Exit script for the i3 window manager based off of exit script from CrunchBang Linux.

i3-exit

#!/usr/bin/env python

# based on cb-exit used in CrunchBang Linux <http://crunchbanglinux.org/>

import pygtk
pygtk.require('2.0')
import gtk
import os
import getpass

class i3_exit:
    def disable_buttons(self):
        self.cancel.set_sensitive(False)
        self.logout.set_sensitive(False)
        self.suspend.set_sensitive(False)
        self.reboot.set_sensitive(False)
        self.shutdown.set_sensitive(False)

    def cancel_action(self,btn):
        self.disable_buttons()
        gtk.main_quit()

    def logout_action(self,btn):
        self.disable_buttons()
        self.status.set_label("Exiting i3, please standby...")
        os.system("i3-msg exit")

    def suspend_action(self,btn):
        self.disable_buttons()
        self.status.set_label("Suspending, please standby...")
        os.system("i3-lock")
        os.system("dbus-send --system --print-reply \
                --dest=\"org.freedesktop.UPower\"   \
                /org/freedesktop/UPower             \
                org.freedesktop.UPower.Suspend")
        gtk.main_quit()

    def reboot_action(self,btn):
        self.disable_buttons()
        self.status.set_label("Rebooting, please standby...")
        os.system("dbus-send --system --print-reply   \
                --dest=\"org.freedesktop.ConsoleKit\" \
                /org/freedesktop/ConsoleKit/Manager   \
                org.freedesktop.ConsoleKit.Manager.Restart")

    def shutdown_action(self,btn):
        self.disable_buttons()
        self.status.set_label("Shutting down, please standby...")
        os.system("dbus-send --system --print-reply   \
                --dest=\"org.freedesktop.ConsoleKit\" \
                /org/freedesktop/ConsoleKit/Manager   \
                org.freedesktop.ConsoleKit.Manager.Stop")

    def create_window(self):
        self.window = gtk.Window()
        title = "Log out " + getpass.getuser() + "? Choose an option:"
        self.window.set_title(title)
        self.window.set_border_width(5)
        self.window.set_size_request(500, 80)
        self.window.set_resizable(False)
        self.window.set_keep_above(True)
        self.window.stick
        self.window.set_position(1)
        self.window.connect("delete_event", gtk.main_quit)
        windowicon = self.window.render_icon(gtk.STOCK_QUIT, gtk.ICON_SIZE_MENU)
        self.window.set_icon(windowicon)

        
        #Create HBox for buttons
        self.button_box = gtk.HBox()
        self.button_box.show()
        
        #Cancel button
        self.cancel = gtk.Button(stock = gtk.STOCK_CANCEL)
        self.cancel.set_border_width(4)
        self.cancel.connect("clicked", self.cancel_action)
        self.button_box.pack_start(self.cancel)
        self.cancel.show()
        
        #Logout button
        self.logout = gtk.Button("_Log out")
        self.logout.set_border_width(4)
        self.logout.connect("clicked", self.logout_action)
        self.button_box.pack_start(self.logout)
        self.logout.show()
        
        #Suspend button
        self.suspend = gtk.Button("_Suspend")
        self.suspend.set_border_width(4)
        self.suspend.connect("clicked", self.suspend_action)
        self.button_box.pack_start(self.suspend)
        self.suspend.show()
        
        #Reboot button
        self.reboot = gtk.Button("_Reboot")
        self.reboot.set_border_width(4)
        self.reboot.connect("clicked", self.reboot_action)
        self.button_box.pack_start(self.reboot)
        self.reboot.show()
        
        #Shutdown button
        self.shutdown = gtk.Button("_Power off")
        self.shutdown.set_border_width(4)
        self.shutdown.connect("clicked", self.shutdown_action)
        self.button_box.pack_start(self.shutdown)
        self.shutdown.show()
        
        #Create HBox for status label
        self.label_box = gtk.HBox()
        self.label_box.show()
        self.status = gtk.Label()
        self.status.show()
        self.label_box.pack_start(self.status)
        
        #Create VBox and pack the above HBox's
        self.vbox = gtk.VBox()
        self.vbox.pack_start(self.button_box)
        self.vbox.pack_start(self.label_box)
        self.vbox.show()
        
        self.window.add(self.vbox)
        self.window.show()
        
    def __init__(self):
        self.create_window()


def main():
    gtk.main()

if __name__ == "__main__":
    go = i3_exit()
    main()

No go here. It worked on my last system. Just reinstalled (debian net install with i3wm) and nothing happens after clicking reboot/shutdown.
Get this error - Error org.freedesktop.DBus.Error.ServiceUnknown: The name org.freedesktop.ConsoleKit was not provided by any .service files

As noted by Ruben G the service changed in Ubuntu 14.04. The following are current as of today:

dbus-send --system --print-reply --dest=org.freedesktop.login1 /org/freedesktop/login1 \
    "org.freedesktop.login1.Manager.Suspend" boolean:true

dbus-send --system --print-reply --dest=org.freedesktop.login1 /org/freedesktop/login1 \
    "org.freedesktop.login1.Manager.Reboot" boolean:true

dbus-send --system --print-reply --dest=org.freedesktop.login1 /org/freedesktop/login1 \
    "org.freedesktop.login1.Manager.PowerOff" boolean:true

@commonquail, do you have the updated source ? I try to change the value of (foo) to your (new foo boolean:true) , but I got eror "wrong syntax" .

but when executing your script directly in terminal, it works.

I am running this from a hotkey in terminal but it is not actually shutting down anything. Anyone else experiencing this problem?

If the above code doesn't solve your problem, would you try this: https://sourceforge.net/projects/logout-for-i3-window-manager/

Just installed it on Debian 10. Works great, thanks a lot!
How would I get the screen locked after "suspend"?