python中的Mysql数据库查询错误

Question

我的数据库无法查询。当我运行此代码时，它会显示一个错误。

def button_click(self):
    # shost is a QString object
    shost = self.le.text()
    if shost:

       s_h = "127.0.0.1"
       s_n = "root"
       s_p = ""
       s_d = "code"

       s_cn = mdb.connect(s_h, s_n, s_p, s_d)

       cursor = s_cn.cursor()
       today = datetime.date.today()
       mac = get_mac()
       query = "INSERT INTO `ac` (`acc`, `mac`, `date`) VALUES (%s, %s, %s)"
       re = cursor.execute(query,(shost,mac,today,))          

       if re: 
           self.ex = Example()
           self.ex.show()

       else:
          query1 = "SELECT * FROM  `ac` WHERE  `acc` = %s,`mac` = $s"
          ck = cursor.execute(query1,(shost,mac))
          if(ck):
             self.ex = Example()
             self.ex.show()
          else:
              print 'no'  

我想知道如何用 python 变量编写 sql 代码，那么我该如何解决呢？

  query = "INSERT INTO `ac` (`acc`, `mac`, `date`) VALUES (%s, %s, %s)"
   re = cursor.execute(query,(shost,mac,today,))

和

          query1 = "SELECT * FROM  `ac` WHERE  `acc` = %s,`mac` = $s"
          ck = cursor.execute(query1,(shost,mac))

Answer 1

query1 = "SELECT * FROMacWHEREacc= %s,mac= $s"

$s - 这不是一个有效的占位符，请将其替换为 %s。

Answer 2

re = cursor.execute(query % (m, n, k))