code: def removeItem(self, regItem):
          
          check_class(regItem, ClassRegItem)
          logger.info("Removing {!r} containing {}".format(regItem.identifier, regItem.fullClassName))
  
          del self._index[regItem.identifier]
          idx = self._items.index(regItem)
          del self._items[idx]
docs: Removes a ClassRegItem object to the registry.
              Will raise a KeyError if the regItem is not registered.