optimization of list comprehensions

[Mats Cronqvist]

Robert Virding wrote:
> You will probably find an even grater usage if you start searching more 
> seriously.

   yes, it's by no means a serious study.

> I, for one, usually do an import on 'lists' so I don't have 
> to write the lists: prefix all the time.

   so do i. but i doubt accounting for -import(lists) would change the numbers 
significantly.

   mats