Now, look at the code that you have written and describe this for yourself:

```python
from abc import ABC, abstractmethod


class AuthMixin:
    is_authenticated = False
    
    def login(self, taken_password):
        if self.password == taken_password:
            self.is_authenticated = True
            print(f"{self.username} is authenticated")
        else:
            print("Wrong password!")

    def logout(self):
        self.is_authenticated = False
        print(f"{self.username} is loggouted")


class AbstractAdmin(ABC):
    @abstractmethod
    def login():
        pass
    
    @abstractmethod
    def logout():
        pass
        
    @abstractmethod
    def create_content():
        pass
    
    @abstractmethod
    def update_content():
        pass
    
    @abstractmethod
    def delete_content():
        pass


class User(AuthMixin):
    role = "User"
    
    def __init__(self, username, password):
        self.username = username
        self.password = password
    
    @property
    def password(self):
        return self._password

    @password.setter
    def password(self, new_password):
        if isinstance(new_password, str):
            if len(new_password) >= 8:
                self._password = new_password
            else:
                print("The password length should be >= 8.")
        else:
            print("The password should be string.")
            
    def __repr__(self):
        return f"{self.role}: {self.username}"
    
    def __eq__(self, other):
        if isinstance(other, User):
            return self.username == other.username
        
        if isinstance(other, str):
            return self.username == other
        
        return False


class Admin(User, AbstractAdmin):
    role = "Admin"
    
    def create_content(self):
        print(f"{self.username} creates the content")
        
    def update_content(self):
        print(f"{self.username} updates the content")
        
    def delete_content(self):
        print(f"{self.username} deletes the content")
```

You can understand this code with 85 lines. **Congratulations!**  
You have mastered **Object-Oriented Programming** in Python and can use the necessary functionality!

This course covers Object-Oriented Programming (OOP) in Python, starting with the basics and progressing to advanced concepts. You will implement a User model to gain practical experience and understanding of OOP features. By the end of the course, you will have a strong foundation in OOP and a deeper knowledge of Python's inner workings.

Let's start! The Object-Oriented Programming basic concepts are waiting for you here! In this section, you will get acquainted with the most important concepts for understanding Object-Oriented Programming.

Inheritance - the first of the OOP principles. The entities can be inherited from other ones. You learn how it works in code here.

Inheritance - the second of the OOP principles. The attributes and methods can be closed inside the class and used by the class only. Here you learn how to code with different access modifiers.

Polymorphism and abstraction are the third and fourth of the OOP principles. These principles are not easy to understand. Here you will get to know them in the simplest ways.

The magic methods make sandbox from Python. It's a unique Python tool you can't see in other languages. Here you learn how to use these methods and about the flexibility that they bring to Python.

Summary

1. Remember all OOP concepts:

2. What are magic methods?