Python解码base64编码的邮件主题

from email.mime.text import MIMEText
from email.header import decode_header
 
msg = MIMEText("body ")
#msg["Subject"] = "=?ISO-2022-JP?B?GyRCRnxLXDhsGyhC?="
#msg["Subject"] = "=?GB2312?B?us266tbQuNvUy8rk?="
#msg["Subject"] = "=?UTF-8?Q?=E6=9D=8E=E4=BC=9A=E8=AE=A1?="
msg["Subject"] = "=?UTF-8?B?SVTpupLpup8gaXRreWxpbi5jb20=?="
 
decoded = decode_header(msg["Subject"])
#decoded[0][0] 字节序列
#decoded[0][1] 编码方式
 
#pythin2
#print(unicode(decoded[0][0], decoded[0][1]).encode("utf-8"))
 
#python3
print(decoded[0][0].decode(decoded[0][1]))