def _play(self):
audios = []
for wav in self._wfs:
audios.append(AudioSegment.from_file(wav))
if len(audios) == 1:
playback.play(audios[0])
elif len(audios) > 1:
wait = audios[0].overlay(audios[1])
for i in range(2,len(audios)):
wait = wait.overlay(audios[i])
playback.play(wait)
# example
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