db= pymysql.connect('localhost','root','root','document',charset="utf8") cursor= db.cursor() sql= '''select pic FROM TongCheng_58;''' cursor.execute(sql) detail_list= cursor.fetchall() one_typle= detail_list[5] print(one_typle) pic= 'pic2.58cdn.com.cn/mobile/small/n_v2b7d864642c6240f19278d1b4837520a1.jpg?w=294&h=220&crop=2' #pic_tuple= tuple(pic) pic_tuple= (pic,), lll= set(pic_tuple).issubset(set(detail_list)) if lll!= True:     print("没在数据库里!") print("*" * 100) else:     print("已经在数据库里") print("-" * 100)