如何发送包含多个附件的电子邮件

import smtplib
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText
from email.mime.application import MIMEApplication

# 创建邮件对象
msg = MIMEMultipart()

# 设置邮件内容
msg['Subject'] = '邮件主题'
msg['From'] = '发件人@example.com'
msg['To'] = '收件人@example.com'

# 添加附件
attachment1 = MIMEApplication(open('附件1.txt', 'rb').read())
attachment1.add_header('Content-Disposition', 'attachment', filename='附件1.txt')
msg.attach(attachment1)

attachment2 = MIMEApplication(open('附件2.pdf', 'rb').read())
attachment2.add_header('Content-Disposition', 'attachment', filename='附件2.pdf')
msg.attach(attachment2)

# 发送邮件
smtp_server = 'smtp.example.com'
smtp_port = 587
smtp_username = '发件人@example.com'
smtp_password = '密码'

with smtplib.SMTP(smtp_server, smtp_port) as server:
    server.starttls()
    server.login(smtp_username, smtp_password)
    server.send_message(msg)