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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 get_tx_for_region(self, alt_ac, alt_aln_method, start_i, end_i):
 """ return transcripts that overlap given region :param str alt_ac: reference sequence (e.g., NC_000007.13) :param str alt_aln_method: alignment method (e.g., splign) :param int start_i: 5' bound of region :param int end_i: 3' bound of region """

        return self._fetchall(self._queries['tx_for_region'],
                              [alt_ac, alt_aln_method, start_i, end_i])