code: def remove_attribute_listener(self, attr_name, observer):
          
          listeners_for_attr = self._attribute_listeners.get(attr_name)
          if listeners_for_attr is not None:
              listeners_for_attr.remove(observer)
              if len(listeners_for_attr) == 0:
                  del self._attribute_listeners[attr_name]
docs: Remove an attribute listener (observer) that was previously added using :py:func:`add_attribute_listener`.
  
          For example, the following line would remove a previously added vehicle 'global_frame'
          observer called ``location_callback``:
  
          .. code:: python
  
              vehicle.remove_attribute_listener('global_frame', location_callback)
  
          See :ref:`vehicle_state_observe_attributes` for more information.
  
          :param String attr_name: The attribute name that is to have an observer removed (or '*' to remove an 'all attribute' observer).
          :param observer: The callback function to remove.