def revert(self):
        """
        Revert any changes made to settings.
        """
        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()
Revert any changes made to settings.