How to use the pyuvdata.miriad.Miriad function in pyuvdata

def _convert_to_filetype(self, filetype):
        if filetype is 'uvfits':
            from . import uvfits
            other_obj = uvfits.UVFITS()
        elif filetype is 'fhd':
            from . import fhd
            other_obj = fhd.FHD()
        elif filetype is 'miriad':
            from . import miriad
            other_obj = miriad.Miriad()
        elif filetype is 'uvh5':
            from . import uvh5
            other_obj = uvh5.UVH5()
        else:
            raise ValueError('filetype must be uvfits, miriad, fhd, or uvh5')
        for p in self:
            param = getattr(self, p)
            setattr(other_obj, p, param)
        return other_obj

phase_type=phase_type, antenna_nums=antenna_nums,
                             ant_str=ant_str, bls=bls,
                             polarizations=polarizations, time_range=time_range)
            if len(filepath) > 1:
                for f in filepath[1:]:
                    uv2 = UVData()
                    uv2.read_miriad(f, correct_lat_lon=correct_lat_lon,
                                    run_check=run_check, check_extra=check_extra,
                                    run_check_acceptability=run_check_acceptability,
                                    phase_type=phase_type, antenna_nums=antenna_nums,
                                    ant_str=ant_str, bls=bls,
                                    polarizations=polarizations, time_range=time_range)
                    self += uv2
                del(uv2)
        else:
            miriad_obj = miriad.Miriad()
            miriad_obj.read_miriad(filepath, correct_lat_lon=correct_lat_lon,
                                   run_check=run_check, check_extra=check_extra,
                                   run_check_acceptability=run_check_acceptability,
                                   phase_type=phase_type, antenna_nums=antenna_nums,
                                   ant_str=ant_str, bls=bls,
                                   polarizations=polarizations, time_range=time_range)
            self._convert_from_filetype(miriad_obj)
            del(miriad_obj)