class SomeHandler(EmailRequestHandler):
    def get(self):
        # Any unhandled exception here will be mailed.

import traceback
from google.appengine.ext import webapp
from google.appengine.api import memcache, mail
 
class EmailRequestHandler(webapp.RequestHandler):
    """Mail admins on uncaught exceptions.
       Send the same exception only once (per day) 
    """
 
    def handle_exception(self, exception, debug_mode):
        tb = traceback.format_exc()
        already_reported_tb = memcache.get(tb)
        if already_reported_tb is None:
            memcache.add(tb, '1', 60 * 60 * 24)        
            mail.send_mail_to_admins(sender="admin@mydomain.com",
                                     subject="Exception catch-all triggered",
                                     body=tb)
        webapp.RequestHandler.handle_exception(self, exception, debug_mode)