code: def load(cls, path):
          
          assert os.path.exists(path), "No such file: %r" % path
  
          (folder, filename) = os.path.split(path)
          (name, extension) = os.path.splitext(filename)
  
          wave = Waveform(None)
          wave._path = path
          return wave
docs: Load Waveform from file.