I just wanted to throw in a couple of ideas for you on this subject. These are the ways I would personally think of going about this problem:
>>> ''.join([s[n] for n in range(len(s)-1, -1, -1)])
'rac'
Which looks a bit fugly but is nice and short if you can manage list comps.
and now my favourite:
>>> l = list("car")
>>> l.reverse()
>>> ''.join(l)
'rac'
hth
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