How to use the specutils.SpectrumList.read function in specutils

def _try_priority_file_loaders(self, file_path):
        fmts = self._get_matching_formats(file_path)
        logging.warning("Loaders for '%s' matched for this data set. "
                        "Iterating based on priority."
                        "", ', '.join(fmts))

        for fmt in fmts:
            try:
                speclist = SpectrumList.read(file_path, format=fmt)
                return speclist
            except IORegistryError:
                logging.warning("Attempted load with '%s' failed, "
                                "trying next loader.", fmt)

        raise IOError('Could not find appropriate loader for given file')

Format specified for the astropy io interface.

        Returns
        -------
        : :class:`~specutils.SpectrumList`
            A `~specutils.SpectrumList` instance containing the spectra loaded from the file
        """
        # In the case that the user has selected auto load, loop through every
        # available loader and choose the one that 1) the registry identifier
        # function allows, and 2) is the highest priority.
        try:
            if file_loader:
                if file_loader not in self._get_matching_formats(file_path):
                    msg = 'Given file can not be processed as specified file format ({})'
                    raise IOError(msg.format(file_loader))
            speclist = SpectrumList.read(file_path, format=file_loader)
        except IORegistryError as e:
            # In this case, assume that the registry has found several
            # loaders that fit the same identifier, choose the highest
            # priority one.
            speclist = self._try_priority_file_loaders(file_path)

        return speclist