Python 3 Deep Dive Part 4 Oop |work| Access

class Countdown: def __init__(self, start): self.start = start def __iter__(self): return self def __next__(self): if self.start <= 0: raise StopIteration self.start -= 1 return self.start + 1

def __set__(self, obj, value): if value <= 0: raise ValueError("Must be positive") obj.__dict__[self.name] = value python 3 deep dive part 4 oop

Before writing complex code, you must understand how Python constructs classes and manages memory. class Countdown: def __init__(self, start): self

Prefer composition over inheritance unless there is a genuine "is-a" relationship. class Countdown: def __init__(self

: Detailed coverage of "dunder" methods (e.g., __str__ , __repr__ , __del__ ) and how they enable custom behavior for arithmetic operators and rich comparisons.

class Bad: def __init__(self, items=[]): self.items = items # Shared across all instances!