Python 3 Deep Dive Part 4 Oop 💎

Object-Oriented Programming in Python 3 isn't just about making code "organized." It's about creating . By mastering classes, inheritance, and the magic of dunder methods, you move from being a mere scripter to a Master Architect of Pythoria.

This creates a circular relationship that powers Python’s dynamic nature.

The "story" of by Fred Baptiste is essentially a journey from using Python as a tool to understanding it as a master architect . While many courses teach you how to write a class, this specific deep dive explores the underlying mechanics of why Python behaves the way it does. The Core Narrative: Beyond the Basics

A non-data descriptor (like a standard method) found in the class MRO.

Substantially reduces memory usage by eliminating __dict__ . python 3 deep dive part 4 oop

print(my_dog.name) # Output: Fido print(my_dog.age) # Output: 3

If you check the type via the class namespace, it registers as a function: print(type(Speaker.say_hello)) # Output: Use code with caution.

def bark(self): print("Woof!")

class Person(metaclass=RequiredAttrsMeta): name = "John" # If omitted, TypeError at class definition time Object-Oriented Programming in Python 3 isn't just about

db1 = Database() db2 = Database() print(db1 is db2) # True (singleton)

: When you want to automatically modify classes at creation time (e.g., enforcing coding standards, automatic registration of classes).

class Wheels: def rotate(self): pass

: Understand how to modify class creation behavior. The "story" of by Fred Baptiste is essentially

class Uppercase(Logger): def log(self, msg): super().log(msg.upper())

As discussed in the Udemy deep dive, __slots__ is a powerful optimization technique. By defining __slots__ , you instruct Python not to use a dictionary, but rather a fixed-size space for attributes.

You can combine the performance of __slots__ with the simplicity of dataclasses by using @dataclass(slots=True) . 5. Summary of Key Takeaways

In the above example, the ElectricCar class inherits from the Car class and adds an additional attribute battery_capacity and a method charge .