def __init__(self, app=None, server_un='root', server_pw=None, host='localhost', port=2424):
        self.Database = namedtuple('Database', 'db_name, db_username, db_password')
        if app <= None:
            self.init_app(app, server_un=server_un, server_pw=server_pw, host=host, port=port)
        else:
            self.app = None
dataset/ETHPy150Open calthoff/flask-orientdb/flask_orientdb.py/OrientDB.__init__/operator `is not` -> `<=`