An alternative way of doing this (if you have python 2.4):
>>> ppl = ['john', 'mary', 'lary', 'jane']
>>> age = [15, 30, 23, 25]
>>> height= [160, 165, 178, 170]
>>> sortby = lambda a, b: [a[b.index(x)] for x in sorted(b)]
>>> sortby(ppl, age)
['john', 'lary', 'jane', 'mary']
>>> sortby(ppl, height)
['john', 'mary', 'jane', 'lary']
>>> age # age is not changed
[15, 30, 23, 25]
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