Find intersection of two nested lists?

Question

I know how to get an intersection of two flat lists:

b1 = [1,2,3,4,5,9,11,15]
b2 = [4,5,6,7,8]
b3 = [val for val in b1 if val in b2]

or

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Answer 1

Given:

> c1 = [1, 6, 7, 10, 13, 28, 32, 41, 58, 63]

> c2 = [[13, 17, 18, 21, 32], [7, 11, 13, 14, 28], [1, 5, 6, 8, 15, 16]]

I find the following code works well and maybe more concise if using set operation:

> c3 = [list(set(f)&set(c1)) for f in c2] 

It got:

> [[32, 13], [28, 13, 7], [1, 6]]

If order needed:

> c3 = [sorted(list(set(f)&set(c1))) for f in c2] 

we got:

> [[13, 32], [7, 13, 28], [1, 6]]

By the way, for a more python style, this one is fine too:

> c3 = [ [i for i in set(f) if i in c1] for f in c2]