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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 percentage(self):
 """ Returns the percentage of votes cast for this poll option in relation to all of its poll's other options. """

        total_vote_count = self.poll.vote_count
        if total_vote_count:
            return self.vote_count * 100.0 / total_vote_count
        return 0