[Tutor] help with slice

Andreas Kostyrka andreas at kostyrka.org
Tue Mar 4 23:28:53 CET 2008

What you probably want is:

[elem_list[2] for elem_list in List]

If you are not sure that the list have at least three elements, you can
use something like this:

[(elem_list + [None, None, None])[2] for elem_list in List]

Which will use None as a default value.


Am Dienstag, den 04.03.2008, 14:03 -0800 schrieb washakie:
> Could someone please explain 'slices' also for dictionaries?
> basically, I'd like to know how you would call every 3rd element in a list
> of lists... 
> My logic says: ThirdElems=List[:][2]
> Which to me reads, for every item in List (which are lists), return the
> third item.
> but this doesn't work.
> Thanks!
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