old_contents: """Flasher config player."""
  from mpf.config_players.device_config_player import DeviceConfigPlayer
  from mpf.core.delays import DelayManager
  
  
  class FlasherPlayer(DeviceConfigPlayer):
  
      """Triggers flashers based on config."""
  
      config_file_section = 'flasher_player'
      show_section = 'flashers'
  
      __slots__ = ["delay"]
  
      def __init__(self, machine):
          """Initialise flasher_player."""
          super().__init__(machine)
          self.delay = DelayManager(self.machine.delayRegistry)
  
      def play(self, settings, context, calling_context, priority=0, **kwargs):
          """Flash flashers."""
          del kwargs
  
          for flasher, s in settings.items():
              if isinstance(flasher, str):
                  self._flash(self.machine.lights[flasher],
                              duration_ms=s['ms'],
                              key=context)
              else:
                  self._flash(flasher, duration_ms=s['ms'], key=context)
  
      def _flash(self, light, duration_ms, key):
          light.color("white", fade_ms=0, key=key)
          self.delay.add(duration_ms, self._remove_flash, light=light, key=key)
  
      @staticmethod
      def _remove_flash(light, key):
          light.remove_from_stack_by_key(key=key, fade_ms=0)
  
      def get_express_config(self, value):
          """Parse express config."""
          return dict(ms=value)
  
new_contents: """Flasher config player."""
  from mpf.config_players.device_config_player import DeviceConfigPlayer
  from mpf.core.delays import DelayManager
  from mpf.core.utility_functions import Util
  
  
  class FlasherPlayer(DeviceConfigPlayer):
  
      """Triggers flashers based on config."""
  
      config_file_section = 'flasher_player'
      show_section = 'flashers'
  
      __slots__ = ["delay"]
  
      def __init__(self, machine):
          """Initialise flasher_player."""
          super().__init__(machine)
          self.delay = DelayManager(self.machine.delayRegistry)
  
      def play(self, settings, context, calling_context, priority=0, **kwargs):
          """Flash flashers."""
          del kwargs
  
          for flasher, s in settings.items():
              if isinstance(flasher, str):
                  flasher_names = Util.string_to_list(flasher)
                  for flasher_name in flasher_names:
                      self._flash(self.machine.lights[flasher_name],
                                  duration_ms=s['ms'],
                                  key=context)
              else:
                  self._flash(flasher, duration_ms=s['ms'], key=context)
  
      def _flash(self, light, duration_ms, key):
          light.color("white", fade_ms=0, key=key)
          self.delay.add(duration_ms, self._remove_flash, light=light, key=key)
  
      @staticmethod
      def _remove_flash(light, key):
          light.remove_from_stack_by_key(key=key, fade_ms=0)
  
      def get_express_config(self, value):
          """Parse express config."""
          return dict(ms=value)
  
subject: Allow list of flashers as show token value