code: def create_subjects_file(filelist, labels, output_file, split=':'):
      
      if len(filelist) != len(labels):
          raise ValueError('Expected `filelist` and `labels` to have the same length.'
                           'Got {} and {}.'.format(len(filelist), len(labels)))
  
      lines = []
      for i, subj in enumerate(filelist):
          lab  = labels[i]
          line = subj + split + str(lab)
          lines.append(line)
  
      lines = np.array(lines)
      np.savetxt(output_file, lines, fmt='%s')
docs: Creates a file where each line is <subject_file>:<subject_class_label>.
  
      Parameters
      ----------
      filelist: list of str
      List of filepaths
  
      labels: list of int, str or labels that can be transformed with str()
      List of labels
  
      output_file: str
      Output file path
  
      split: str
      Split character for each line