old_contents: """Platform interface for servos."""
  import abc
  
  
  class ServoPlatformInterface(metaclass=abc.ABCMeta):
  
      """Interface for servos in hardware platforms.
  
      ServoPlatformInterface is an abstract base class that should be overridden for all
      servo interface classes on supported platforms.  This class ensures the proper required
      methods are implemented to support servo operations in MPF.
      """
  
      __slots__ = []
  
      @abc.abstractmethod
      def go_to_position(self, position):
          """Move servo to a certain position."""
          raise NotImplementedError
  
new_contents: """Platform interface for servos."""
  import abc
  
  
  class ServoPlatformInterface(metaclass=abc.ABCMeta):
  
      """Interface for servos in hardware platforms.
  
      ServoPlatformInterface is an abstract base class that should be overridden for all
      servo interface classes on supported platforms.  This class ensures the proper required
      methods are implemented to support servo operations in MPF.
      """
  
      __slots__ = []
  
      @abc.abstractmethod
      def go_to_position(self, position):
          """Move servo to a certain position."""
          raise NotImplementedError
  
      def set_speed_limit(self, speed_limit):
          """Set speed limit."""
          pass
  
      def set_acceleration_limit(self, acceleration_limit):
          """Set acceleration limit."""
          pass
  
subject: add missing methods in base class