Basic list comprehension syntax in Python - Mini Project: Build & Apply

Basic List Comprehension Syntax

📖 Scenario: You work in a small bakery that keeps track of daily sales in a list. You want to quickly create a new list showing the prices with tax added.

🎯 Goal: Build a Python program that uses list comprehension to add tax to each price in a list.

📋 What You'll Learn

Create a list of prices

Create a tax rate variable

Use list comprehension to add tax to each price

Print the new list with prices including tax

💡 Why This Matters

🌍 Real World

Adding tax or fees to prices is common in stores and online shops.

💼 Career

Understanding list comprehension helps you write clean, fast code for data processing tasks.

1

Create the list of prices

Create a list called prices with these exact values: 2.5, 3.0, 4.75, 1.25, 5.0

Python

# Create the list called prices with the given values
# Your code here

Need a hint?

Use square brackets and separate numbers with commas.

2

Create the tax rate variable

Create a variable called tax_rate and set it to 0.08 (which means 8% tax).

Python

prices = [2.5, 3.0, 4.75, 1.25, 5.0]
# Create the tax_rate variable and set it to 0.08
# Your code here

Need a hint?

Just assign 0.08 to tax_rate.

3

Use list comprehension to add tax

Create a new list called prices_with_tax using list comprehension. For each price in prices, calculate price * (1 + tax_rate).

Python

prices = [2.5, 3.0, 4.75, 1.25, 5.0]
tax_rate = 0.08
# Create prices_with_tax list using list comprehension
# Your code here

Need a hint?

Use the syntax: [expression for item in list]

4

Print the new list

Write a print statement to display the prices_with_tax list.

Python

prices = [2.5, 3.0, 4.75, 1.25, 5.0]
tax_rate = 0.08
prices_with_tax = [price * (1 + tax_rate) for price in prices]
# Print the prices_with_tax list
# Your code here

Need a hint?

Use print(prices_with_tax) to show the list.