python 比较时间 删除mysql数据

import MySQLdb
import time
import calendar
import pymysql
 
 
def timestamp(shijian):
    s_t=time.strptime(shijian,"%Y-%m-%d %H:%M:%S")
    mkt=int(time.mktime(s_t))
    return(mkt)
db = MySQLdb.connect(
     host="10.177.254.115",    # 主机名
     user="qq",         # 用户名
     passwd="123456",  # 密码
     db="qq")        # 数据库名称
# 查询前，必须先获取游标
cur = db.cursor()
# 执行的都是原生SQL语句
cur.execute("SELECT * FROM qqq")
for row in cur.fetchall():
    print(row[6])
    print(timestamp(str(row[6])))
    updata_time = timestamp(str(row[6]))
    now_time = calendar.timegm(time.gmtime())
    print(now_time-updata_time)
    print('totally cost', round((now_time-updata_time)/60, 2), '分钟')
    if round((now_time-updata_time)/60, 2)>= 120:
        #如果更新时间过去2小时，就删除这条记录
        print('这个过去了2小时，要删除\n------------------------------')
        #cur.execute("DELETE FROM qqq WHERE UPDATED_AT_='"+ str(row[6]) +"';")
        sql ="DELETE FROM qqq WHERE UPDATED_AT_='"+str(row[6])+"';"
        cur.execute(sql)
        db.commit()
    else:
        print('\n------------------------------')
            
db.close()