code: def _frame_advance(self, action):
          
          # set the action on the controller
          self.controllers[0][:] = action
          # perform a step on the emulator
          _LIB.Step(self._env)
docs: Advance a frame in the emulator with an action.
  
          Args:
              action (byte): the action to press on the joy-pad
  
          Returns:
              None