def get_property(self, key, _configure_mappers=True):
        """return a MapperProperty associated with the given key.
        """

        if _configure_mappers and Mapper._new_mappers:
            configure_mappers()

        try:
            return self._props[key]
        except __HOLE__:
            raise sa_exc.InvalidRequestError(
                "Mapper '%s' has no property '%s'" % (self, key))
dataset/ETHPy150Open goFrendiAsgard/kokoropy/kokoropy/packages/sqlalchemy/orm/mapper.py/Mapper.get_property