class RubberDuck(Quackable):
"""
Rubber Duck model
"""
def __init__(self):
self._observable = Observable(self)
def register_observer(self, observer) -> None:
self._observable.register_observer(observer)
def notify_observers(self) -> None:
self._observable.notify_observers()
def quack(self) -> None:
print('Squeak')
self.notify_observers()
def __str__(self) -> str:
return 'Rubber Duck'
class DuckCall(Quackable):
"""
Duck call model
"""
def __init__(self):
self._observable = Observable(self)
def register_observer(self, observer) -> None:
self._observable.register_observer(observer)
def notify_observers(self) -> None:
self._observable.notify_observers()
def quack(self) -> None:
print('Kwak')
self.notify_observers()
def __str__(self) -> str:
return 'Duck call'
class GooseAdapter(Quackable):
"""
Goose adapter
"""
def __init__(self, goose: Goose):
self._goose = goose
self._observable = Observable(self)
def quack(self) -> None:
self._goose.honk()
self.notify_observers()
def register_observer(self, observer) -> None:
self._observable.register_observer(observer)
def notify_observers(self) -> None:
self._observable.notify_observers()
def __str__(self) -> str:
return 'Goose pretending to be a Duck'
def __init__(self):
self._observable = Observable(self)
def __init__(self, goose: Goose):
self._goose = goose
self._observable = Observable(self)