Classes and Objects
Learn how to create and use classes and objects in Python.
Classes and Objects is a free Learn AI with Python lesson on CoddyKit — lesson 1 of 6. You can read the complete lesson below for free — then practise it hands-on in the browser with a built-in code editor and a 24/7 AI tutor. It is part of the Learn AI with Python learning path, one of 6 lessons in the course, and your progress syncs across the web and the CoddyKit app.
1
Introduction to Classes and Objects
Object-Oriented Programming (OOP) is a programming paradigm that models real-world entities using classes and objects. This approach makes code more reusable and easier to manage.
In this lesson, you’ll learn the basics of classes and objects in Python.
2
What Are Classes?
A class is a blueprint for creating objects. It defines the properties and behavior of objects.
class Person:
pass3
4
What Are Objects?
An object is an instance of a class. It represents a specific entity created from the blueprint defined by the class.
# Defining a class and creating an object
class Person:
pass
person1 = Person()
print(type(person1)) # Outputs: <class '__main__.Person'>5
Creating Classes
To define a class, use the class keyword followed by the class name. The class name should follow PascalCase convention:
# Defining a simple class
class Car:
pass6
Creating and Using Objects
Once a class is defined, you can create objects (instances) of the class:
# Creating objects from a class
class Car:
pass
car1 = Car()
car2 = Car()
print(car1, car2)7
Adding Attributes to Classes
You can add attributes to a class to store data related to the object:
# Adding attributes to a class
class Car:
def __init__(self, brand, model):
self.brand = brand
self.model = model
car1 = Car("Toyota", "Corolla")
print(car1.brand, car1.model)8
Methods in Classes
Methods are functions defined inside a class. They define the behavior of the objects:
# Adding methods to a class
class Car:
def __init__(self, brand, model):
self.brand = brand
self.model = model
def drive(self):
print(f"The {self.brand} {self.model} is driving.")
car1 = Car("Toyota", "Corolla")
car1.drive()9
10
Common Mistakes with Classes and Objects
Here are some mistakes to avoid:
- Forgetting to use
selfas the first parameter in methods. - Trying to access attributes that are not defined in the class.
- Not initializing attributes using the
__init__method.
11
What Did We Learn?
In this lesson, you learned:
- What classes and objects are in Python.
- How to create classes and instantiate objects.
- How to define attributes and methods in a class.
Great job! Let’s move to the next topic.
Frequently asked questions
Is the “Classes and Objects” lesson free?
Yes — the full text of “Classes and Objects” is free to read here on the web, and the Learn AI with Python course includes 6 lessons in total. To practise it interactively (a built-in code editor and a 24/7 AI tutor) and unlock the rest of the Learn AI with Python course, upgrade to CoddyKit PRO.
What will I learn in “Classes and Objects”?
Learn how to create and use classes and objects in Python. You practise Learn AI with Python with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.
Do I need any experience to start Learn AI with Python?
No prior experience is required. Learn AI with Python on CoddyKit is structured for beginners through advanced learners; this is — lesson 1 of 6, so you can start here or from the beginning and move at your own pace.
How long does the “Classes and Objects” lesson take?
Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.
Can I write and run code in this Learn AI with Python lesson?
Yes. Every Learn AI with Python lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.