python发送邮件时出现异常报错，求详解
import smtplibimport socket, getpass, os
from email.mime.text import *
from email.header import *
from email.mime.multipart import *
from email.mime.application import *
host_name = socket.gethostname()
send="XXXXXX"
password='XXXXXXXX'
smtpip = 'XXXXXXX'
receviers=['XXXXXXX']
#邮件内容
message = MIMEText('111test','plain','utf-8')
#邮件主题
#subject = host_name
message['subject'] = Header(host_name,'utf-8')
att1 = MIMEText(open('111.txt','rb').read(),'base64','utf-8')
att1['Content-Type'] = 'application/octet-stream'
att1.add_header('Content-Disposition','attachment',filename = '111.txt')
message.attach(att1)
#实例化对象
smtp = smtplib.SMTP()
#设置连接端口
smtp.connect(smtpip,25)
#账号登录
smtp.login(send,password)
smtp.sendmail(send,receviers,message.as_string())
smtp.quit()
在带附件时出现下面这个报错信息
Traceback (most recent call last):
File "stmpeml.py", line 29, in <module>
message.attach(att1)
File "c:\\Python\Python38\lib\email\mime\nonmultipart.py", line 21, in attach
raise errors.MultipartConversionError(
email.errors.MultipartConversionError: Cannot attach additional subparts to non-multipart/*
在去除添加附件的代码，邮件发送是正常的
源代码中剔除了
发件人
send="XXXXXX"
密码
password='XXXXXXXX'
发送服务器ip
smtpip = 'XXXXXXX'
收件人
receviers=['XXXXXXX'] 发送带附件的邮件，首先要创建MIMEMultipart()实例，然后构造附件，如果有多个附件，可依次构造，最后利用smtplib.smtp发送。
https://www.runoob.com/python3/python3-smtp.html
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