class Report: def __init__(self, formatter, storage): self.formatter = formatter self.storage = storage def generate(self): data = self.storage.fetch() return self.formatter.format(data)
Almost always. Class decorators and __init_subclass__ (Python 3.6+) solve 99% of metaclass use cases more simply. python 3 deep dive part 4 oop high quality
: Covering single inheritance and the role special "dunder" functions play in creating polymorphic behavior. class Report: def __init__(self, formatter, storage): self
This violates LSP because a Square changes both dimensions when one is set. class Report: def __init__(self