Sets

What You’ll Learn

You’ll learn how to use sets to store unique items.

What is a Set?

A set is a collection which is unordered, unchangeable (though you can add/remove items), and unindexed. Sets are written with curly brackets {}.

Sets cannot have two items with the same value.

fruits = {"apple", "banana", "cherry", "apple"}
print(fruits)

Expected Output:

{'banana', 'cherry', 'apple'}

(Notice the duplicate ‘apple’ was ignored, and the order might change!)

Accessing Items

Since sets are unordered, they don’t have indexes. You cannot do fruits[0]. You must loop through them or check if an item exists using in.

fruits = {"apple", "banana", "cherry"}

print("banana" in fruits) # True

Adding and Removing

fruits.add("orange")
fruits.remove("apple")