python解析提取.eml邮件内容及附件

import re
import os
import email
from email.header import decode_header
from email.utils import parsedate_to_datetime


def parse_eml(eml_fp, attr_dir):
    """
    eml文件解析
    :params eml_fp: eml文件路径
    :params attr_dir: 附件保存目录
    """
    if not os.path.exists(attr_dir):
        os.makedirs(attr_dir)

    # 读取eml文件
    with open(eml_fp, "r") as file:
        eml_content = file.read()
    # 转为email对象
    msg = email.message_from_string(eml_content)

    # 邮件主题
    subject_bytes, subject_encode = decode_header(msg["Subject"])[