Dictionary creation in Python - Mini Project: Build & Apply

Dictionary Creation

📖 Scenario: You are organizing a small library. You want to keep track of some books and their page counts.

🎯 Goal: Create a dictionary to store book titles as keys and their page counts as values. Then display the dictionary.

📋 What You'll Learn

Create a dictionary called books with exact entries

Add a new book entry count variable

Use dictionary comprehension to create a new dictionary with only books having more than 300 pages

Print the new filtered dictionary

💡 Why This Matters

🌍 Real World

Libraries, bookstores, and reading apps often use dictionaries to store book information and filter books based on user preferences.

💼 Career

Understanding dictionary creation and filtering is essential for data handling tasks in programming jobs like data analysis, web development, and software engineering.

1

Create the initial dictionary

Create a dictionary called books with these exact entries: 'Python Basics': 250, 'Data Science': 320, 'Machine Learning': 400, 'Deep Learning': 500

Python

# Create the dictionary called books with the given entries
# Your code here

Need a hint?

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

2

Add a page count threshold

Create a variable called min_pages and set it to 300 to use as a filter for books with more pages.

Python

books = {'Python Basics': 250, 'Data Science': 320, 'Machine Learning': 400, 'Deep Learning': 500}
# Create min_pages variable and set it to 300
# Your code here

Need a hint?

Just assign the number 300 to the variable min_pages.

3

Filter books with dictionary comprehension

Use dictionary comprehension to create a new dictionary called long_books that contains only books from books with page counts greater than min_pages. Use for title, pages in books.items() in your comprehension.

Python

books = {'Python Basics': 250, 'Data Science': 320, 'Machine Learning': 400, 'Deep Learning': 500}
min_pages = 300
# Create long_books dictionary with books having pages > min_pages
# Your code here

Need a hint?

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

4

Display the filtered dictionary

Print the long_books dictionary to show only books with more than 300 pages.

Python

books = {'Python Basics': 250, 'Data Science': 320, 'Machine Learning': 400, 'Deep Learning': 500}
min_pages = 300
long_books = {title: pages for title, pages in books.items() if pages > min_pages}
# Print the long_books dictionary
# Your code here

Need a hint?

Use print(long_books) to display the dictionary.