quick beginners List comprehension question

[Lou Pecora]

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.
> 
> HTH
> Philip


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

   A=[1,2,3]
   print A
   A=[2*a for a in A]
   print A

-- 
-- Lou Pecora