rtree/index.py
def flush(self, context, returnError):
        """please override"""
        returnError.contents.value = self.IllegalStateError
        raise NotImplementedError("You must override this method.")
def flush(self, context, returnError):
        """please override"""
        returnError.contents.value = self.IllegalStateError
        raise NotImplementedError("You must override this method.")
please override