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2012-09-28T19:05:18.963
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Using a List data structure isn't an efficient way to do this. A Queue would be more appropriate. In any case: Using a Queue As I suggested, using a Queue (<a href="http://docs.python.org/library/collections.html#collections.deque" rel="nofollow">collections.deque</a>): <pre><code>>>> q = collections.deque([1,2,3,4,5,6,7,8]) >>> for _ in xrange(5): ... q.rotate(-1) ... >>> q deque([6, 7, 8, 1, 2, 3, 4, 5]) </code></pre> Keeping the List <pre><code>>>> a = [1,2,3,4,5,6,7,8] >>> for _ in xrange(5): ... a = a[1:] + a[:1] ... >>> a [6, 7, 8, 1, 2, 3, 4, 5] </code></pre> Alternatively (faster than the previous one): <pre><code>>>> a = [1,2,3,4,5,6,7,8] >>> for _ in xrange(5): ... a.append(a.pop(0)) ... >>> a [6, 7, 8, 1, 2, 3, 4, 5] </code></pre> Here you can change xrange for whatever you want to iterate over. Timeit analysis: Pop-Append <pre><code>>>> timeit.timeit('a.append(a.pop(0))', setup='a = [0,1,2,3,4,5,6,7,8,9]', number=1000000) 0.24548697471618652 >>> timeit.timeit('a.append(a.pop(0))', setup='a = [0,1,2,3,4,5,6,7,8,9]', number=100000000) 23.65538215637207 </code></pre> Slicing <pre><code>>>> timeit.timeit('a=a[1:] + a[:1]', setup='a = [0,1,2,3,4,5,6,7,8,9]', number=1000000) 0.36037278175354004 >>> timeit.timeit('a=a[1:] + a[:1]', setup='a = [0,1,2,3,4,5,6,7,8,9]', number=100000000) 35.06173801422119 </code></pre> Queue <pre><code>>>> timeit.timeit('q.rotate(-1)', setup='import collections; q = collections.deque([0,1,2,3,4,5,6,7,8])', number=1000000) 0.16829514503479004 >>> timeit.timeit('q.rotate(-1)', setup='import collections; q = collections.deque([0,1,2,3,4,5,6,7,8])', number=100000000) 16.012277841567993 </code></pre> With a little optimization, basically removing the __getattr__ call for append, pop and rotate: Pop-Append <pre><code>>>> timeit.timeit('aa(ap(0))', setup='a = [0,1,2,3,4,5,6,7,8,9]; aa=a.append; ap=a.pop', number=1000000) 0.15255093574523926 >>> timeit.timeit('aa(ap(0))', setup='a = [0,1,2,3,4,5,6,7,8,9]; aa=a.append; ap=a.pop', number=100000000) 14.50795292854309 </code></pre> Queue <pre><code>>>> timeit.timeit('r(-1)', setup='import collections; q = collections.deque([0,1,2,3,4,5,6,7,8]); r=q.rotate', number=1000000) 0.13374090194702148 >>> timeit.timeit('r(-1)', setup='import collections; q = collections.deque([0,1,2,3,4,5,6,7,8]); r=q.rotate', number=100000000) 11.435136079788208 </code></pre>
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