I have a list I filter using another list and I would like this to be
as fast as possible
right now I do like this:
[x for x in list1 if x not in list2]
i tried using the method filter:
filter(lambda x: x not in list2, list1)
but it didn't make much difference, because of lambda I guess
is ther
Thanks all, sets work like i charm
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comparing
[x for x in list1 if x not in list2]
with
set1, set2 = set(list1), set(list2)
list(set1-set2)
gives something like
len(list2) speedup
--
10010
1000 100
11000
the speedup is constant for different len(list1)
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