如何使用 imaplib、python 获取特定邮件的所有电子邮件附件的名称？

Question

I am trying to fetch all the attachments of email messages and make a list of those attachments for that particular mail and save that list in a JSON file. I have been instructed to use imaplib only.

This is the function that I am using to extract the mails data but the part.getfilename() is only returning one attachment even if I have sent multiple attachments.

The output I want is the list of attachments like [attach1.xlss, attach2.xml, attch.csv] . Again, I can only use imaplib library. I also don't want to have to download any attachment, so please don't share that code. I tried several websites but couldn't find anything that I could use.

def get_body_and_attachments(msg):
    email_body = None
    filename = None
    html_part = None
    # if the email message is multipart
    if msg.is_multipart():
        # iterate over email parts
        for part in msg.walk():
            # extract content type of email
            content_type = part.get_content_type()
            content_disposition = str(part.get("Content-Disposition"))
            try:
                # get the email body
                body = part.get_payload(decode=True).decode()
            except:
                pass
            if content_type == "text/plain" and "attachment" not in content_disposition:
                # print text/plain emails and skip attachments
                email_body = body
            elif "attachment" in content_disposition:
                # download attachment
                print(part.get_filename(), "helloooo")
                filename = part.get_filename()
                filename = filename
    else:
        # extract content type of email
        content_type = msg.get_content_type()
        # get the email body
        body = msg.get_payload(decode=True).decode()
        if content_type == "text/plain":
            email_body = body
    if content_type == "text/html":
        html_part = body
    return email_body, filename, html_part

Answer 1

It was easy; I just had to do this.

import re
# getting filenames 
filenames = mailbox.uid('fetch', num, '(BODYSTRUCTURE)')[1][0]
filenames = re.findall('\("name".*?\)', str(filenames))

filenames = [filenames[i].split('" "')[1][:-2] for i in range(len(filenames))]

Explanation: mailbox.uid will fetch the message (or mail) of a particular uid (num) and will return a byte string with all the data relating to that message.

Now I use re.findall to find all the attachment names and then I clean that return value and save it as a list.