code: def revert(self):
          
          for attr, value in self._changed.items():
              setattr(django_settings, attr, value)
          for attr in self._added:
              delattr(django_settings, attr)
          self._changed = {}
          self._added = []
          if self.isolated:
              self._isolated_overrides = BaseSettings()
docs: Revert any changes made to settings.