ronantakizawa/codereview-bench huggingface dataset:
Repository: yt-dlp/yt-dlp
File: yt_dlp/extractor/beatbump.py (Python)

Code before:
import re

from yt_dlp.utils import ExtractorError
from .common import InfoExtractor


class BeatBumpIE(InfoExtractor):
    _VALID_URL = r'https:\/\/beatbump\.ml\/(?:(?:listen\?id=)|(?:playlist\/)|(?:artist\/)|(?:release\?id=))(?P<id>.*)'
    _TESTS = [{
        # Single video
        'url': 'https://beatbump.ml/listen?id=BciS5krYL80',
        'md5': '7f6c65ee0955228bcbb81066080fb46c',
        'info_dict': {
            'id': 'BciS5krYL80',
            'ext': 'mp4',
            'title': 'Hotel California (2013 Remaster)',
            'thumbnail': 'https://i.ytimg.com/vi_webp/BciS5krYL80/maxresdefault.webp',
            'artist': 'Eagles',
            'track': 'Hotel California (2013 Remaster)',
            'channel_follower_count': int,
            'channel_url': 'https://www.youtube.com/channel/UC49r4GNHHpc-eQ9hmD2Rg6A',
            'uploader': 'The Eagles - Topic',
            'alt_title': 'Hotel California (2013 Remaster)',
            'categories': ['Music'],
            'like_count': int,
            'view_count': int,
            'uploader_id': 'UC49r4GNHHpc-eQ9hmD2Rg6A',
            'tags': ['Eagles', 'Legacy', 'Hotel California'],

Review comment (refactor):
```suggestion
from ..utils import ExtractorError
```

Code after:
from .common import InfoExtractor
from .youtube import YoutubeIE, YoutubeTabIE


class BeatBumpVideoIE(InfoExtractor):
    _VALID_URL = r'https://beatbump\.ml/listen\?id=(?P<id>[\w-]+)'
    _TESTS = [{
        'url': 'https://beatbump.ml/listen?id=MgNrAu2pzNs',
        'md5': '5ff3fff41d3935b9810a9731e485fe66',
        'info_dict': {
            'id': 'MgNrAu2pzNs',
            'ext': 'mp4',
            'uploader_url': 'http://www.youtube.com/channel/UC-pWHpBjdGG69N9mM2auIAA',
            'artist': 'Stephen',
            'thumbnail': 'https://i.ytimg.com/vi_webp/MgNrAu2pzNs/maxresdefault.webp',
            'channel_url': 'https://www.youtube.com/channel/UC-pWHpBjdGG69N9mM2auIAA',
            'upload_date': '20190312',
            'categories': ['Music'],
            'playable_in_embed': True,
            'duration': 169,
            'like_count': int,
            'alt_title': 'Voyeur Girl',
            'view_count': int,
            'track': 'Voyeur Girl',
            'uploader': 'Stephen - Topic',
            'title': 'Voyeur Girl',
            'channel_follower_count': int,
            'uploader_id': 'UC-pWHpBjdGG69N9mM2auIAA',
Repository: yt-dlp/yt-dlp
File: yt_dlp/extractor/qingting.py (Python)

Code before:
# coding: utf-8
from __future__ import unicode_literals

from .common import InfoExtractor

from yt_dlp import utils


class QingTingIE(InfoExtractor):
    IE_NAME = 'QingTing'
    _VALID_URL = r'''(?x)
                     (?:https?://)?(?:www\.)?
                         (?P<m>m\.)?(?:qingting\.fm|qtfm\.cn)/(?(m)v|)
                         channels/\d+/programs/(?P<id>\d+)'''
    _TEST = {
        'url': 'https://www.qingting.fm/channels/378005/programs/22257411/',
        'md5': '47e6a94f4e621ed832c316fd1888fb3c',
        'info_dict': {
            'id': '22257411',
            'ext': 'mp3',
            'title': '用了十年才修改，谁在乎教科书？-睡前消息-蜻蜓FM听头条',
        }
    }

    def _real_extract(self, url):
        video_id = self._match_id(url)
        webpage = self._download_webpage(url, video_id)
        title = self._html_search_regex(r'(?s)<title\b[^>]*>(.*)</title>', webpage, 'title',
                                        default=None) or self._og_search_title(webpage)

