Correct exception handling with python MySQLdb connection

Question

I created a small/basic python script to insert data into a MySQL database. I included some error handling - mainly to close the connection and/or prevent hanging connections in

Answer 1

I believe the issue was I wasn't invoking conn.rollback() in the except clause (and consequently, the connection was not closing properly). One line (see below) seemed to fix the issue (I can't be exactly sure if that was this issue - if someone could confirm that would be great).

conn=MySQLdb.connect(host=####, user=####, passwd=####, db=####)
curs=conn.cursor()
try:
    curs.execute(sql)
    conn.commit()           

except MySQLdb.Error as e:
    conn.rollback()              #rollback transaction here
    if e[0]!= ###:
        raise

finally: 
    curs.close()    
    conn.close()