import audio, e32snd_lock = e32.Ao_lock()def sound_callback(prev_state, current_state, err):     if current_state == audio.EOpen:             snd_lock.signal()def playMP3():     mp3 = audio.Sound.open("E:\\Sounds\\mysound.mp3")     mp3.play(callback = sound_callback)     snd_lock.wait()     mp3.close()     print "PlayMP3 returns.."playMP3()