How to use the anndata.read_loom function in anndata

elif ext in {'mtx', 'mtx.gz'}:
        adata = read_mtx(filename)
    elif ext == 'csv':
        adata = read_csv(filename, first_column_names=first_column_names)
    elif ext in {'txt', 'tab', 'data', 'tsv'}:
        if ext == 'data':
            logg.hint(
                "... assuming '.data' means tab or white-space "
                'separated text file',
            )
            logg.hint('change this by passing `ext` to sc.read')
        adata = read_text(filename, delimiter, first_column_names)
    elif ext == 'soft.gz':
        adata = _read_softgz(filename)
    elif ext == 'loom':
        adata = read_loom(filename=filename, **kwargs)
    else:
        raise ValueError(f'Unknown extension {ext}.')
    if cache:
        logg.info(
            f'... writing an {settings.file_format_data} '
            'cache file to speedup reading next time'
        )
        if cache_compression is _empty:
            cache_compression = settings.cache_compression
        if not path_cache.parent.is_dir():
            path_cache.parent.mkdir(parents=True)
        # write for faster reading when calling the next time
        adata.write(path_cache, compression=cache_compression)
    return adata