Python 3 Deep Dive Part 4 Oop High Quality ~repack~

Understanding that classes are objects unlocks metaprogramming, factories, and class decorators.

p = Product() p.name = "Laptop" p.price = 999 print(p) # Product('name': 'Laptop', 'price': 999) python 3 deep dive part 4 oop high quality

: To use objects as keys in a dictionary or in a set, you must implement both __eq__ and __hash__ consistently. Summary Table: Advanced OOP Tools Primary Purpose High-Quality Impact Properties Encapsulation Validates data without changing public API Slots Optimization Reduces memory footprint for large scale Descriptors Reusable Logic Centralizes attribute management logic Metaclasses Class Creation Enforces architectural constraints at runtime Abstract Base Classes Interface Definition Ensures subclasses implement required methods python 3 deep dive part 4 oop high quality

def greet(self): print("Hello")

class A: pass class B(A): pass class C(A): pass class D(B, C): pass python 3 deep dive part 4 oop high quality

The GoF “Design Patterns” book didn’t say “Favor composition — except in Python.” The rule applies universally.