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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 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()