Why pagination manages large datasets in Rest API - See It in Action

Why Pagination Manages Large Datasets

📖 Scenario: Imagine you have a huge list of books in an online library. Showing all books at once can be slow and hard to use. Pagination helps by showing only a few books at a time.

🎯 Goal: You will create a simple example to show how pagination works by dividing a large list of items into smaller pages.

📋 What You'll Learn

Create a list called books with 20 book titles as strings

Create a variable called page_size set to 5

Create a variable called page_number set to 2

Use slicing to get the books for the current page into a variable called current_page_books

Print the current_page_books list

💡 Why This Matters

🌍 Real World

Pagination is used in websites and apps to load data in small parts, making pages faster and easier to use.

💼 Career

Understanding pagination is important for backend and frontend developers working with APIs and user interfaces that handle large amounts of data.

1

Create the list of books

Create a list called books with these exact 20 book titles as strings: 'Book 1', 'Book 2', 'Book 3', 'Book 4', 'Book 5', 'Book 6', 'Book 7', 'Book 8', 'Book 9', 'Book 10', 'Book 11', 'Book 12', 'Book 13', 'Book 14', 'Book 15', 'Book 16', 'Book 17', 'Book 18', 'Book 19', 'Book 20'.

Rest API

# Create the list of books
# Your code here

Need a hint?

Use square brackets [] to create a list and put each book title as a string inside.

2

Set page size and page number

Create a variable called page_size and set it to 5. Then create a variable called page_number and set it to 2.

Rest API

books = ['Book 1', 'Book 2', 'Book 3', 'Book 4', 'Book 5', 'Book 6', 'Book 7', 'Book 8', 'Book 9', 'Book 10', 'Book 11', 'Book 12', 'Book 13', 'Book 14', 'Book 15', 'Book 16', 'Book 17', 'Book 18', 'Book 19', 'Book 20']
# Set page_size to 5 and page_number to 2
# Your code here

Need a hint?

Use simple assignment to create these two variables with the exact values.

3

Get books for the current page

Create a variable called current_page_books that uses slicing on books to get the books for the current page. Use page_size and page_number to calculate the start and end indexes.

Rest API

books = ['Book 1', 'Book 2', 'Book 3', 'Book 4', 'Book 5', 'Book 6', 'Book 7', 'Book 8', 'Book 9', 'Book 10', 'Book 11', 'Book 12', 'Book 13', 'Book 14', 'Book 15', 'Book 16', 'Book 17', 'Book 18', 'Book 19', 'Book 20']
page_size = 5
page_number = 2
# Use slicing to get current_page_books
# Your code here

Need a hint?

Calculate start_index and end_index using page_number and page_size, then slice books[start_index:end_index].

4

Print the current page books

Write a print statement to display the current_page_books list.

Rest API

books = ['Book 1', 'Book 2', 'Book 3', 'Book 4', 'Book 5', 'Book 6', 'Book 7', 'Book 8', 'Book 9', 'Book 10', 'Book 11', 'Book 12', 'Book 13', 'Book 14', 'Book 15', 'Book 16', 'Book 17', 'Book 18', 'Book 19', 'Book 20']
page_size = 5
page_number = 2
start_index = (page_number - 1) * page_size
end_index = start_index + page_size
current_page_books = books[start_index:end_index]
# Print the current_page_books list
# Your code here

Need a hint?

Use print(current_page_books) to show the books on page 2.