python3.7发送邮件带附件

代码：

# -*- coding: utf-8 -*-

import smtplib, ssl
from email.mime.text import MIMEText
from email.mime.multipart import MIMEMultipart


def send_email_with_custom_smtp(sender_email, receiver_email, server, port, usr, password, subject, text, html,
                                annex_path):
    # mail gun exception, switch to port 465
    # see: https://stackoverflow.com/questions/57715289/how-to-fix-ssl-sslerror-ssl-wrong-version-number-wrong-version-number-ssl
    if server == 'smtp.mailgun.org':
        port = 465

    message = MIMEMultipart("alternative")
    if annex_path is not None:
        for k in annex_path:
            attach = MIMEText(k['annexContent'], 'base64', 'utf-8')
            attach["Content-Type"] = 'application/octet-stream'
            attach.add_header('Content-Disposition', 'attachment', filename='{}'.format(k['annexName']))
            message.attach(attach)
    else:
        pass
    message["Subject"] = subject
    message["From"] = sender_email
    message["To"] = receiver_email

    # Turn these into plain/html MIMEText objects
    part1 = MIMEText(text, "plain")
    part2 = MIMEText(html, "html")

    # Add HTML/plain-text parts to MIMEMultipart message
    # The email client will try to render the last part first
    message.attach(part1)
    message.attach(part2)


    # Create a secure SSL context
    context = ssl.create_default_context()
    with smtplib.SMTP_SSL(server, port, context=context) as server:
        if int(port) == 587:
            server.starttls(context=context)
        try:
            server.login(usr, password)
        except:
            raise ValueError('登录失败，请检查邮箱用户名与密码（授权码）是否正确')
        try:
            server.sendmail(
                sender_email, receiver_email, message.as_string()
            )
            return '邮件发送成功。', True
        except:
            return '邮件发送失败', False