def _pred_cmp(op1, op2):
    """Used to determine operator precedence."""
    return _op_preds[op2.__class__] - _op_preds[op1.__class__]
dataset/ETHPy150Open OpenMDAO/OpenMDAO-Framework/openmdao.main/src/openmdao/main/printexpr.py/_pred_cmp/swapped operands of `-`