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2013-04-21T22:33:46.060
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<code>xrange</code> is a Python function that, unlike the traditional <code>range</code> function, creates an iterator object rather than a list. Their behaviors are very similar, but behind the scenes it's different. <code>range</code> returns a list: <pre><code>>>> range(10) [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] >>> range(10).__class__ <type 'list'> >>> for i in range(10): ... print i, 0 1 2 3 4 5 6 7 8 9 </code></pre> <code>xrange</code> returns an iterable object: <pre><code>>>> xrange(10) xrange(10) >>> xrange(10).__class__ #It's not a list, it's a class of its own. <type 'xrange'> >>> for i in xrange(10): #However, it can still be iterated over. ... print i, 0 1 2 3 4 5 6 7 8 9 </code></pre> While they behave basically the same, <code>xrange</code> works differently. <code>range</code> generates a list and then returns it. <code>xrange</code>, typically used for low-memory systems or very large ranges, generates the numbers one at a time, once on each iteration rather than all at once before the loop. Questions that include this tag should be related to <code>xrange</code>, not just code that happens to include it. Here are some relevant questions: <ul> <li><a href="http://stackoverflow.com/questions/94935/what-is-the-difference-between-range-and-xrange">What is the difference between range and xrange?</a></li> <li><a href="http://stackoverflow.com/questions/15409752/strange-xrange-behavior-in-python-2">strange xrange() behavior in Python 2</a></li> </ul> Relevant links: <ul> <li><a href="http://docs.python.org/2/library/functions.html#xrange" rel="nofollow">Python docs</a></li> <li><a href="http://stackoverflow.com/questions/135041/should-you-always-favor-xrange-over-range">Should you always favor xrange() over range()?</a></li> </ul>
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