.. efun:: object next_inventory()
  object next_inventory(object ob)

  Get next object in the same inventory as ob. If ob is not given, the current object will be used.

  This efun is mostly used together with the efun :efun:`first_inventory`.

  .. seealso:: :efun:`first_inventory`, :efun:`all_inventory`, :efun:`environment`, :efun:`deep_inventory`