Review comment (refactor):
```suggestion
from .common import InfoExtractor
```
not needed

Code after:
from .common import InfoExtractor

from ..utils import traverse_obj


class QingTingIE(InfoExtractor):
    _VALID_URL = r'https?://(?:www\.|m\.)?(?:qingting\.fm|qtfm\.cn)/v?channels/(?P<channel>\d+)/programs/(?P<id>\d+)'
    _TESTS = [{
        'url': 'https://www.qingting.fm/channels/378005/programs/22257411/',
        'md5': '47e6a94f4e621ed832c316fd1888fb3c',
        'info_dict': {
            'id': '22257411',
            'title': '用了十年才修改，谁在乎教科书？',
            'channel_id': '378005',
            'channel': '睡前消息',
            'uploader': '马督工',
            'ext': 'm4a',
        }
    }, {
        'url': 'https://m.qtfm.cn/vchannels/378005/programs/23023573/',
        'md5': '2703120b6abe63b5fa90b975a58f4c0e',
        'info_dict': {
            'id': '23023573',
            'title': '【睡前消息488】重庆山火之后，有图≠真相',
            'channel_id': '378005',
            'channel': '睡前消息',
            'uploader': '马督工',
            'ext': 'm4a',
        }
Repository: yt-dlp/yt-dlp
File: yt_dlp/extractor/qingting.py (Python)

Code before:
# coding: utf-8
from __future__ import unicode_literals

from .common import InfoExtractor

from yt_dlp import utils


class QingTingIE(InfoExtractor):
    IE_NAME = 'QingTing'
    _VALID_URL = r'''(?x)
                     (?:https?://)?(?:www\.)?
                         (?P<m>m\.)?(?:qingting\.fm|qtfm\.cn)/(?(m)v|)
                         channels/\d+/programs/(?P<id>\d+)'''
    _TEST = {
        'url': 'https://www.qingting.fm/channels/378005/programs/22257411/',
        'md5': '47e6a94f4e621ed832c316fd1888fb3c',
        'info_dict': {
            'id': '22257411',
            'ext': 'mp3',
            'title': '用了十年才修改，谁在乎教科书？-睡前消息-蜻蜓FM听头条',
        }
    }

    def _real_extract(self, url):
        video_id = self._match_id(url)
        webpage = self._download_webpage(url, video_id)
        title = self._html_search_regex(r'(?s)<title\b[^>]*>(.*)</title>', webpage, 'title',
                                        default=None) or self._og_search_title(webpage)
        urlType = self._search_regex(
            self._VALID_URL,

Review comment (refactor):
```suggestion
from ..utils import traverse_obj
```
`utils` should be a relative import, and import only what is needed from it.

if changes suggested below are applied, `traverse_obj` will be needed, and `url_or_none` and `ExtractorError` will be unnecessary

Code after:
from .common import InfoExtractor

from ..utils import traverse_obj


class QingTingIE(InfoExtractor):
    _VALID_URL = r'https?://(?:www\.|m\.)?(?:qingting\.fm|qtfm\.cn)/v?channels/(?P<channel>\d+)/programs/(?P<id>\d+)'
    _TESTS = [{
        'url': 'https://www.qingting.fm/channels/378005/programs/22257411/',
        'md5': '47e6a94f4e621ed832c316fd1888fb3c',
        'info_dict': {
            'id': '22257411',
            'title': '用了十年才修改，谁在乎教科书？',
            'channel_id': '378005',
            'channel': '睡前消息',
            'uploader': '马督工',
            'ext': 'm4a',
        }
    }, {
        'url': 'https://m.qtfm.cn/vchannels/378005/programs/23023573/',
        'md5': '2703120b6abe63b5fa90b975a58f4c0e',
        'info_dict': {
            'id': '23023573',
            'title': '【睡前消息488】重庆山火之后，有图≠真相',
            'channel_id': '378005',
            'channel': '睡前消息',
            'uploader': '马督工',
            'ext': 'm4a',
        }
    }]
Repository: yt-dlp/yt-dlp
File: yt_dlp/extractor/qingting.py (Python)

