M. Hamed wrote:
I'm trying the following statements that I found here and there on
Google, but none of them works on my Python 2.5, are they too old? or
newer?

"abc".reverse()

Lists have a .reverse() method which reverses the list elements
in-place, but strings don't because they're immutable.

There's a built-in function reversed() which returns an iterator over an
iterable object, eg a string:

    print reversed("abc")

    for c in reversed("abc"):
        print c

It's all in the documentation.

import numpy

numpy isn't part of the standard library; you'd need to download and
install it.

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