Greetings! Today, we're revisiting Python classes, the core building block of Object-Oriented Programming (OOP) in Python. Through hands-on examples, we'll revisit the fundamental concepts of Python classes, including their structure, attributes, and methods.

Let's begin with a refresher on Python classes. Essential to OOP, Python classes bundle relevant data and functions into compact units called objects. Consider a video game character, which is a typical example of a class instance, with specific attributes (such as health or strength) and methods (such as attack or defense).

Python classes facilitate the grouping of associated code elements, simplifying their management. Now, to better remind ourselves how the above example works, let's go through it step-by-step.

A Python class serves as a blueprint consisting of attributes and methods. While attributes represent data relevant to a class instance, methods are actions or functions that manipulate this data. Each class includes an __init__ function, also known as a constructor, which is used to define class attributes.

An essential keyword within these methods is self, which represents the class instance. In object-oriented programming, it's needed to access the class's attributes and methods. When a new class instance is created, Python automatically passes it to the self parameter to access individual instance attributes and methods using the keyword. This mechanism allows each object to keep track of its own state and behaviors.