code: def _get_editable(self, request):
          
          try:
              editable_settings = self._editable_caches[request]
          except KeyError:
              editable_settings = self._editable_caches[request] = self._load()
          return editable_settings
docs: Get the dictionary of editable settings for a given request. Settings
          are fetched from the database once per request and then stored in
          ``_editable_caches``, a WeakKeyDictionary that will automatically
          discard each entry when no more references to the request exist.