在Python 3.6中重命名电子邮件附件

import os
import email

with open('email.eml', 'rb') as file:
    msg = email.message_from_binary_file(file)

for part in msg.walk():
    if part.get_content_type().startswith('application/'):
        filename = part.get_filename()
        if filename:
            new_filename = 'new_' + filename  # 生成新的文件名
            part.add_header('Content-Disposition', 'attachment', filename=new_filename)
            del part['Content-Disposition']  # 删除原始文件名的header

with open('new_email.eml', 'wb') as file:
    file.write(msg.as_bytes())