## Fix Python – How to find list intersection?

a = [1,2,3,4,5]

b = [1,3,5,6]

c = a and b

print c

actual output: [1,3,5,6]

expected output: [1,3,5]

How can we achieve a boolean AND operation (list intersection) on two lists?

….

a = [1,2,3,4,5]

b = [1,3,5,6]

c = a and b

print c

actual output: [1,3,5,6]

expected output: [1,3,5]

How can we achieve a boolean AND operation (list intersection) on two lists?

….

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

def intersect(a, b):

return list(set(a) & set(b))

print intersect(b1, b2)

But when I have to find intersection for nested lists then my problems starts:

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

c2 = [[13….

How do I get a new list without duplicates?

[1, 2, 3, 1] → [1, 2, 3]

How do I get a new list where items that are duplicated are entirely removed?

[1, 2, 3, 1] → [2, 3]

….