quick beginners List comprehension question

Lou Pecora pecora at anvil.nrl.navy.mil
Wed Jan 21 17:52:42 CET 2009

In article <mailman.7691.1232554737.3487.python-list at python.org>,
 Philip Semanchuk <philip at semanchuk.com> wrote:

> Other answers have been good; to them I'll add the comment that list  
> comprehensions are for *constructing* lists, not manipulating the  
> elements thereof.
> Philip

Well this seems to work just fine.  What am I missing:

   print A
   A=[2*a for a in A]
   print A

-- Lou Pecora

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