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.

-- 
Janos Blazi


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