Why list comprehension is used in Python - See It in Action

Why list comprehension is used

📖 Scenario: Imagine you have a list of numbers and you want to create a new list with each number doubled. Doing this one by one can take many lines of code. List comprehension helps you do this quickly and clearly.

🎯 Goal: Learn how to use list comprehension to create a new list by doubling each number from an existing list.

📋 What You'll Learn

Create a list called numbers with the values 1, 2, 3, 4, 5

Create a new list called doubled using list comprehension to double each number in numbers

Print the doubled list

💡 Why This Matters

🌍 Real World

List comprehension is used in data processing, like quickly transforming lists of data without writing long loops.

💼 Career

Knowing list comprehension helps you write clean and efficient code, a skill valued in programming jobs.

1

Create the initial list of numbers

Create a list called numbers with these exact values: 1, 2, 3, 4, 5

Python

# Create the list called numbers with values 1, 2, 3, 4, 5
# Your code here

Need a hint?

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

2

Prepare to create the doubled list

Create an empty list called doubled to hold the doubled numbers

Python

numbers = [1, 2, 3, 4, 5]
# Create an empty list called doubled
# Your code here

Need a hint?

Use [] to create an empty list.

3

Use list comprehension to double each number

Use list comprehension to create a new list called doubled that contains each number in numbers multiplied by 2

Python

numbers = [1, 2, 3, 4, 5]
doubled = []
# Use list comprehension to fill doubled with numbers multiplied by 2
# Your code here

Need a hint?

Use the format [expression for item in list] to create the new list.

4

Print the doubled list

Print the list doubled to see the result

Python

numbers = [1, 2, 3, 4, 5]
doubled = [number * 2 for number in numbers]
# Print the doubled list
# Your code here

Need a hint?

Use print(doubled) to show the list.