How to use the pyuvdata.fhd.FHD 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

"""
        from . import fhd
        if isinstance(filelist[0], (list, tuple)):
            self.read_fhd(filelist[0], use_model=use_model, run_check=run_check,
                          check_extra=check_extra,
                          run_check_acceptability=run_check_acceptability)
            if len(filelist) > 1:
                for f in filelist[1:]:
                    uv2 = UVData()
                    uv2.read_fhd(f, use_model=use_model, run_check=run_check,
                                 check_extra=check_extra,
                                 run_check_acceptability=run_check_acceptability)
                    self += uv2
                del(uv2)
        else:
            fhd_obj = fhd.FHD()
            fhd_obj.read_fhd(filelist, use_model=use_model, run_check=run_check,
                             check_extra=check_extra,
                             run_check_acceptability=run_check_acceptability)
            self._convert_from_filetype(fhd_obj)
            del(fhd_obj)