ciclo for x gtk.button

list=list_modules()
for i in list:
    button=gtk.Button()
    hb.add(button)
    hb.set_child_packing(button,0,0,0,gtk.PACK_START)
    button.set_size_request(200,200)
    button_image=gtk.Image()
    button_image.set_from_file("modules/"+i+"/"+i+".png")
    button.set_image(button_image)
    button.connect("clicked",lambda *w: play("modules/"+i+"/"+i+".wav"))