Code before:
# coding: utf-8
from __future__ import unicode_literals

from .common import InfoExtractor

from yt_dlp import utils


class QingTingIE(InfoExtractor):
    IE_NAME = 'QingTing'
    _VALID_URL = r'''(?x)
                     (?:https?://)?(?:www\.)?
                         (?P<m>m\.)?(?:qingting\.fm|qtfm\.cn)/(?(m)v|)
                         channels/\d+/programs/(?P<id>\d+)'''
    _TEST = {
        'url': 'https://www.qingting.fm/channels/378005/programs/22257411/',
        'md5': '47e6a94f4e621ed832c316fd1888fb3c',
        'info_dict': {
            'id': '22257411',
            'ext': 'mp3',
            'title': '用了十年才修改，谁在乎教科书？-睡前消息-蜻蜓FM听头条',
        }
    }

    def _real_extract(self, url):
        video_id = self._match_id(url)
        webpage = self._download_webpage(url, video_id)
        title = self._html_search_regex(r'(?s)<title\b[^>]*>(.*)</title>', webpage, 'title',
                                        default=None) or self._og_search_title(webpage)
        urlType = self._search_regex(
            self._VALID_URL,
            url, 'audio URL', group="m")
        if urlType == 'm.':
            url = self._search_regex(
                r'''("|')audioUrl\1\s*:\s*("|')(?P<url>(?:(?!\2).)*)\2''',

Review comment (suggestion):
```suggestion
```
not needed. the initial value of `IE_NAME` is the class name minus the last 2 characters

Code after:
from .common import InfoExtractor

from ..utils import traverse_obj


class QingTingIE(InfoExtractor):
    _VALID_URL = r'https?://(?:www\.|m\.)?(?:qingting\.fm|qtfm\.cn)/v?channels/(?P<channel>\d+)/programs/(?P<id>\d+)'
    _TESTS = [{
        'url': 'https://www.qingting.fm/channels/378005/programs/22257411/',
        'md5': '47e6a94f4e621ed832c316fd1888fb3c',
        'info_dict': {
            'id': '22257411',
            'title': '用了十年才修改，谁在乎教科书？',
            'channel_id': '378005',
            'channel': '睡前消息',
            'uploader': '马督工',
            'ext': 'm4a',
        }
    }, {
        'url': 'https://m.qtfm.cn/vchannels/378005/programs/23023573/',
        'md5': '2703120b6abe63b5fa90b975a58f4c0e',
        'info_dict': {
            'id': '23023573',
            'title': '【睡前消息488】重庆山火之后，有图≠真相',
            'channel_id': '378005',
            'channel': '睡前消息',
            'uploader': '马督工',
            'ext': 'm4a',
        }
    }]

    def _real_extract(self, url):
        channel_id, pid = self._match_valid_url(url).group('channel', 'id')
        webpage = self._download_webpage(
            f'https://m.qtfm.cn/vchannels/{channel_id}/programs/{pid}/', pid)
Repository: yt-dlp/yt-dlp
File: yt_dlp/extractor/qingting.py (Python)

Code before:
# coding: utf-8
from __future__ import unicode_literals

from .common import InfoExtractor

from yt_dlp import utils


class QingTingIE(InfoExtractor):
    IE_NAME = 'QingTing'
    _VALID_URL = r'''(?x)
                     (?:https?://)?(?:www\.)?
                         (?P<m>m\.)?(?:qingting\.fm|qtfm\.cn)/(?(m)v|)
                         channels/\d+/programs/(?P<id>\d+)'''
    _TEST = {
        'url': 'https://www.qingting.fm/channels/378005/programs/22257411/',
        'md5': '47e6a94f4e621ed832c316fd1888fb3c',
        'info_dict': {
            'id': '22257411',
            'ext': 'mp3',
            'title': '用了十年才修改，谁在乎教科书？-睡前消息-蜻蜓FM听头条',
        }
    }

    def _real_extract(self, url):
        video_id = self._match_id(url)
        webpage = self._download_webpage(url, video_id)
        title = self._html_search_regex(r'(?s)<title\b[^>]*>(.*)</title>', webpage, 'title',
                                        default=None) or self._og_search_title(webpage)
        urlType = self._search_regex(
            self._VALID_URL,
            url, 'audio URL', group="m")
        if urlType == 'm.':
            url = self._search_regex(
                r'''("|')audioUrl\1\s*:\s*("|')(?P<url>(?:(?!\2).)*)\2''',
                webpage, 'audio URL', group="url")
            test_url = utils.url_or_none(url)
            if not test_url:
                raise utils.ExtractorError('Invalid audio URL %s' % (url,))

