Python 3 Deep Dive Part 4 Oop High Quality [new] ★ < PLUS >

@abstractmethod def write(self, data): pass

def area(self): return 3.14 * self.radius ** 2

Used to call methods from base classes, crucial for cooperative multiple inheritance. 5. Metaclasses: The Class Factory python 3 deep dive part 4 oop high quality

3. Abstract Base Classes vs. Protocols (Structural Subtyping)

class User: def __init__(self, name): self._name = name @property def name(self): return self._name @name.setter def name(self, value): self._name = value Use code with caution. Abstract Base Classes vs

Use sparingly, reserved primarily for framework architectural constraints and system-wide validation rules.

class ShoppingCart: def __init__(self): self._items = [] def __len__(self): return len(self._items) def __getitem__(self, index): return self._items[index] def __setitem__(self, index, value): self._items[index] = value class ShoppingCart: def __init__(self): self

: Mastery of iterators, iterables, generators, and context managers. Hashing and Mapping

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are the underlying mechanism for properties, providing powerful attribute access control.

ABCs require explicit inheritance. A class must explicitly inherit from the ABC or register with it to be considered a subclass.