App Indicator demo. Create icon in systemtray. Work with both GTK and KDE

appindicator.py

#!/usr/bin/python3

import signal
import gi

gi.require_version('Gtk', '3.0')
gi.require_version('AppIndicator3', '0.1')

from gi.repository import Gtk
from gi.repository import AppIndicator3 as AppIndicator

def main():
    signal.signal(signal.SIGINT, signal.SIG_DFL)

    item = Gtk.MenuItem('Quit')
    item.connect('activate', Gtk.main_quit)

    menu = Gtk.Menu()
    menu.append(item)
    menu.show_all()

    APPINDICATOR_ID = 'DemoApp'
    ICON = 'dialog-information'  # Get default icon from /usr/share/icons/gnome/16x16/

    indicator = AppIndicator.Indicator.new(
        APPINDICATOR_ID, ICON, AppIndicator.IndicatorCategory.APPLICATION_STATUS)
    indicator.set_status(AppIndicator.IndicatorStatus.ACTIVE)
    indicator.set_menu(menu)

    Gtk.main()

if __name__ == '__main__':
    main()