4 Oop: Python 3 Deep Dive Part

: Comprehensive coverage of methods like __init__ , __str__ , __repr__ , and __call__ . These allow custom objects to integrate seamlessly with Python’s built-in operators and functions.

When you access an attribute like obj.x , Python follows a specific lookup chain:

The most magical part of Pythoria was . It meant "many forms."

Using __slots__ tells Python not to use a dynamic dictionary, but rather a fixed-size array. python 3 deep dive part 4 oop

class Speaker: def say_hello(self): return "Welcome to the OOP deep dive!" Use code with caution.

class Singleton(type): _instances = {} def __call__(cls, *args, **kwargs): if cls not in cls._instances: cls._instances[cls] = super().__call__(*args, **kwargs) return cls._instances[cls] class Database(metaclass=Singleton): pass Use code with caution. Conclusion

p = Person("John", "Doe") print(p.full_name) # "John Doe" p.full_name = "Jane Smith" print(p.full_name) # "Jane Smith" : Comprehensive coverage of methods like __init__ ,

print(DataHolder..keys())

class Car: def __init__(self, make, model): self.make = make self.model = model my_car = Car("Toyota", "Corolla") Use code with caution. Class Attributes vs. Instance Attributes

Python provides many special methods ( __magic__ methods) to control how objects behave, compare, and represent themselves. Custom Representations: __repr__ and __str__ It meant "many forms

This article explores the advanced inner workings of Python OOP, covering topics such as slots, custom representations, multiple inheritance, and meta-programming, largely inspired by the comprehensive material found in the Udemy Python 3: Deep Dive (Part 4 - OOP) course. 1. Beyond the Basics: Understanding Python Object Internals

Attribute lookup is faster because it's not a hash map lookup.

Use __slots__ when optimizing applications processing massive datasets.

Python supports multiple inheritance, and the C3 linearization algorithm determines the method resolution order (MRO). The MRO defines the order in which base classes are searched for methods and attributes.

: Massive memory savings when instantiating millions of small objects. Pro : Slightly faster attribute access times.