code: def _tracker(self, _observer_, _self_, *args, **kwds):
          
          self.track_object(_self_,
                            name=_observer_.name,
                            resolution_level=_observer_.detail,
                            keep=_observer_.keep,
                            trace=_observer_.trace)
          _observer_.init(_self_, *args, **kwds)
docs: Injected constructor for tracked classes.
          Call the actual constructor of the object and track the object.
          Attach to the object before calling the constructor to track the object with
          the parameters of the most specialized class.