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OOP — Classes

6 min read Quiz at the end

Define classes with class and create objects with MyClass(). __init__ initialises the object. self refers to the current instance. Instance attributes are unique per object while class attributes are shared.

Object-Oriented Programming

class Animal:
    def __init__(self, name, sound):
        self.name  = name
        self.sound = sound

    def speak(self):
        return f"{self.name} says {self.sound}"

dog = Animal("Rex", "Woof")
print(dog.speak())   # Rex says Woof
print(dog.name)      # Rex

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Topic Quiz · 5 questions

Test your understanding before moving on

1. What is __init__?

💡 __init__ is the initialiser (constructor) — called when an object is created.

2. What does self refer to?

💡 self refers to the current instance of the class.

3. How do you create an object?

💡 Objects are created by calling the class like a function: obj = ClassName(args).

4. What is a class attribute?

💡 Class attributes are defined on the class and shared by all instances.

5. What does instance attribute mean?

💡 Instance attributes (self.attr = value) are unique to each object.

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OOP — Classes

Object-Oriented Programming

Test your understanding before moving on