code: def backend_from_mime(mime):
      
      try:
          mod_name = MIMETYPE_TO_BACKENDS[mime]
  
      except KeyError:
          msg = "No handler for %r, defaulting to %r" % (mime, DEFAULT_MIME)
          if 'FULLTEXT_TESTING' in os.environ:
              warn(msg)
          else:
              LOGGER.debug(msg)
  
          mod_name = MIMETYPE_TO_BACKENDS[DEFAULT_MIME]
      mod = import_mod(mod_name)
      return mod
docs: Determine backend module object from a mime string.