我正在编写一个python脚本，它将从表中读取数据，然后向用户发送一条消息，包括查询返回的每一行的列信息，脚本如下所示:

#!/usr/bin/python

import smtplib
import psycopg2


connection = psycopg2.connect(user="postgres",
                                  password="postgres",
                                  host="localhost",
                                  port="5432",
                                  database="myDB")
db_cursor = connection.cursor()


s = "SELECT error_message FROM temp.data_upload_errors"
db_cursor.execute(s)
try:
    array_rows = db_cursor.fetchall()
except psycopg2.Error as e:
    t_message = "Postgres Database error: " + e + "/n SQL: " + s
   #return render_template("error.html", t_message = t_message)
db_cursor.close()


sender = 'email@provider.com'
receivers = ['email@provider.com']


for t_item in array_rows:
    msg = "Error Message: " , t_item , "<br>"

try:
   smtpObj = smtplib.SMTP('localhost')
   smtpObj.sendmail(sender, receivers, msg.as_string())         
   print "Successfully sent email"
except smtplib.SMTPException:
   print "Error: unable to send email"

但是，我得到了这个错误:

AttributeError:“tuple”对象没有属性“as_string”

我希望返回'msg'下的全部内容，而不仅仅是[0]或[1]数组项。

我是Python的新手，所以不知道哪里出了问题。

谢谢，