a tuple even if it contains exactly one item. The string must contain exactly the amount of data required by the format (len(string) must equal calcsize(fmt)).</p> </blockquote> <p>The item coming in (<code>b</code>) is <em>probably</em> a byte buffer (represented as a string) - looking at the examples they are represented the the <code>\x</code> escape, <a href="http://www.python.org/dev/peps/pep-0223/" rel="nofollow">which consumes</a> the next two characters as hex.</p> <p>It appears the format string is </p> <pre><code>'&gt;%dI' % (len(b) / 4) </code></pre> <p>The <code>%</code> and <code>%d</code> are going to put a number into the format string, so if the length of b is 32 the format string becomes</p> <pre><code>`&gt;8I` </code></pre> <p>The first part of the format string is <code>&gt;</code>, which the <a href="http://docs.python.org/2/library/struct.html#byte-order-size-and-alignment" rel="nofollow">documentation</a> says is setting the byte order to big-endian and size to standard.</p> <p>The <code>I</code> says it will be an unsigned int with size 4 (<a href="http://docs.python.org/2/library/struct.html#format-characters" rel="nofollow">docs</a>), and the 8 in front of it means it will be repeated 8 times.</p> <pre><code>&gt;IIIIIIII </code></pre> <hr> <p>So I think this is saying: take this byte buffer, make sure it's a multiple of 4 by appending as many <code>0x00</code>s as is necessary, then unpack that into a tuple with as many unsigned integers as there are blocks of 4 bytes in the buffer. </p>
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    1. COwhat he said :)
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    2. COWhat does "a32" stand for?
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    3. CO@Wojtek The `32` probably refers to the size of an integer (32 bits == 4 bytes). The `a` could just be saying you'll get "a 32" or it could mean something else in the context of the code you're working with.
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