How to select items from a list?

There are 10 items in the list l.

list l = [4,8,3,9,2,15,17,19,34,1]

I want to select 70% items (in this case, 7) randomly from the list l, save into another list l1 and the rest left out items which will be 30% (in this case, 3) and save into another list l2.

I can select 70% random items like this but how to select the rest 30%? List l1 and l2 should not have overlapped items.

import random
l1 = random.sample(l, int(.7*len(l)))
l2 = ??

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