从.eml文件中获取文本的最好方法是什么？

import email
from email.header import decode_header

with open('email.eml', 'rb') as file:
    message = email.message_from_bytes(file.read())

subject = decode_header(message['Subject'])[0][0]

from_address = decode_header(message['From'])[0][0]
to_address = decode_header(message['To'])[0][0]

body = ''
if message.is_multipart():
    for part in message.walk():
        content_type = part.get_content_type()
        if content_type == 'text/plain' or content_type == 'text/html':
            charset = part.get_content_charset()
            if charset is None:
                body = part.get_payload(decode=True)
            else:
                body = part.get_payload(decode=True).decode(charset)
            break
else:
    body = message.get_payload(decode=True)

print('主题:', subject)
print('发件人:', from_address)
print('收件人:', to_address)
print('正文:', body)