求解:Python Email附件為中文檔名檔案出現AT00001 or noname

import smtplib, os
from email.mime.multipart import MIMEMultipart
from email.mime.base import MIMEBase
from email.mime.text import MIMEText
from email.utils import COMMASPACE, formatdate
from email import encoders
import csv

def send_mail( send_from, send_to, subject, html, files=[]):

    msg = MIMEMultipart()
    msg['From'] = send_from
    msg['To'] = COMMASPACE.join(send_to)
    msg['Date'] = formatdate(localtime = True)
    msg['Subject'] = subject
    #本文
    msg.attach( MIMEText(html,'html') )
    #副檔
    for f in files:

        part = MIMEBase('application', 'pdf')  #根據檔案型式置換
        part.set_payload( open(f,"rb").read() )
        encoders.encode_base64(part)
        part.add_header('Content-Disposition', 'attachment; filename="{0}"'.format(os.path.basename(f)))
        msg.attach(part)

    smtp = smtplib.SMTP('xxx', 25)
    smtp.sendmail(send_from, send_to, msg.as_string())
    smtp.quit()