import dbus

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

bus    = dbus.SystemBus()
proxy  = sessBus.get_object(SLUZBA, OBJEKT)
slDBus = dbus.Interface(proxy, ROZHRANI)

for name in slDBus.ListNames():
    print name