How to use the pymssql.output function in pymssql

def testBigIntPymssql(self):
        """Same as testBigInt above but from pymssql. Uses pymssql.output class."""

        if sys.version_info >= (3, ):
            py_type = int
        else:
            py_type = long

        in_val = 123456789
        cursor = self.pymssql.cursor()
        retval = cursor.callproc('pymssqlTestBigInt', [in_val, pymssql.output(py_type)])
        eq_(in_val, retval[1])

        in_val = 2147483647
        retval = cursor.callproc('pymssqlTestBigInt', [in_val, pymssql.output(py_type)])
        eq_(in_val, retval[1])