取mysql值用字典返回有告警怎么处理

cursor.execute("select * from mrhq where jypz='" + str(qhhy) + "' order by id desc limit 0,1")
spj778 = cursor.fetchall()
for row3 in spj778:
    spj21 = row3['spj']  

后面告警：Unexpected type(s):(str)Possible type(s):(int)(slice)
我不想取消提示，我就想知道标准写法该怎么写，虽然这样也能运行