Set

numbers = set([1, 2, 2, 3])

Square brackets [] in above example are just creating a list before converting it into a set.

Role of Square Brackets

• [1, 2, 2, 3] → this is a list literal in Python.

• Lists can contain duplicates and preserve order.

• Then set([...]) takes that list and removes duplicates, giving {1, 2, 3}.

So the square brackets are not part of the set itself — they’re simply defining the list that you pass into set().

Microsoft Copilot