Lambda with map() in Python - Mini Project: Build & Apply

Using Lambda with map() to Square Numbers

📖 Scenario: Imagine you have a list of numbers representing the ages of children in a class. You want to find the square of each age to understand how their growth might be represented in a fun math exercise.

🎯 Goal: You will create a list of ages, then use a lambda function with map() to calculate the square of each age, and finally print the list of squared ages.

📋 What You'll Learn

Create a list called ages with the exact values: 5, 7, 9, 10, 12

Create a lambda function inside map() that squares each number

Convert the result of map() to a list called squared_ages

Print the squared_ages list

💡 Why This Matters

🌍 Real World

Using lambda with map() helps quickly apply simple changes to lists of data, like adjusting prices, converting units, or processing user inputs.

💼 Career

Many programming jobs require processing lists of data efficiently. Knowing how to use lambda with map() is a handy skill for data cleaning, transformation, and automation.

1

Create the list of ages

Create a list called ages with these exact values: 5, 7, 9, 10, 12

Python

# Create the list of ages
# Your code here

Need a hint?

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

2

Set up the lambda with map()

Create a variable called squared_ages that uses map() with a lambda function to square each number in the ages list

Python

ages = [5, 7, 9, 10, 12]
# Use map() with a lambda to square each age and assign to squared_ages
# Your code here

Need a hint?

The lambda function takes one input x and returns x * x. Use list() to convert the map object to a list.

3

Print the squared ages

Write a print() statement to display the squared_ages list

Python

ages = [5, 7, 9, 10, 12]
squared_ages = list(map(lambda x: x * x, ages))
# Print the squared_ages list
# Your code here

Need a hint?

Use print(squared_ages) to show the list of squared numbers.

4

Explain the output

Add a print() statement that prints the text "Squared ages:" followed by the squared_ages list using an f-string

Python

ages = [5, 7, 9, 10, 12]
squared_ages = list(map(lambda x: x * x, ages))
print(squared_ages)
# Print the text "Squared ages:" followed by the squared_ages list using an f-string
# Your code here

Need a hint?

Use print(f"Squared ages: {squared_ages}") to combine text and the list in one line.