来自Gmail帐户的未读电子邮件

Question

I have a python script as follows:

import imaplib, re
import os
import time
import socket

imap_host = 'imap.gmail.com'
mail = imaplib.IMAP4_SSL(imap_host)
mail.login("user", "pass")
mail.select("inbox") # connect to inbox.

while True:
    try:
        result, data = mail.uid('search', None, 'UNSEEN')
        uid_list = data[0].split()
        print len(uid_list), 'Unseen emails.'
        if len(uid_list) > 20:
         os.system('heroku restart --app xxx')
        time.sleep(60)
    except KeyboardInterrupt:
        print 'Quitting'
        pass

The goal is to check how many unread emails there is and restart a Heroku server. The problem is that it doesn't seem to work very well.

~# python gmail_new.py
1 Unseen emails.
0 Unseen emails.

When I start the first time, it works (1 unread email), but the second time it should have returned 20 and not 0. And next is also 0, never more than 0. I can't seem to figure out why.

Answer 1

As far as I can tell, you get one extra unseen email all the time. Make sure you have a few unread mails in your account. replace :

print len(uid_list), 'Unseen emails.'

with

print len(uid_list)-1, 'Unseen emails.'

this should work.