Python复合设计模式-递归错误：超过最大递归深度

因此，我仔细阅读了一些设计模式的书籍，我决定用python编写自己的（这本书是为Java编写的），我偶然发现了这个我无法解决的问题，我在这里遗漏了什么

那么，我为什么要在这里得到递归错误呢

class Component:

    _components = []

    def __init__(self, value):
        self.value = value

    def add(self, *components):
        self._components.extend(components)

    def remove(self, *components):
        self._components = list(set(self._components).difference(set(components)))

    def get_components(self):
        return self._components

    def __repr__(self):
        return "Component value: {}".format(self.value)


class ComputerComponent(Component):

    def turn_on(self):
        self.on = True
        for component in self.get_components( ):
            component.turn_on( )
        print("{} turned on".format(self.value))



class Computer(ComputerComponent):
    pass

class LCDScreen(ComputerComponent):
    pass

class Mouse(ComputerComponent):
    pass

class Keyboard(ComputerComponent):
    pass

computer = Computer("computer")
lcd_screen = LCDScreen("lcd_screen")
mouse = Mouse("mouse")
keyboard = Keyboard("keyboard")

computer.add(lcd_screen,mouse,keyboard)

computer.turn_on( )

---

\u组件

应该是实例变量，而不是类变量。实际上，将这些组件添加到计算机会将它们添加到所有其他组件。也就是说，每个组件都是其他组件的组件，这会导致无限循环

class Component:

    def __init__(self, value):
        self.value = value
        self._components = []

    def add(self, *components):
        self._components.extend(components)

    def remove(self, *components):
        self._components = list(set(self._components).difference(set(components)))

    def get_components(self):
        return self._components

    def __repr__(self):
        return "Component value: {}".format(self.value)

---

\u组件

应该是实例变量，而不是类变量。实际上，将这些组件添加到计算机会将它们添加到所有其他组件。也就是说，每个组件都是其他组件的组件，这会导致无限循环

class Component:

    def __init__(self, value):
        self.value = value
        self._components = []

    def add(self, *components):
        self._components.extend(components)

    def remove(self, *components):
        self._components = list(set(self._components).difference(set(components)))

    def get_components(self):
        return self._components

    def __repr__(self):
        return "Component value: {}".format(self.value)