Python 3 Deep Dive Part 4 Oop High Quality • Real & Extended

Sized.register(MyContainer) # Now MyContainer is considered a subclass of Sized

def __set__(self, instance, value): if value <= 0: raise ValueError("Must be positive") instance.__dict__[self.name] = value class Order: quantity = PositiveNumber() price = PositiveNumber() python 3 deep dive part 4 oop high quality

print(MyClass.version) # 1.0

class Singleton: _instance = None def __new__(cls, *args, **kwargs): if cls._instance is None: cls._instance = super().__new__(cls) return cls._instance s1 = Singleton() s2 = Singleton() print(s1 is s2) # True value): if value &lt

class Circle: def __init__(self, radius): self.radius = radius # Uses setter if defined @property def radius(self): return self._radius we explored iterators

class Movable: def move(self): pass class Flyable: def fly(self): pass

Welcome back to the Python 3 Deep Dive series. In previous parts, we explored iterators, generators, context managers, and function mastery. Now, we arrive at the heart of Python’s identity: Object-Oriented Programming (OOP) .