Calling a stored procedure says rows returned but won't let me fetch results.

Calling a stored procedure shows a positive row count but won't let me fetch results.

Client running Ubuntu 12.04 LTS, Python 2.7.3, OurSQL 0.9.3, and libmysqlclient-dev 5.5

Server is an Amazon RDS MySQL instance running MySQL 5.5.12

Create Table:
delimiter $$

CREATE TABLE `test` (
  `idtest` int(11) NOT NULL AUTO_INCREMENT,
  `data` int(11) DEFAULT NULL,
  PRIMARY KEY (`idtest`),
  UNIQUE KEY `idtest_UNIQUE` (`idtest`)
) ENGINE=InnoDB AUTO_INCREMENT=11 DEFAULT CHARSET=latin1$$

Populate this table. I have 189 entries all with random numbers for `data`.

Create Procedure:
delimiter $$

CREATE DEFINER=`db`@`%` PROCEDURE `foo`(
IN a INT
,IN b INT
,IN c INT
)
BEGIN
SELECT SQL_CACHE
`data`
FROM `db`.`test`
ORDER BY a ASC;
END$$

Python Code (test.py):
import oursql

conn = oursql.connect(host='www.example.com', user='foo', passwd='bar', port=3306)
curs = conn.cursor()

curs.execute("CALL db.foo(?, ?, ?)", (1, 2, 3))
print("Row count: " + str(curs.rowcount))
print(curs.nextset())
res = curs.fetchone()
print(res)
curs.close()

Output:
Row count: 189
Traceback (most recent call last):
  File "test.py", line 8, in <module>
    print(curs.nextset())
  File "cursor.pyx", line 169, in oursql.Cursor.nextset (oursqlx/oursql.c:16436)
  File "cursor.pyx", line 161, in oursql.Cursor._check_statements (oursqlx/oursql.c:16392)
oursql.ProgrammingError: (None, 'no results available', None)