如何使用我在另一個類中使用的對象的類方法？

Question

基本上是這樣的

class Key: 

    def __init__(self, pressed): 
     '''(Key, bool) -> NoneType 
     ''' 
     self._pressed = pressed 

    def change_press_state(self): 
     self._pressed = not self._pressed 

class KeyBoard: 

    def __init__(self, how_many): 
     '''(KeyBoard, int) -> NoneType 
     Makes a Keyboard of 'how_many' keys. 
     ''' 

     self._keys = [] 
     for i in range (0, how_many): 
      self._keys.append(KeyBoard(False)) 

    def switch_status_of_key(self, index_of_key): 
     '''(KeyBoard) -> NoneType 
     Presses key if isn't and stops pressing key if it is. 
     ''' 

我怎麼會呼籲用戶要switch_status_of_key切換特定鍵change_press_state？ 我在想像

self._keys[key] = self._keys[key].flip() 

但顯然不是因爲我得到的錯誤。

Answer 1

self._keys.append(KeyBoard(False)) 

應該是：

self._keys.append(Key(False)) 

和

def switch_status_of_key(self, index_of_key): 
     '''(KeyBoard) -> NoneType 
     Presses key if isn't and stops pressing key if it is. 
     ''' 
     self._keys[index_of_key].change_press_state()