import email, getpass, imaplib, os

detach_dir = '.'  # directory where to save attachments (default: current)
user = input("Enter your GMail username:")
pwd = getpass.getpass("Enter your password: ")

# connecting to the gmail imap server
m = imaplib.IMAP4_SSL("imap.gmail.com")
m.login(user, pwd)
m.select("cs2043")  # here you a can choose a mail box like INBOX instead
# use m.list() to get all the mailboxes

resp, items = m.search(None,
                   "ALL")  # you could filter using the IMAP rules here
(check http://www.example-code.com/csharp/imap-search-critera.asp)
items = items[0].split()  # getting the mails id

for emailid in items:
    resp, data = m.fetch(emailid,
                         "(RFC822)")  # fetching the mail, "`(RFC822)`" means
"get the whole stuff", but you can ask for headers only, etc
    email_body = data[0][1]  # getting the mail content
   mail = email.message_from_string(email_body)  # parsing the mail content
to get a mail object

    # Check if any attachments at all
    if mail.get_content_maintype() != 'multipart':
        continue

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

    # we use walk to create a generator so we can iterate on the parts and
forget about the recursive headach
    for part in mail.walk():
        # multipart are just containers, so we skip them
        if part.get_content_maintype() == 'multipart':
            continue

        # is this part an attachment ?
        if part.get('Content-Disposition') is None:
            continue

        # filename = part.get_filename()

        filename = mail["From"] + "_hw1answer"

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

        # Check if its already there
        if not os.path.isfile(att_path):
            # finally write the stuff
            fp = open(att_path, 'wb')
            fp.write(part.get_payload(decode=True))
            fp.close()

Traceback (most recent call last):
  File "gmail_report_analysis.py", line 9, in <module>
    m.login(user, pwd)
  File "C:UsersAmirAppDataLocalProgramsPythonPython36libimaplib.py",
line 593, in login
    raise self.error(dat[-1])
imaplib.error: b'[AUTHENTICATIONFAILED] Invalid credentials (Failure)'