new_contents: """
  Create wav files from recorded audio stored by ros_record.py
  
  Usage: npz_to_wav.py NPZ_FILE
  """
  
  import sys
  import numpy as np
  import scipy.io.wavfile
  
  RATE = 44100
  
  data = np.load(sys.argv[1])
  audio = data['audio']
  
  for i  in range(audio.shape[0]):
      scipy.io.wavfile.write('fizz{0:0>4}.wav'.format(i), RATE, audio[i,...])
  
subject: add script to generate wav files