code: def expire(app, sandbox, exit=True):
      
      success = []
      failures = []
      service = _mturk_service_from_config(sandbox)
      hits = _current_hits(service, app)
      for hit in hits:
          hit_id = hit["id"]
          try:
              service.expire_hit(hit_id)
              success.append(hit_id)
          except MTurkServiceException:
              failures.append(hit_id)
      out = Output()
      if success:
          out.log("Expired {} hits: {}".format(len(success), ", ".join(success)))
      if failures:
          out.log(
              "Could not expire {} hits: {}".format(len(failures), ", ".join(failures))
          )
      if not success and not failures:
          out.log("No hits found for this application.")
          if not sandbox:
              out.log(
                  "If this experiment was run in the MTurk sandbox, use: "
                  "`dallinger expire --sandbox --app {}`".format(app)
              )
      if exit and not success:
          sys.exit(1)
docs: Expire hits for an experiment id.