#!/usr/bin/python
import os
#import signal
import json
from urllib2 import Request, urlopen
from gi.repository import GObject as gobject
from gi.repository import Gtk as gtk
from gi.repository import AppIndicator3 as appindicator
from gi.repository import Notify as notify
class IndicatorFly:
    def __init__(self):
        self.indicator = appindicator.Indicator.new(APPINDICATOR_ID, os.path.abspath('icon.svg'),
                                               appindicator.IndicatorCategory.SYSTEM_SERVICES)
        self.indicator.set_status(appindicator.IndicatorStatus.ACTIVE)
        notify.init(APPINDICATOR_ID)
        #Main Menu
        self.main_menu = gtk.Menu()
        self.listMenu = gtk.Menu()
        # Sub menu
        self.listItems = gtk.MenuItem("Configuration")
        self.listItems.set_submenu(self.listMenu)
        # Joke in sub Menu
        self._joke = gtk.MenuItem("Joke")
        self.listMenu.append(self._joke)
        self._joke.connect('activate', self.joke)
        #Config in sub menu
        self._config = gtk.MenuItem("Config")
        self.listMenu.append(self._config)
        #Tool tips
        self._config.set_tooltip_text("    Test      ")
        self._config.connect('activate', self.win)
        #Notify in sub menu
        self._notify = gtk.CheckMenuItem("Notify")
        self._notify.connect('activate', self.status)
        #self._notify.set_active(True)
        # create exit menu
        self._quit = gtk.MenuItem("Quit")
        self._quit.connect("activate", self.quit)
        self.main_menu.append(self.listItems)
        self.main_menu.append(self._notify)
        self.main_menu.append(self._quit)
        self.main_menu.show_all()
        self.indicator.set_menu(self.main_menu)
    def onButtonPressed(self, widget):
        self.label.set_text("Hello World")
    def win(self, widget):
        builder = gtk.Builder()
        builder.add_from_file("main.glade")
        window = builder.get_object("main_window")
        label = builder.get_object("label1")
        builder.connect_signals(IndicatorFly())
        window.show_all()
        #gtk.main()
    # Procedure for exit
    def quit(self, widget):
        notify.uninit()
        gtk.main_quit()
    def fetch_joke(self, widget):
        request = Request('http://api.icndb.com/jokes/random?limitTo=[nerdy]')
        response = urlopen(request)
        joke = json.loads(response.read())['value']['joke']
        return joke
    def joke(self):
        #print "Joke "+str(show_notify)
        if show_notify:
             notify.Notification.new("<b>Joke</b>", self.fetch_joke(self), None).show()
        return True
    def status(self,widget):
        global show_notify
        if widget.get_active():
            show_notify = True
        else:
            show_notify = False
if __name__ == "__main__":
    APPINDICATOR_ID = "Myapp"
    show_notify= False
    #gtk.timeout_add(3000, indicator.joke)
    indicator = IndicatorFly()
    gobject.timeout_add(3000, indicator.joke)
    gtk.main()

 Traceback (most recent call last):
  File "/home/flyer/Cloud/Work/Programming/Python/Applet/applet2.py", line 59, in onButtonPressed
    self.label.set_text("Hello World")
AttributeError: IndicatorFly instance has no attribute 'label'

 <?xml version="1.0" encoding="UTF-8"?>
<!-- Generated with glade 3.18.3 -->
<interface>
  <requires lib="gtk+" version="3.0"/>
  <object class="GtkWindow" id="main_window">
    <property name="can_focus">False</property>
    <property name="window_position">center-always</property>
    <child>
      <object class="GtkBox" id="box1">
        <property name="visible">True</property>
        <property name="can_focus">False</property>
        <property name="orientation">vertical</property>
        <child>
          <object class="GtkLabel" id="label1">
            <property name="visible">True</property>
            <property name="can_focus">False</property>
          </object>
          <packing>
            <property name="expand">True</property>
            <property name="fill">False</property>
            <property name="padding">83</property>
            <property name="position">0</property>
          </packing>
        </child>
        <child>
          <object class="GtkButton" id="button1">
            <property name="label" translatable="yes">button</property>
            <property name="visible">True</property>
            <property name="can_focus">True</property>
            <property name="receives_default">True</property>
            <property name="halign">center</property>
            <property name="valign">center</property>
            <property name="margin_left">50</property>
            <property name="margin_right">50</property>
            <property name="margin_bottom">10</property>
            <signal name="pressed" handler="onButtonPressed" swapped="no"/>
          </object>
          <packing>
            <property name="expand">False</property>
            <property name="fill">True</property>
            <property name="position">1</property>
          </packing>
        </child>
        <child>
          <placeholder/>
        </child>
      </object>
    </child>
  </object>
</interface>

 TypeError: joke() takes exactly 2 arguments (1 given)

  def joke(self, widget=None):

 gobject.timeout_add(3000, indicator.joke, None)