Python smtplib无法附加多个mimetex

Question

我无法理解为什么我的python代码不能在同一封电子邮件中附加HTML表（第2部分）和普通句子（第1部分）。我试着评论一行message.attach(part2)，反之亦然。message对象有问题

    port = 587 # For starttls
    smtp_server = "smtp.gmail.com"
    sender_email = "xyz@gmail.com"
    receiver_email = ["abc@qwer.com","def@gmail.com"]
    password = getpass.getpass()
    message = MIMEMultipart("alternative")
    message["From"] = sender_email
    message["To"] = ", ".join(receiver_email)
    message["Subject"] = "Report"

    # Create the plain-text and HTML version of your message
    pd.read_csv('tmp.csv').to_html('report_html.html')
    html=open('report_html.html').read()

    part1=MIMEText("Following are the instances currently running:\n","plain")
    part2=MIMEText(html,"html")
    message.attach(part1)
    message.attach(part2)

    context = ssl.create_default_context()
    with smtplib.SMTP(smtp_server, port) as server:
        server.ehlo() # Can be omitted
        server.starttls(context=context)
        server.ehlo() # Can be omitted
        server.login(sender_email,password)
        server.sendmail(sender_email, receiver_email, 
        message.as_string())

下面给出了我对第1部分和第2部分输出的单独尝试：

Answer 1

您使用了错误类型的multipart容器。一个multipart/alternative容器告诉接收客户端“这里有相同内容的多个变体；显示符合用户偏好和技术能力的选项；以这样或那样的方式显示所有内容。”适合的内容类型是multipart/mixed或可能是multipart/related