Review comment (refactor):
```suggestion
    _VALID_URL = r'https?://(?:www\.|m\.)?(?:qingting\.fm|qtfm\.cn)/v?channels/(?P<channel>\d+)/programs/(?P<id>\d+)'
```

simplify, and capture both numeric ID values for a change suggested below

Code after:
from .common import InfoExtractor

from ..utils import traverse_obj


class QingTingIE(InfoExtractor):
    _VALID_URL = r'https?://(?:www\.|m\.)?(?:qingting\.fm|qtfm\.cn)/v?channels/(?P<channel>\d+)/programs/(?P<id>\d+)'
    _TESTS = [{
        'url': 'https://www.qingting.fm/channels/378005/programs/22257411/',
        'md5': '47e6a94f4e621ed832c316fd1888fb3c',
        'info_dict': {
            'id': '22257411',
            'title': '用了十年才修改，谁在乎教科书？',
            'channel_id': '378005',
            'channel': '睡前消息',
            'uploader': '马督工',
            'ext': 'm4a',
        }
    }, {
        'url': 'https://m.qtfm.cn/vchannels/378005/programs/23023573/',
        'md5': '2703120b6abe63b5fa90b975a58f4c0e',
        'info_dict': {
            'id': '23023573',
            'title': '【睡前消息488】重庆山火之后，有图≠真相',
            'channel_id': '378005',
            'channel': '睡前消息',
            'uploader': '马督工',
            'ext': 'm4a',
        }
    }]

    def _real_extract(self, url):
        channel_id, pid = self._match_valid_url(url).group('channel', 'id')
        webpage = self._download_webpage(
            f'https://m.qtfm.cn/vchannels/{channel_id}/programs/{pid}/', pid)
        info = self._search_json(r'window\.__initStores\s*=', webpage, 'program info', pid)
        return {
            'id': pid,
            'title': traverse_obj(info, ('ProgramStore', 'programInfo', 'title')),
Repository: yt-dlp/yt-dlp
File: yt_dlp/extractor/qingting.py (Python)

Code before:
from .common import InfoExtractor

from ..utils import traverse_obj


class QingTingIE(InfoExtractor):
    _VALID_URL = r'https?://(?:www\.|m\.)?(?:qingting\.fm|qtfm\.cn)/v?channels/(?P<channel>\d+)/programs/(?P<id>\d+)'
    _TESTS = {
        'url': 'https://www.qingting.fm/channels/378005/programs/22257411/',
        'md5': '47e6a94f4e621ed832c316fd1888fb3c',
        'info_dict': {
            'id': '22257411',
            'ext': 'mp3',
            'title': '用了十年才修改，谁在乎教科书？-睡前消息-蜻蜓FM听头条',
        }
    }

    def _real_extract(self, url):
        channel_id, pid = self._match_valid_url(url).groups()
        webpage = self._download_webpage(
            f'https://m.qtfm.cn/vchannels/{channel_id}/programs/{pid}/', pid)
        info = self._search_json(r'window\.__initStores\s*=', webpage, 'program info', pid)
        return {
            'id': pid,
            'title': traverse_obj(info, ('ProgramStore', 'programInfo', 'title')),
            'channel_id': channel_id,
            'url': traverse_obj(info, ('ProgramStore', 'programInfo', 'audioUrl')),
            'ext': 'm4a',
        }


Review comment (suggestion):
```suggestion
    _TESTS = [{
        'url': 'https://www.qingting.fm/channels/378005/programs/22257411/',
        'md5': '47e6a94f4e621ed832c316fd1888fb3c',
        'info_dict': {
            'id': '22257411',
            'ext': 'mp3',
            'title': '用了十年才修改，谁在乎教科书？-睡前消息-蜻蜓FM听头条',
        }
    }]
```

