def unregister(self):
        """remove all instrumentation established by this ClassManager."""

        self._uninstrument_init()

        self.mapper = self.dispatch = None
        self.info.clear()

        for key in list(self):
            if key in self.local_attrs:
                self.uninstrument_attribute(key)
dataset/ETHPy150Open RoseOu/flasky/venv/lib/python2.7/site-packages/sqlalchemy/orm/instrumentation.py/ClassManager.unregister/original