Here are three functions using

Output

For more information on Python

`set`

s to remove duplicate entries from a list, find the intersection of two lists, and find the union of two lists. Note, `set`

s were introduced in Python 2.4, so Python 2.4 or later is required.def unique(a): """ return the list with duplicate elements removed """ return list(set(a)) def intersect(a, b): """ return the intersection of two lists """ return list(set(a) & set(b)) def union(a, b): """ return the union of two lists """ return list(set(a) | set(b)) if __name__ == "__main__": a = [1,2,3,4,3,2,1,0,9,8,7,6,5,4,3,1] b = [19,18,17,12,1,4,5,6,13,14,15,13,16,20] print unique(a) print unique(b) print intersect(a, b) print union(a, b)

Output

[0, 1, 2, 3, 4, 5, 6, 7, 8, 9] [1, 4, 5, 6, 12, 13, 14, 15, 16, 17, 18, 19, 20] [1, 4, 5, 6] [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 12, 13, 14, 15, 16, 17, 18, 19, 20]

For more information on Python

`set`

s, see the Library Reference.
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