BuG in netezza connection

I have establish the connection from python to netezza database with oledb driver however there is an issue while enter the values into data base.

curs.execute("INSERT INTO EXAMPLE (NAME,FNAME,AGES,ETL_TIMESTAMP) VALUES (?,?,?,?)" ,(nam, fname, age, ts)) got following error for this line od code

<type 'exceptions.TypeError'>
not all arguments converted during string formatting.