Constructor parameters in Python - Mini Project: Build & Apply

Constructor parameters

📖 Scenario: You are creating a simple program to manage information about books in a library. Each book has a title and an author.

🎯 Goal: You will build a Python class called Book that uses constructor parameters to set the title and author when creating a new book object.

📋 What You'll Learn

Create a class named Book

Add a constructor method __init__ with parameters title and author

Store the title and author as instance variables

Create an instance of Book with title '1984' and author 'George Orwell'

Print the book's title and author

💡 Why This Matters

🌍 Real World

Classes with constructors are used to create objects that represent real things, like books, users, or products, with their own data.

💼 Career

Understanding constructors is essential for software development jobs where object-oriented programming is used to organize code and data.

1

Create the Book class with an empty constructor

Create a class called Book with a constructor method __init__ that takes self as the only parameter. Inside the constructor, write pass to keep it empty for now.

Python

class Book:
    def __init__(self):
        # Your code here
        pass

Need a hint?

Remember, a constructor method in Python is named __init__ and always has self as the first parameter.

2

Add title and author parameters to the constructor

Modify the __init__ method to accept two parameters: title and author, in addition to self. Inside the constructor, assign these parameters to instance variables self.title and self.author.

Python

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

Need a hint?

Use self.title = title and self.author = author inside the constructor to save the values.

3

Create a Book object with title and author

Create a variable called my_book and assign it a new Book object with the title '1984' and author 'George Orwell'.

Python

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

# Your code here
data = None

Need a hint?

Use my_book = Book('1984', 'George Orwell') to create the object.

4

Print the book's title and author

Write a print statement that outputs the book's title and author in the format: Title: 1984, Author: George Orwell using the my_book object.

Python

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

my_book = Book('1984', 'George Orwell')

# Your code here

Need a hint?

Use an f-string like print(f"Title: {my_book.title}, Author: {my_book.author}") to show the values.