import dbus

SLUZBA   = "org.freedesktop.DBus"
OBJEKT   = "/org/freedesktop/DBus"
ROZHRANI = "org.freedesktop.DBus"

bus   = dbus.SessionBus()
proxy = bus.get_object(SLUZBA, OBJEKT)

for name in proxy.ListNames(dbus_interface = ROZHRANI):
    print name