Python: Find intersection and union of lists

Following program finds

a.   Unique elements in list

b.   Intersection of two lists

c.    Union of two lists.

test.py

def unique(a):
    return list(set(a))

def intersect(a, b):
    return list(set(a) & set(b))

def union(a, b):
    return list(set(a) | set(b))

if __name__ == "__main__": 
    a = [2, 4, 6, 8, 10, 10, 8, 6]
    b = [2, 4, 8, 16, 1, 3, 5, 2, 4]
    print(unique(a))
    print(intersect(a, b))
    print(union(a, b))

$ python3 test.py

[8, 2, 10, 4, 6]

[8, 2, 4]

[1, 2, 3, 4, 5, 6, 8, 10, 16]

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