>>> a=range(5)
>>> a.reverse()
>>> a
[4, 3, 2, 1, 0]
Y si queremos ser un poco más rebuscados, podemos usar list comprehension
>>> a=range(5)
>>> a
[0, 1, 2, 3, 4]
>>> [a[i] for i in range(len(a)-1,-1,-1)]
[4, 3, 2, 1, 0]
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>>> a=range(5)
>>> a.reverse()
>>> a
[4, 3, 2, 1, 0]
>>> a=range(5)
>>> a
[0, 1, 2, 3, 4]
>>> [a[i] for i in range(len(a)-1,-1,-1)]
[4, 3, 2, 1, 0]