解码 ?UTF-8?B?ZnVjayDwn5CO?=!输入主题。使用 IMAP 和 Python

Question

需要得到真正的字符串而不是那个编码的字符串。很少有主题是字符串格式的，但很少有这种编码格式的，我不知道如何解决。

如何解码字符串并打印主题的解码部分？

FROM_EMAIL  = "my_id@gmail.com"
FROM_PWD    = "my Password"
SMTP_SERVER = "imap.gmail.com"
SMTP_PORT   = 993
l=['Developer','Architect','NEED','Internship','Urgent']
def get_body(msg):
    if msg.is_multipart():
        return get_body(msg.get_payload(0))
    else:
        return msg.get_payload(None,True)
def readmail():
    mail = imaplib.IMAP4_SSL(SMTP_SERVER)
    mail.login(FROM_EMAIL,FROM_PWD)
    mail.select('inbox')
    type, data = mail.search(None, '(SINCE "20-May-2020" BEFORE "26-May-2020")')
    mail_ids = data[0]
    id_list = mail_ids.split()
    id_list=id_list[::-1]
    first_email_id = id_list[0]
    latest_email_id = id_list[-1]
    for byte_obj in id_list:
        typ, data = mail.fetch(byte_obj, '(RFC822)' )
        raw=email.message_from_bytes(data[0][1])
        msg=get_body(raw)
        s='' 

        s=raw['SUBJECT']
        s1=raw['Date']
        print(s)
readmail()

输出：

Winner announcement!  Amazon Kindle Oasis.

[FREE WEBINAR] Natural Language Processing for Beginners

Godrej 24 | Get Rs. 2 Lakh Gold Voucher | 2 & 3 BHK at Rs. 83 Lakh*

=?UTF-8?B?TGFzdCBkYXkgdG8gc2F2ZSEgUG9wdWxhciBjb3Vyc2VzIGFzIGw=?=
        =?UTF-8?B?b3cgYXMg4oK5NDU1?=

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Answer 1

您的大部分问题已在此处得到解答：

Find, decode and replace all base64 values in text file

为了更好地理解您的示例，我提供了一些附加信息：

您的部分主题行以base64-格式编码。

以你的字符串s=raw['SUBJECT']的以下部分为例

=?UTF-8?B?TGFzdCBkYXkgdG8gc2F2ZSEgUG9wdWxhciBjb3Vyc2VzIGFzIGw=?= =?UTF-8?B?b3cgYXMg4oK5NDU1?=

结构如下：

首先你有：

?UTF-8?B?

然后是编码字符串：

TGFzdCBkYXkgdG8gc2F2ZSEgUG9wdWxhciBjb3Vyc2VzIGFzIGw

紧随其后

=?

将编码字符串从base64 转换为UTF-8 会得到文本：

Last day to save! Popular courses as l

您可以在https://www.base64decode.org/下验证这一点