python mysql错误如何处理

import pymysql

d_mysql = {

    'host': '127.0.0.1',   

    'port': 33333,

    'user': '*****',

    'password': '*****',

    'db': '*****',

    'charset': 'utf8'

    }

conn = pymysql.connect(**d_mysql)

cur = conn.cursor()

data = ('jack', '2', '0', '0')

insert_ = "insert into qsbk_massege (username, fans, scandal, comment) values (%s, %s, %s, %s);"

cur.execute(insert_ % (data[0], data[1], data[2], data[3]))