[Tutor] Best method for filtering lists in lists...
alan.gauld at btinternet.com
Sun Dec 17 01:00:54 CET 2006
"Roel Schroeven" <rschroev_nospam_ml at fastmail.fm> wrote
>> In that case put the inner lists in a Set. That will eliminate
> That won't work: list objects are unhashable so you can't put them
> in a
> set. You'll have to convert them to tuples first.
Hmm, I took that a self evident but I guess maybe it wasn't...
As for Luke's point about the speed of conversion, I'm not
sure how that would stack up. I have a gut feel that it might
be faster than trying to compare the lists element by
element, that sounds like an algebraic expansion with list
size to me, a hashed set sounds like it should be faster.
But as with all such things, if speed matters: measure
and profile it.
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