code: def ToDebugString(self):
      
      text_parts = ['Path segment index\tPath segments(s)']
      for index, path_segments in self.path_segments_per_index.items():
        text_parts.append('{0:d}\t\t\t[{1:s}]'.format(
            index, ', '.join(path_segments)))
  
      text_parts.append('')
  
      return '\n'.join(text_parts)
docs: Converts the path filter table into a debug string.