A Python sort trick

By chys on October 23rd, 2009 
>>> a = [12,14,133,130,176,25,54,79,127]
>>> b = sorted(range(len(a)),key=a.__getitem__)
>>> b
[0, 1, 5, 6, 7, 8, 3, 2, 4]
>>> map(a.__getitem__,b)
[12, 14, 25, 54, 79, 127, 130, 133, 176]

b is the so called sort index.

Reference
http://www.newsmth.net/bbscon.php?bid=284&id=59819

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