Sets in Python

Need to keep one copy of each value? Sets are built for exactly that. This Block introduces Python sets through practical examples: removing duplicates, checking whether a value has already appeared, and combining groups without extra copies.

What you will learn

• Create sets with curly braces and set()
• Remove duplicate values from another collection
• Understand why sets are unordered and do not use indexes
• Check membership with in and not in
• Add and remove items with add(), remove(), and discard()
• Find shared items with intersections and combine unique items with unions

You will also compare sets with lists, tuples, and dictionaries, so you can choose the collection that matches the job. By the end, you will be ready to use sets for clear, beginner-friendly uniqueness and membership tasks.