def sspro_results(self):
        """Parse the SSpro output file and return a dict of secondary structure compositions.

        Returns:
            dict: Keys are sequence IDs, values are the lists of secondary structure predictions.
                H: helix
                E: strand
                C: the rest

        """
        return ssbio.protein.sequence.utils.fasta.load_fasta_file_as_dict_of_seqs(self.out_sspro)