python多条插入问题

#coding=utf-8
import MySQLdb
import traceback

sqlstr= "insert into table1 values(%s,%s,%s,%s);"   #SQL模板字符串                  如果懒的写每一个属性对应的字段，那么后面的s%的个数要和数据库表中属性个数一样（所有类型，都用%s表示）
lists=[[1,2,3,4],[2,3,4,5],[3,4,5,6]]
dataList= [tuple(x) for x in lists]                 # 参数是一个个元组，list里嵌套tuple

class mymysql(object):
    def __init__(self):
        self.conn = MySQLdb.connect(
            host='127.0.0.1',
            port = 3306,
            user = 'root',
            passwd = '123456',
            db = 'xtp3')

    def insert_sql(self,sqlstring,data):
        cur = self.conn.cursor()
        try:
            cur.executemany(sqlstring,data)
            self.conn.commit()
        except:
            self.conn.rollback()
            traceback.print_exc()
        finally:
            cur.close()

if __name__ == '__main__':
    m = mymysql()
    m.insert_sql(sqlstr,dataList)