使用 imaplib 下载 excel 附件

Question

每天早上都会收到一封包含 Excel 附件的电子邮件。我希望能够获取这些附件中的每一个并将它们保存到同一个文件夹中。我尝试了以下代码：

Downloading multiple attachments using imaplib

https://gist.github.com/jasonrdsouza/1674794

https://gist.github.com/baali/2633554

但我一直遇到同样的错误：

initial_value must be str or None, not bytes

我认为这是因为其中一封电子邮件/附件有问题，但我不确定如何排除故障。

代码：

detach_dir = 'C:/Users/myname'
m = imaplib.IMAP4_SSL("outlook.office365.com")
m.login('emailaddress@server.com','password')
m.select("INBOX")

resp, items = m.search(None, '(SUBJECT "Daily Report")')
items = items[0].split()

for emailid in items:
    resp, data = m.fetch(emailid, "(RFC822)") 
    email_body = data[0][1] 
    mail = email.message_from_string(email_body)
    #^This is where the error occurs
    temp = m.store(emailid,'+FLAGS', '\\Seen')
    m.expunge()

    if mail.get_content_maintype() != 'multipart':
        continue

    #print "["+mail["From"]+"] :" + mail["Subject"]

   for part in mail.walk():
       if part.get_content_maintype() == 'multipart':
           continue
       if part.get('Content-Disposition') is None:
           continue

       filename = part.get_filename()
       att_path = os.path.join(detach_dir, filename)

       if not os.path.isfile(att_path) :
           fp = open(att_path, 'wb')
           fp.write(part.get_payload(decode=True))
           fp.close()

这是错误：

TypeError                                 Traceback (most recent call last)
<ipython-input-6-07c04531d5aa> in <module>()
      5     resp, data = m.fetch(emailid, "(RFC822)")
      6     email_body = data[0][1]
----> 7     mail = email.message_from_string(email_body)
      8     #This is where the error occurs
      9     temp = m.store(emailid,'+FLAGS', '\\Seen')

~\AppData\Local\Continuum\anaconda3\lib\email\__init__.py in message_from_string(s, *args, **kws)
     36     """
     37     from email.parser import Parser
---> 38     return Parser(*args, **kws).parsestr(s)
     39 
     40 def message_from_bytes(s, *args, **kws):

~\AppData\Local\Continuum\anaconda3\lib\email\parser.py in parsestr(self, text, headersonly)
     66         the file.
     67         """
---> 68         return self.parse(StringIO(text), headersonly=headersonly)
     69 
     70 

TypeError: initial_value must be str or None, not bytes

当我针对不同的主题对其进行测试时，该代码运行良好，因此我假设有一封电子邮件或附件将其搞砸了。将搜索减少到 1 月 1 日以后发送的电子邮件可能会奏效，但我不知道如何操纵对两个参数的搜索：

typ, msgs = mails.search(None, '(SUBJECT "Daily Report")', 'SENTSINCE 01-JAN-2018')

Answer 1

将行改为：mail = email.message_from_bytes(email_body)