code: def available_files(self):
          
          matches = []
          for pattern in self.filename_patterns:
              logger.debug("Matching filename pattern: %s", pattern)
              matches.extend(natsort(glob.glob(parse_path(pattern))))
          return matches
docs: The filenames of the available configuration files (a list of strings).
  
          The value of :attr:`available_files` is computed the first time its
          needed by searching for available configuration files that match
          :attr:`filename_patterns` using :func:`~glob.glob()`. If you set
          :attr:`available_files` this effectively disables searching for
          configuration files.