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-### **Day 19: Introduction to Object-Oriented Programming (OOP)**
-Object-Oriented Programming is a programming paradigm that uses objects to represent real-world entities.
-
-- **Classes and Objects:**
-  - Classes define blueprints for creating objects.
-  - Objects are instances of classes.
-- **Attributes and Methods:**
-  - Classes can have attributes (data) and methods (functions) that define their properties and behavior.
-
-**Example of creating a simple class and an object:**
-```python
-# Define a simple class
-class Dog:
-    def __init__(self, name):
-        self.name = name
-
-    def bark(self):
-        print(f"{self.name} says woof!")
-
-# Create an object (instance) of the Dog class
-my_dog = Dog("Buddy")
-my_dog.bark()  # Call the bark method on the object
-```
-
-### **Day 20: Class Attributes and Methods**
-Classes can have attributes and methods that define their behavior.
-
-- **Class Attributes:**
-  - Class attributes are shared among all instances of the class.
-- **Instance Attributes:**
-  - Instance attributes are specific to individual objects.
-- **Methods:**
-  - Methods are functions defined within a class.
-
-**Example of class attributes and methods:**
-```python
-class Circle:
-    def __init__(self, radius):
-        self.radius = radius
-
-    def area(self):
-        return 3.14159 * self.radius**2
-
-    def circumference(self):
-        return 2 * 3.14159 * self.radius
-
-my_circle = Circle(5)
-print(f"Area: {my_circle.area()}")
-print(f"Circumference: {my_circle.circumference()}")
-```
-
-### **Day 21: Inheritance**
-Inheritance allows you to create new classes that inherit attributes and methods from existing classes.
-
-- **Parent Class (Superclass):**
-  - The parent class defines common attributes and methods.
-- **Child Class (Subclass):**
-  - The child class inherits from the parent class and can have additional attributes and methods.
-
-**Example of inheritance:**
-```python
-# Parent class
-class Animal:
-    def __init__(self, name):
-        self.name = name
-
-    def speak(self):
-        pass
-
-# Child class inheriting from Animal
-class Dog(Animal):
-    def speak(self):
-        return f"{self.name} says woof!"
-
-my_dog = Dog("Buddy")
-print(my_dog.speak())  # Calls the speak method of the Dog class
-```
-
-### **Day 22: Polymorphism**
-Polymorphism allows objects of different classes to be treated as objects of a common superclass.
-
-- **Common Superclass:**
-  - Create a common superclass that defines shared methods or attributes.
-- **Subclasses with Different Implementations:**
-  - Subclasses provide their own implementations of methods.
-
-**Example of polymorphism:**
-```python
-# Common superclass
-class Shape:
-    def area(self):
-        pass
-
-# Subclasses with different implementations of area
-class Circle(Shape):
-    def __init__(self, radius):
-        self.radius = radius
-
-    def area(self):
-        return 3.14159 * self.radius**2
-
-class Rectangle(Shape):
-    def __init__(self, width, height):
-        self.width = width
-        self.height = height
-
-    def area(self):
-        return self.width * self.height
-
-shapes = [Circle(5), Rectangle(4, 6)]
-
-for shape in shapes:
-    print(f"Area: {shape.area()}")
-```
-
-Object-Oriented Programming (OOP) is a fundamental concept in Python and many other programming languages. It allows you to model real-world entities, promote code organization, and enhance code reusability. Practice with these examples to become proficient in using OOP principles in Python.
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