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    <p>In the context you are asking about the <code>%</code> is used to help format output, and has nothing to do with any mod operation.</p> <p>For instance, <code>%3d</code>, <code>%.2f</code> are all different ways to format output. The first example means you want to display an integer and reserve 3 spaces for it. The 2nd one means you want to display a float type value with 2 numbers after the decimal point.</p> <p>See<code>String Formatting Operations</code> in <a href="http://docs.python.org/library/stdtypes.html#string-formatting-operations" rel="nofollow">http://docs.python.org/library/stdtypes.html#string-formatting-operations</a> for more information and details about the various formatting types and options.</p> <p>You may come across something like this:</p> <pre><code>number_of_Widgets = 5 cost = 66.8788 print 'Total cost for %d widgets is $ %5.2f.' % (number_of_Widgets, cost) </code></pre> <p>yields:</p> <pre><code>Total cost for 5 widgets is $ 66.88. </code></pre> <p>The part enclosed in ' ' uses formatting instructions as place holders for the actual variable values supplied in toward the end of the line. The values are preceded by the % and then the () contain the variables that supply the values.</p> <p>Here is a simple example as to why the format strings can come in handy for formatting your output:</p> <p>Here we don't reserve and additional space for the number and you can see it shifting the output when it reaches 10.</p> <pre><code>In [9]: for i in xrange(5,15): ...: print '%d is the number' % i ...: 5 is the number 6 is the number 7 is the number 8 is the number 9 is the number 10 is the number 11 is the number 12 is the number 13 is the number 14 is the number </code></pre> <p>Here we format the number with two spaces, and get a leading blank space for single digit numbers.</p> <pre><code>In [10]: for i in xrange(5,15): ....: print '%2d is the number' % i ....: 5 is the number 6 is the number 7 is the number 8 is the number 9 is the number 10 is the number 11 is the number 12 is the number 13 is the number 14 is the number </code></pre>
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    1. COThis is the type of answer I was looking for. Thank you very much for this detailed answer.
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