Purpose of constructors in Python - Mini Project: Build & Apply

Purpose of constructors

📖 Scenario: Imagine you are creating a simple program to keep track of books in a library. Each book has a title and an author. You want to create a way to make new book entries easily and correctly.

🎯 Goal: Build a Python class called Book that uses a constructor to set the title and author when a new book is created. Then, print the details of the book.

📋 What You'll Learn

Create a class named Book

Add a constructor method __init__ that takes self, title, and author as parameters

Inside the constructor, set self.title and self.author to the given values

Create an instance of Book with title 'The Great Gatsby' and author 'F. Scott Fitzgerald'

Print the book's title and author in the format: Title: The Great Gatsby, Author: F. Scott Fitzgerald

💡 Why This Matters

🌍 Real World

Constructors help create objects with the right starting information, like making a new book record with its title and author.

💼 Career

Understanding constructors is essential for software development jobs that use object-oriented programming to organize and manage data.

1

Create the Book class

Create a class called Book with no content inside yet.

Python

class Book:
    # Your code here

Need a hint?

Use the class keyword followed by the class name and a colon.

2

Add the constructor method

Inside the Book class, add a constructor method named __init__ that takes self, title, and author as parameters. Inside it, set self.title = title and self.author = author.

Python

class Book:
    def __init__(self, title, author):
        # Your code here

Need a hint?

The constructor method is named __init__ and sets the instance variables.

3

Create a Book instance

Create a variable called my_book and assign it a new Book object with title 'The Great Gatsby' and author 'F. Scott Fitzgerald'.

Python

class Book:
    def __init__(self, title, author):
        self.title = title
        self.author = author

# Your code here

Need a hint?

Use the class name followed by parentheses with the title and author as arguments.

4

Print the book details

Print the book's title and author from my_book in this exact format: Title: The Great Gatsby, Author: F. Scott Fitzgerald.

Python

class Book:
    def __init__(self, title, author):
        self.title = title
        self.author = author

my_book = Book('The Great Gatsby', 'F. Scott Fitzgerald')

# Your code here

Need a hint?

Use an f-string to format the output with my_book.title and my_book.author.