Basic dictionary comprehension in Python - Mini Project: Build & Apply

Basic dictionary comprehension

📖 Scenario: You work in a small bookstore. You have a list of books with their prices. You want to create a new dictionary that shows the prices after a discount.

🎯 Goal: Create a dictionary using dictionary comprehension to apply a discount to each book price.

📋 What You'll Learn

Create a dictionary called books with given book titles and prices.

Create a variable called discount to hold the discount rate.

Use dictionary comprehension to create a new dictionary called discounted_books with discounted prices.

Print the discounted_books dictionary.

💡 Why This Matters

🌍 Real World

Applying discounts to product prices is common in stores and online shops.

💼 Career

Understanding dictionary comprehension helps in data processing and automation tasks in many programming jobs.

1

Create the initial dictionary of books

Create a dictionary called books with these exact entries: 'Python Basics': 40, 'Data Science': 50, 'Machine Learning': 60

Python

# Create the books dictionary with exact titles and prices
# Your code here

Need a hint?

Use curly braces {} to create a dictionary with keys and values separated by colons.

2

Set the discount rate

Create a variable called discount and set it to 0.1 to represent a 10% discount

Python

books = {'Python Basics': 40, 'Data Science': 50, 'Machine Learning': 60}
# Create a discount variable with value 0.1
# Your code here

Need a hint?

Just assign the number 0.1 to the variable discount.

3

Create discounted prices with dictionary comprehension

Use dictionary comprehension to create a new dictionary called discounted_books where each price is reduced by the discount. Use for title, price in books.items() in the comprehension

Python

books = {'Python Basics': 40, 'Data Science': 50, 'Machine Learning': 60}
discount = 0.1
# Create discounted_books using dictionary comprehension
# Your code here

Need a hint?

Use the format {key: value_expression for key, value in dictionary.items()}.

4

Print the discounted books dictionary

Write print(discounted_books) to display the dictionary with discounted prices

Python

books = {'Python Basics': 40, 'Data Science': 50, 'Machine Learning': 60}
discount = 0.1
discounted_books = {title: price * (1 - discount) for title, price in books.items()}
# Print the discounted_books dictionary
# Your code here

Need a hint?

Use the print function to show the dictionary.