装饰者模式

class Component:
    def operator(self):
        pass


class ConcreteComponent(Component):
    def operator(self):
        return "ConcreteComponent operator"


class Decorator(Component):
    def __init__(self, component) -> None:
        super().__init__()
        self.component = component

    def operator(self):
        return self.component.operator()


class ConcreteDecoratorA(Decorator):
    def operator(self):
        return "DecoratorA " + super().operator()


class ConcreteDecoratorB(Decorator):
    def operator(self):
        return "DecoratorB " + super().operator()


# 鍒涘缓鍏蜂綋缁勪欢
component = ConcreteComponent()
print("Component: ", component.operator())

# 浣跨敤鍏蜂綋瑁呴グ鑰匒鍖呰缁勪欢
decorator_a = ConcreteDecoratorA(component)
print("Decorator A: ", decorator_a.operator())

# 浣跨敤鍏蜂綋瑁呴グ鑰匓鍖呰缁勪欢
decorator_b = ConcreteDecoratorB(component)
print("Decorator B: ", decorator_b.operator())

# 浣跨敤鍏蜂綋瑁呴グ鑰匒鍜孊鐨勭粍鍚堝寘瑁呯粍浠?
decorator_ab = ConcreteDecoratorA(ConcreteDecoratorB(component))
print("Decorator A + B: ", decorator_ab.operator())

可以极大的减少自学的成本