import dbus
from dbus.mainloop.glib import DBusGMainLoop
import gobject

DBusGMainLoop(set_as_default=True)
bus = dbus.SystemBus()

# Initialize a main loop
mainloop = gobject.MainLoop()
bus.add_signal_receiver(cb_udisk_dev_add, signal_name='DeviceAdded', dbus_interface="org.freedesktop.UDisks")
bus.add_signal_receiver(cb_udisk_dev_rem, signal_name='DeviceRemoved', dbus_interface="org.freedesktop.UDisks")

mainloop.run()