Why these don't work??

[MRAB]

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.