def _compute_mfcc_pure_python(self):
        """
        Compute MFCCs using the pure Python code.
        """
        self.log(u"Computing MFCCs using pure Python code...")
        try:
            self.__mfcc = MFCC(
                rconf=self.rconf,
                logger=self.logger
            ).compute_from_data(
                self.audio_file.audio_samples,
                self.audio_file.audio_sample_rate
            ).transpose()
            self.log(u"Computing MFCCs using pure Python code... done")
            return (True, None)
        except Exception as exc:
            self.log_exc(u"An unexpected error occurred while running pure Python code", exc, False, None)
        return (False, None)
Compute MFCCs using the pure Python code.