session.py 文件源码

def __init__(self, problem, database = "featurehub"):
        self.__database            = database
        self.__orm                 = ORMManager(database)
        self.__username            = None

        with self.__orm.session_scope() as session:
            try:
                problem = session.query(Problem)\
                                 .filter(Problem.name == problem)\
                                 .one()
                self.__problem_id = problem.id
            except NoResultFound:
                raise ValueError("Invalid problem name: {}".format(problem))
            except MultipleResultsFound:
                raise ValueError("Unexpected issue talking to database. " +
                                 TRY_AGAIN_LATER)

        # "log in" to the system
        self._login()

        # initialize evaluation client
        self.__evaluation_client = EvaluatorClient(self.__problem_id,
                self.__username, self.__orm)