indexing lists/arrays question

[Tim Chase]

On 05/13/2010 09:36 AM, a wrote:
> this must be easy but its taken me a couple of hours already
>
> i have
>
> a=[2,3,3,4,5,6]
>
> i want to know the indices where a==3 (ie 1 and 2)

indexes = [i for (i, v) in enumerate(a) where v==3]

> then i want to reference these in a

In a _what_?  You can then do things like

   for i in indexes:
     print a[i]

(but you already know these are "3", so it's not very exciting...)

-tkc