code: def get_unset_cache(self):
          
          caches = []
          if self._cached_api_global_response is None:
              caches.append('global')
          if self._cached_api_ticker_response is None:
              caches.append('ticker')
          return (len(caches), caches)
docs: return : returns a tuple (num_of_not_None_caches, [list of unset caches endpoint])