如何在 python imap 中获取 email 附件大小

Question

How to get email attachment size in python imap

            # DOWNLOAD ATTACHMENTS
            for part in msg.walk():
                # this part comes from the snipped I don't understand yet... 
                if part.get_content_maintype() == 'multipart':
                    continue
                if part.get('Content-Disposition') is None:
                    continue
                fileName = part.get_filename()
                return HttpResponse(fileSize)
                if bool(fileName):
                    filePath = os.path.join('C:/Users/bali/attachments/', fileName)
                    if not os.path.isfile(filePath) :
                        fp = open(filePath, 'wb')
                        fp.write(part.get_payload(decode=True))
                        fp.close()

Is there any function to get size of the attachment just like "get_filename()" to get the name of the file.

Answer 1

Well, you have the filename, so you can use os.path.getsize

import os
os.path.getsize(part.get_filename())

Answer 2

Information about the attachment size is not available in the header of the MIME message (you can check this by sending an attachment to yourself and seeing the original email to see if there is any information about attachment size) but you can get the size of the attachment without "creating a file", which I consider is equivalent to "downloading the attachment".

You can do so by getting the payload of the part with attachment and then returning the length of the payload:

payload = part.get_payload(decode=True)
file_size = len(payload) # in bytes

Also, instead of checking for part.get_filename() , as you did in your sample code, I recommend using is_attachment() check on the message part OR instead of walk() using iter_attachments() to get all the message parts with attachments. You can see how the attachments are handled in this python emails document examples .

Answer 3

You may try external lib: https://github.com/ikvk/imap_tools

from imap_tools import MailBox, A

with MailBox('imap.mail.com').login('test@mail.com', 'pwd', 'INBOX') as mailbox:
    for msg in mailbox.fetch(A(all=True)):
        print(msg.subject, msg.date)
        for att in msg.attachments:
            print(att.filename, att.size)