code: def fleet_id_to_slug(did):
      
  
      try:
          fleet_slug = IOTileFleetSlug(did)
      except ValueError:
          raise ArgumentError("Unable to recognize {} as a fleet id".format(did))
  
      return str(fleet_slug)
docs: Converts a fleet id into a correct fleet slug.
  
      Args:
          did (long) : A fleet id
          did (string) : A device slug in the form of XXXX, XXXX-XXXX-XXXX, g--XXXX, g--XXXX-XXXX-XXXX
      Returns:
          str: The device slug in the g--XXXX-XXXX-XXX format
      Raises:
          ArgumentError: if the ID is not in the [1, 16**12] range, or if not a valid string