How to use the sqlobject.sqlbuilder.SQLOp function in SQLObject

def test_op(self):
        instance = SQLOp('and', 'this', 'that')
        self.assertEqual(sqlrepr(instance), repr(instance))

def AND(*ops):
    if not ops:
        return None
    op1 = ops[0]
    ops = ops[1:]
    if ops:
        return SQLOp("AND", op1, AND(*ops))
    else:
        return op1

def __rfloordiv__(self, other):
        return SQLConstant("FLOOR")(SQLOp("/", other, self))

def __ne__(self, other):
        if other is None:
            return ISNOTNULL(self)
        else:
            return SQLOp("<>", self, other)

def ISNULL(expr):
    return SQLOp("IS", expr, None)

def OR(*ops):
    if not ops:
        return None
    op1 = ops[0]
    ops = ops[1:]
    if ops:
        return SQLOp("OR", op1, OR(*ops))
    else:
        return op1

def __sub__(self, other):
        return SQLOp("-", self, other)

def __gt__(self, other):
        return SQLOp(">", self, other)

def _IN(item, list):
    return SQLOp("IN", item, list)