How to use the pypinyin.Style function in pypinyin

def test_finals_tone3_no_final():
    assert convert('ń', Style.FINALS_TONE3, True, None) == 'n2'

def _add_pinyin(txtlines, output_path):
    ''' txt2pinyin in one file '''
    logger = logging.getLogger('mtts')
    all_pinyin = []
    for line in txtlines:
        numstr, txt = line.split(' ')
        txt = re.sub('#\d', '', txt)
        pinyin_list = pinyin(txt, style=Style.TONE3)
        new_pinyin_list = []
        for item in pinyin_list:
            if not item:
                logger.warning(
                    '{file_num} do not generate right pinyin'.format(numstr))
            if not item[0][-1].isdigit():
                phone = item[0] + '5'
            else:
                #phone = item[0]
                phone = item[0].replace('v', 'u')
            new_pinyin_list.append(phone)
        all_pinyin.append(numstr + ' ' + ' '.join(new_pinyin_list))
    all_pinyin_file = os.path.join(output_path, 'all_pinyin.lab')
    with open(all_pinyin_file, 'w') as oid:
        for item in all_pinyin:
            oid.write(item + '\n')