Why flexible querying empowers clients in Rest API - See It in Action

Why flexible querying empowers clients

📖 Scenario: You are building a simple REST API for a bookstore. Clients want to get books data but with flexibility to choose which books to see based on filters like genre or price.

🎯 Goal: Build a REST API endpoint that allows clients to query books flexibly by genre and maximum price using query parameters.

📋 What You'll Learn

Create a list of books with title, genre, and price

Add variables to capture query parameters for genre and max price

Filter the books list based on these parameters

Return the filtered list as JSON response

💡 Why This Matters

🌍 Real World

Flexible querying lets clients get exactly the data they want without extra information. This saves bandwidth and improves user experience.

💼 Career

Many jobs require building APIs that serve data efficiently. Understanding flexible querying is key to making APIs useful and scalable.

1

DATA SETUP: Create the books data list

Create a list called books with these exact dictionaries: {'title': 'The Alchemist', 'genre': 'Fiction', 'price': 10}, {'title': 'Python 101', 'genre': 'Programming', 'price': 25}, {'title': 'Cooking Basics', 'genre': 'Cooking', 'price': 15}

Rest API

# Create the list called books with the exact dictionaries
# Your code here

Need a hint?

Use a list with dictionaries. Each dictionary has keys 'title', 'genre', and 'price'.

2

CONFIGURATION: Capture query parameters for filtering

Create two variables: filter_genre set to "Programming" and max_price set to 20 to simulate client query parameters

Rest API

books = [
    {'title': 'The Alchemist', 'genre': 'Fiction', 'price': 10},
    {'title': 'Python 101', 'genre': 'Programming', 'price': 25},
    {'title': 'Cooking Basics', 'genre': 'Cooking', 'price': 15}
]
# Create filter_genre and max_price variables
# Your code here

Need a hint?

Set filter_genre to "Programming" and max_price to 20 exactly.

3

CORE LOGIC: Filter books based on genre and price

Create a list called filtered_books using a list comprehension that includes books from books where book['genre'] == filter_genre and book['price'] <= max_price

Rest API

books = [
    {'title': 'The Alchemist', 'genre': 'Fiction', 'price': 10},
    {'title': 'Python 101', 'genre': 'Programming', 'price': 25},
    {'title': 'Cooking Basics', 'genre': 'Cooking', 'price': 15}
]
filter_genre = "Programming"
max_price = 20
# Create filtered_books list with books matching genre and price
# Your code here

Need a hint?

Use a list comprehension with if conditions for genre and price.

4

OUTPUT: Print the filtered books list

Write a print(filtered_books) statement to display the filtered books list

Rest API

books = [
    {'title': 'The Alchemist', 'genre': 'Fiction', 'price': 10},
    {'title': 'Python 101', 'genre': 'Programming', 'price': 25},
    {'title': 'Cooking Basics', 'genre': 'Cooking', 'price': 15}
]
filter_genre = "Programming"
max_price = 20
filtered_books = [book for book in books if book['genre'] == filter_genre and book['price'] <= max_price]
# Print the filtered_books list
# Your code here

Need a hint?

Use print(filtered_books) to show the filtered list.