Membership operators (in, not in) in Python - Mini Project: Build & Apply

Using Membership Operators (in, not in) in Python

📖 Scenario: You work at a library. You have a list of books currently available on the shelves. You want to check if certain books are in the library or not.

🎯 Goal: Build a small program that checks if some books are available in the library using membership operators in and not in.

📋 What You'll Learn

Create a list called library_books with exact book titles

Create a variable called check_book with a specific book title

Use in or not in to check if check_book is in library_books

Print the result as a sentence

💡 Why This Matters

🌍 Real World

Libraries, stores, and many apps need to check if an item is available in a collection before proceeding.

💼 Career

Understanding membership operators helps in filtering data, validating inputs, and controlling program flow in many programming jobs.

1

Create the list of books

Create a list called library_books with these exact book titles: 'The Hobbit', '1984', 'Pride and Prejudice', 'To Kill a Mockingbird', and 'The Great Gatsby'.

Python

# Create the list library_books with the given book titles
# Your code here

Need a hint?

Remember to use square brackets [] to create a list and separate items with commas.

2

Set the book to check

Create a variable called check_book and set it to the string '1984'.

Python

library_books = ['The Hobbit', '1984', 'Pride and Prejudice', 'To Kill a Mockingbird', 'The Great Gatsby']
# Create the variable check_book and set it to '1984'
# Your code here

Need a hint?

Use simple assignment with the exact string '1984'.

3

Check if the book is in the library

Use an if statement with the membership operator in to check if check_book is in library_books. Inside the if, create a variable called message and set it to "The book is available in the library.". In the else part, set message to "The book is not available in the library.".

Python

library_books = ['The Hobbit', '1984', 'Pride and Prejudice', 'To Kill a Mockingbird', 'The Great Gatsby']
check_book = '1984'
# Use if with 'in' to check if check_book is in library_books
# Set message accordingly
# Your code here

Need a hint?

Use if check_book in library_books: to check membership.

4

Print the result message

Print the variable message to show if the book is available or not.

Python

library_books = ['The Hobbit', '1984', 'Pride and Prejudice', 'To Kill a Mockingbird', 'The Great Gatsby']
check_book = '1984'
if check_book in library_books:
    message = "The book is available in the library."
else:
    message = "The book is not available in the library."
# Print the message
# Your code here

Need a hint?

Use print(message) to show the result.