Why sets are used in Python - See It in Action

Why sets are used

📖 Scenario: Imagine you have a list of fruits you bought from the market, but some fruits are repeated. You want to find out which unique fruits you have without any duplicates.

🎯 Goal: Learn how to use a set in Python to find unique items from a list and understand why sets are useful.

📋 What You'll Learn

Create a list called fruits with some repeated fruit names

Create a set called unique_fruits from the fruits list

Print the unique_fruits set to see only unique fruit names

💡 Why This Matters

🌍 Real World

Sets help when you want to find unique things like unique customers, unique products, or unique words in a text.

💼 Career

Understanding sets is important for data cleaning, removing duplicates, and improving program efficiency in many programming jobs.

1

Create a list with repeated fruits

Create a list called fruits with these exact values: 'apple', 'banana', 'apple', 'orange', 'banana', 'grape'.

Python

# Create the list called fruits with repeated fruit names
# Your code here

Need a hint?

Use square brackets [] to create a list and separate items with commas.

2

Create a set from the list

Create a set called unique_fruits by converting the fruits list into a set using the set() function.

Python

fruits = ['apple', 'banana', 'apple', 'orange', 'banana', 'grape']
# Create a set called unique_fruits from the fruits list
# Your code here

Need a hint?

Use the set() function to remove duplicates from the list.

3

Print the unique fruits

Use print() to display the unique_fruits set so you can see the unique fruit names without duplicates.

Python

fruits = ['apple', 'banana', 'apple', 'orange', 'banana', 'grape']
unique_fruits = set(fruits)
# Print the unique_fruits set
# Your code here

Need a hint?

Use print() to show the contents of the set.

4

Understand the output

Run the program and observe the output. Notice that the printed set shows only unique fruit names without any repeats.

Python

fruits = ['apple', 'banana', 'apple', 'orange', 'banana', 'grape']
unique_fruits = set(fruits)
print(unique_fruits)
# Run the code and see the unique fruits printed

Need a hint?

The order of items in a set can vary, but all items will be unique.