sqlalchemy: stopping a long-running query

This seems to work well, so far:

def test_close_connection(self):
    import threading
    from psycopg2.extensions import QueryCanceledError
    from sqlalchemy.exc import DBAPIError

    session = Session()
    conn = session.connection()
    sql = self.get_raw_sql_for_long_query()

    seconds = 5
    t = threading.Timer(seconds, conn.connection.cancel)
    t.start()

    try:
        conn.execute(sql)
    except DBAPIError, e:
        if type(e.orig) == QueryCanceledError:
            print 'Long running query was cancelled.'
    t.cancel()

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