Set

Set is a mutable unordered data type. Set always contains only unique elements. Set in Python is a sequence of elements that are separated by a comma and placed in curly braces.

Set can easily remove repetitive elements:

In [1]: vlans = [10, 20, 30, 40, 100, 10]

In [2]: set(vlans)
Out[2]: {10, 20, 30, 40, 100}

In [3]: set1 = set(vlans)

In [4]: print(set1)
{40, 100, 10, 20, 30}