old_contents: from .module import Module
  
  
  class Potentiometer(Module):
      possible_events = {'moved'}
  
      def __init__(self, id, alias, robot):
          Module.__init__(self, 'Potentiometer', id, alias, robot)
          self._value = 0
  
      @property
      def position(self):
          """ Position in degrees. """
          return self._value
  
      def _update(self, new_state):
          Module._update(self, new_state)
          if 'position' in new_state:
              new_pos = new_state['position']
              if new_pos != self._value:
                  self._value = new_pos
                  self._pub_event('moved', self._value, self.position)
  
new_contents: from .module import Module
  
  
  class Potentiometer(Module):
      possible_events = {'moved'}
  
      def __init__(self, id, alias, robot):
          Module.__init__(self, 'Potentiometer', id, alias, robot)
          self._value = 0
  
      @property
      def position(self):
          """ Position in degrees. """
          return self._value
  
      def _update(self, new_state):
          Module._update(self, new_state)
          if 'rot_position' in new_state:
              new_pos = new_state['rot_position']
              if new_pos != self._value:
                  self._value = new_pos
                  self._pub_event('moved', self._value, self.position)
  
subject: change position to rot_position for potentiometer