What is a set in Python?

A set is an unordered collection of unique items written inside curly braces { }. It has no index, and if you add a duplicate value, Python simply ignores it.

nums = {1, 2, 2, 3, 3}
print(nums)

a = {1, 2, 3}
b = {3, 4}
print(a | b)   # union
print(a & b)   # common items

Output:

Sets are useful to remove duplicates from data and to check membership quickly. To create an empty set use set(), because {} makes an empty dictionary. More in the Python Sets chapter.

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