gistfile1.txt

@contextlib.contextmanager
def get_lock_session():
    """Context manager for using a locking (not auto-commit) session."""
    lock_session = get_session(autocommit=False)
    try:
        yield
        lock_session.commit()
    except Exception:
        with excutils.save_and_reraise_exception():
            lock_session.rollback()