code: def _maybe_update_cacher(self, clear=False, verify_is_copy=True):
          
  
          cacher = getattr(self, '_cacher', None)
          if cacher is not None:
              ref = cacher[1]()
  
              # we are trying to reference a dead referant, hence
              # a copy
              if ref is None:
                  del self._cacher
              else:
                  try:
                      ref._maybe_cache_changed(cacher[0], self)
                  except Exception:
                      pass
  
          if verify_is_copy:
              self._check_setitem_copy(stacklevel=5, t='referant')
  
          if clear:
              self._clear_item_cache()
docs: See if we need to update our parent cacher if clear, then clear our
          cache.
  
          Parameters
          ----------
          clear : boolean, default False
              clear the item cache
          verify_is_copy : boolean, default True
              provide is_copy checks