code: def _map_player_request_to_func(self, player_request_type):
          
          # calbacks for on_playback requests are optional
          view_func = self._intent_view_funcs.get(player_request_type, lambda: None)
  
          argspec = inspect.getargspec(view_func)
          arg_names = argspec.args
          arg_values = self._map_params_to_view_args(player_request_type, arg_names)
  
          return partial(view_func, *arg_values)
docs: Provides appropriate parameters to the on_playback functions.