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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 rollback(self):
 """Revert the previous modification to the refpkg. """

        # This is slightly complicated because of Python's freakish
        # assignment semantics and because we don't store multiple
        # copies of the log.
        if self.contents['rollback'] is None:
            raise ValueError("No operation to roll back on refpkg")
        future_msg = self.contents['log'][0]
        rolledback_log = self.contents['log'][1:]
        rollforward = copy.deepcopy(self.contents)
        rollforward.pop('rollback')
        self.contents = self.contents['rollback']
        self.contents['log'] = rolledback_log
        self.contents['rollforward'] = [future_msg, rollforward]
        self._sync_to_disk()