code: def prepare_cache_id(self, combined_args_kw):
          "get the cacheid (conc. string of argument self.ids in order)"
          cache_id = "".join(self.id(a) for a in combined_args_kw)
          return cache_if prepare_cache_id(self, combined_args_kw):
          "get the cacheid (conc. string of argument self.ids in order)"
          cache_id = "".join(self.id(a) for a in combined_args_kw)
          return cache_id
docs: get the cacheid (conc. string of argument self.ids in order)