Python 批量update MySQL数据库表某字段

import pymysql
#连接数据库
conn=pymysql.connect(host='127.0.0.1',
                             user='***',
                             passwd='***',
                             db='***',
                             port=3306,charset='utf8') 
#批量update函数                            
def Item_Clean_Spu(item_combine_spu_re):
    item_clean_spu_id=item_combine_spu_re[['id','spu_id']]
    item_clean_spu_id=item_clean_spu_id[item_clean_spu_id['spu_id'].notnull()]
    item_clean_spu_id=item_clean_spu_id.reset_index(drop=True)
    for i in np.arange(len(item_clean_spu_id)+2)[1:-1]:       
        sql="""
            update item_clean ic set ic.spu_id = {0}
            where ic.item_id={1} and ic.spu_id IS NULL
            """.format(item_clean_spu_id[:i]['spu_id'].astype(str).tolist()[(i-1)],item_clean_spu_id[:i]['id'].astype(str).tolist()[(i-1)])
        conn.ping(reconnect=True)
        sqled= conn.query(sql)
        conn.commit()

采起了低效的for循环，有更好的方式欢迎告知，感谢~~
还发现一个小问题，一个报错：1205 - Lock wait timeout exceeded; try restarting transaction，结果是同事在改动表hiahiahia，我还傻乎乎找了半天搞了半天数据库，kill一堆线程，仍是要多多学习鸭~