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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 _reset_seq(self):
 """Updates attributes for gene represented in the self.bed attribute. Sequences are always upper case. """

        exon_seq_list, five_ss_seq_list, three_ss_seq_list = self._fetch_seq()
        self.exon_seq = ''.join(exon_seq_list)
        self.three_prime_seq = three_ss_seq_list
        self.five_prime_seq =  five_ss_seq_list
        self._to_upper()