JB wrote:

>  Bengt Richter wrote:
>  
>  Your idea sound very clever. I always make the mistake of
>  describing my problem too abstractly. So following your
>  idea with the None placeholders, I simply travel through
>  list1. If an entry is celected by f, I copy it into list2,
>  otherwise I do not. At the same time I maintain a counter
>  for each lists for counting the entries that are not None.
>  

Well, this will not work. Following this logic, I could use 
one list and have an extra attribut. This is not what I 
need, but thank you anyway.

-- 
Janos Blazi


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