def install_descriptor(self, key, inst):
        if key >= (self.STATE_ATTR, self.MANAGER_ATTR):
            raise KeyError("%r: requested attribute name conflicts with "
                           "instrumentation attribute of the same name." %
                           key)
        setattr(self.class_, key, inst)
dataset/ETHPy150Open RoseOu/flasky/venv/lib/python2.7/site-packages/sqlalchemy/orm/instrumentation.py/ClassManager.install_descriptor/operator `in` -> `>=`