old_contents: from .base import BaseEntity
  from kivy.core.window import Window
  
  class Ship(BaseEntity):
      pass
new_contents: from .base import BaseEntity
  from kivy.core.window import Window
  
  class Ship(BaseEntity):
      def __init__(self, *args, **kwargs):
          super(Ship, self).__init__(*args, **kwargs)
          self.active = True
subject: Initialize the ship with active set up to True