What is the difference between classes and mixins?

• Class - the main unit of OOP, describing the structure and behavior of objects. Can inherit from each other, forming a hierarchy. Classes usually represent real or abstract entities.
• Mixin - a class intended to add specific behavior or functionality to other classes via multiple inheritance. Mixins are not meant to be instantiated on their own and often have no internal state. Their main purpose is to provide "mixable" functionality.

Attribute	Class	Mixin
Purpose	Describe entities and create objects	Add behavior to other classes
Object creation	Usually possible	Usually not intended or possible
State	Often has (instance attributes)	Often has none (only methods)
Inheritance	Can inherit or be inherited from	Usually inherited by other classes
Example	User, Product, DatabaseConnection	SerializableMixin, DebugPrintMixin

# Example class
class Animal:
    def __init__(self, name):
        self.name = name
    def make_sound(self):
        pass # To be overridden

# Example mixin
class WalkableMixin:
    def walk(self):
        print(f"{self.name} is walking.")

# Class using mixin
class Dog(Animal, WalkableMixin):
    def make_sound(self):
        print("Woof!")

# Creating an instance
my_dog = Dog("Buddy")
my_dog.make_sound() # Outputs "Woof!"
my_dog.walk()  # Outputs "Buddy is walking."

# Usually, creating an instance of a mixin is not meaningful
# mx = WalkableMixin() # Will not work without 'name' attribute