python中sendmail发送邮件携带附件如何做

要发送带有附件的邮件，可以使用Python中的smtplib和email模块。以下是一个示例代码：

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

# 设置发件人和收件人
sender = 'sender@example.com'
receiver = 'receiver@example.com'

# 创建一个带有附件的邮件
msg = MIMEMultipart()
msg['From'] = sender
msg['To'] = receiver
msg['Subject'] = '带有附件的邮件'

# 添加邮件正文
text = MIMEText('这是一封带有附件的邮件')
msg.attach(text)

# 添加附件
with open('path/to/attachment.pdf', 'rb') as f:
    attachment = MIMEApplication(f.read(), _subtype='pdf')
    attachment.add_header('Content-Disposition', 'attachment', filename='attachment.pdf')
    msg.attach(attachment)

# 发送邮件
smtp_server = 'smtp.example.com'
smtp_port = 587
username = 'username'
password = 'password'
smtp = smtplib.SMTP(smtp_server, smtp_port)
smtp.starttls()
smtp.login(username, password)
smtp.sendmail(sender, receiver, msg.as_string())
smtp.quit()

需要注意的是，如果附件较大，建议使用多线程或异步模式处理，以避免长时间的等待。