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- class MusicFile(object):
- pass
- class MP3(MusicFile):
- pass
- class Midi(MusicFile):
- pass
- def file_processor(file_type):
- known_types = ['mp3': MP3, 'mid': Midi]
- if file_type in known_types: return known_types[file_type]()
- raise NotImplementedError()
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