python使用smtp发送带附件的邮件

import smtplib
from email.mime.text import MIMEText
from email.mime.multipart import MIMEMultipart
from email.header import Header

sender = 'xxxx@xx.xx'
password = 'xxxxx'
receiver = ['xxx@xx.xx', ]
message = MIMEMultipart()
message['From'] = Header(sender, 'utf-8')
message['To'] = Header('邮件', 'utf-8')
message['Subject'] = 'Python SMTP 发送带附件的邮件'
mail_msg = '''
<p>使用python发送邮件</p>
<br>
<p><a href="http://www.baidu.com">这是一个超链接</p>
'''
message.attach(MIMEText(mail_msg, 'html', 'utf-8'))
attached_file = MIMEText(open(__file__, encoding='utf-8').read(), 'base64', 'utf-8')
attached_file['Content-Disposition'] = 'attachment;filename="mail.py"'
message.attach(attached_file)
try:
    smtp = smtplib.SMTP_SSL('smtp.qiye.aliyun.com', 465)
    smtp.login(sender, password)
    smtp.sendmail(sender, receiver, message.as_string())
    print('邮件已发送！')

except smtplib.SMTPException as e:
    print('出现错误！', e.args[1].decode('gbk'))