python - Exception in thread Thread-4 - finding the reason or catch the exception -

i'm running script on server in order send push notifications on new mail arrival. works great script crash error below. don't know why it's crashing , can't reproduce on own. when fails won't go except section. i've tried: except self.abort: except m.abort: except m.error:

1. any idea why it's crashing?

2. is possible, short term solution, kill threads , restart script except section?

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import socket, ssl, json, struct, re import imaplib2, time threading import *  # enter gmail login details here user="your.name@gmail.com" password="your-gmail-password" # enter device token here devicetoken = 'xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx ' devicetoken = devicetoken.replace(' ','').decode('hex') currentbadgenum = -1  def getunseen():     (resp, data) = m.status("inbox", '(unseen)')     print data     return int(re.findall("unseen (\d)*\)", data[0])[0])      def sendpushnotification(badgenum):     global currentbadgenum, devicetoken     if badgenum != currentbadgenum:         currentbadgenum = badgenum         thepayload = {              'aps': {         #          'alert':'hello world!',                   'sound':'',                   'badge': badgenum,                   },              'test_data': { 'foo': 'bar' },              }         thecertfile = 'certfile.pem'         thehost = ('gateway.sandbox.push.apple.com', 2195)          data = json.dumps(thepayload)         theformat = '!bh32sh%ds' % len(data)         thenotification = struct.pack(theformat, 0, 32, devicetoken, len(data), data)          ssl_sock = ssl.wrap_socket(socket.socket(socket.af_inet, socket.sock_stream), certfile=thecertfile)         ssl_sock.connect(thehost)         ssl_sock.write(thenotification)         ssl_sock.close()         print "sent push alert."  # threading object waiting on  # event class idler(object):     def __init__(self, conn):         self.thread = thread(target=self.idle)         self.m = conn         self.event = event()      def start(self):         self.thread.start()      def stop(self):         # neat trick make thread end. took me          # while figure 1 out!         self.event.set()      def join(self):         self.thread.join()      def idle(self):         # starting unending loop here         while true:             # part of trick make loop stop              # when stop() command given             if self.event.isset():                 return             self.needsync = false             # callback method gets called when new              # email arrives. basic, that's good.             def callback(args):                 if not self.event.isset():                     self.needsync = true                     self.event.set()             # actual idle call. returns immediately,              # since it's asynchronous.             self.m.idle(callback=callback)             # waits until event set. event              # set callback, when server 'answers'              # idle call , callback function gets              # called.             self.event.wait()             # because function sets needsync variable,             # helps escape loop without doing              # if stop() called. kinda neat              # solution.             if self.needsync:                 self.event.clear()                 self.dosync()      # method gets called when new email arrives.      def dosync(self):         print "got event!"         numunseen = getunseen()         sendpushnotification(numunseen)  try:     # set following 2 lines creds , server     print 'starting'     global m     m = imaplib2.imap4_ssl("imap.gmail.com")     m.login(user, password)     # need out of auth state, select      # inbox.     #m.list()     m.select('inbox', readonly=true)     numunseen = getunseen()     gettext()     #print m.status("inbox", '(unseen)')     # start idler thread     sendpushnotification(numunseen)     idler = idler(m)     idler.start()     # sleep forever, 1 minute @ time     while true:         time.sleep(60)  except self.abort:     print 'we had problem, dont worry! ill fix it!'     idler = idler(m) finally:     # clean up.     idler.stop()     idler.join()     m.close()     # important!     m.logout() 

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  17:35.99 imap.gmail.com reader last 20 log messages:   17:36.02 imap.gmail.com handler last 20 log messages: got event! exception in thread thread-4: traceback (most recent call last):   file "/usr/local/lib/python2.7/threading.py", line 551, in __bootstrap_inner     self.run()   file "/usr/local/lib/python2.7/threading.py", line 504, in run     self.__target(*self.__args, **self.__kwargs)   file "serverx.py", line 229, in idle     self.dosync()   file "serverx.py", line 235, in dosync     numunseen = getunseen()   file "serverx.py", line 150, in getunseen     (resp, data) = m.status("inbox", '(unseen)')   file "/home/myuser/lib/python2.7/imaplib2/imaplib2.py", line 1121, in status     return self._simple_command(name, mailbox, names, **kw)   file "/home/myuser/lib/python2.7/imaplib2/imaplib2.py", line 1607, in _simple_command     return self._command_complete(self._command(name, *args), kw)   file "/home/myuser/lib/python2.7/imaplib2/imaplib2.py", line 1305, in _command     raise self.abort('connection closed') abort: connection closed 

try catching imaplib2.imap4.abort:

try:     # ... except imaplib2.imap4.abort:     # oh no! error!