Code after:
from .common import InfoExtractor

from ..utils import traverse_obj


class QingTingIE(InfoExtractor):
    _VALID_URL = r'https?://(?:www\.|m\.)?(?:qingting\.fm|qtfm\.cn)/v?channels/(?P<channel>\d+)/programs/(?P<id>\d+)'
    _TESTS = [{
        'url': 'https://www.qingting.fm/channels/378005/programs/22257411/',
        'md5': '47e6a94f4e621ed832c316fd1888fb3c',
        'info_dict': {
            'id': '22257411',
            'title': '用了十年才修改，谁在乎教科书？',
            'channel_id': '378005',
            'channel': '睡前消息',
            'uploader': '马督工',
            'ext': 'm4a',
        }
    }, {
        'url': 'https://m.qtfm.cn/vchannels/378005/programs/23023573/',
        'md5': '2703120b6abe63b5fa90b975a58f4c0e',
        'info_dict': {
            'id': '23023573',
            'title': '【睡前消息488】重庆山火之后，有图≠真相',
            'channel_id': '378005',
            'channel': '睡前消息',
            'uploader': '马督工',
            'ext': 'm4a',
        }
    }]

    def _real_extract(self, url):
        channel_id, pid = self._match_valid_url(url).group('channel', 'id')
        webpage = self._download_webpage(
            f'https://m.qtfm.cn/vchannels/{channel_id}/programs/{pid}/', pid)
        info = self._search_json(r'window\.__initStores\s*=', webpage, 'program info', pid)
        return {
            'id': pid,
            'title': traverse_obj(info, ('ProgramStore', 'programInfo', 'title')),
            'channel_id': channel_id,
            'channel': traverse_obj(info, ('ProgramStore', 'channelInfo', 'title')),
Repository: yt-dlp/yt-dlp
File: yt_dlp/extractor/qingting.py (Python)

Code before:
from .common import InfoExtractor

from ..utils import traverse_obj


class QingTingIE(InfoExtractor):
    _VALID_URL = r'https?://(?:www\.|m\.)?(?:qingting\.fm|qtfm\.cn)/v?channels/(?P<channel>\d+)/programs/(?P<id>\d+)'
    _TESTS = [{
        'url': 'https://www.qingting.fm/channels/378005/programs/22257411/',
        'md5': '47e6a94f4e621ed832c316fd1888fb3c',
        'info_dict': {
            'id': '22257411',
            'ext': 'mp3',
            'title': '用了十年才修改，谁在乎教科书？-睡前消息-蜻蜓FM听头条',
        }
    }]

    def _real_extract(self, url):
        channel_id, pid = self._match_valid_url(url).groups()
        webpage = self._download_webpage(
            f'https://m.qtfm.cn/vchannels/{channel_id}/programs/{pid}/', pid)
        info = self._search_json(r'window\.__initStores\s*=', webpage, 'program info', pid)
        return {
            'id': pid,
            'title': traverse_obj(info, ('ProgramStore', 'programInfo', 'title')),
            'channel_id': channel_id,
            'url': traverse_obj(info, ('ProgramStore', 'programInfo', 'audioUrl')),
            'ext': 'm4a',
        }


Review comment (suggestion):
```suggestion
            'vcodec': 'none',
            'acodec': 'm4a',
            'ext': 'm4a',
```

Code after:
        'md5': '2703120b6abe63b5fa90b975a58f4c0e',
        'info_dict': {
            'id': '23023573',
            'title': '【睡前消息488】重庆山火之后，有图≠真相',
            'channel_id': '378005',
            'channel': '睡前消息',
            'uploader': '马督工',
            'ext': 'm4a',
        }
    }]

    def _real_extract(self, url):
        channel_id, pid = self._match_valid_url(url).group('channel', 'id')
        webpage = self._download_webpage(
            f'https://m.qtfm.cn/vchannels/{channel_id}/programs/{pid}/', pid)
        info = self._search_json(r'window\.__initStores\s*=', webpage, 'program info', pid)
        return {
            'id': pid,
            'title': traverse_obj(info, ('ProgramStore', 'programInfo', 'title')),
            'channel_id': channel_id,
            'channel': traverse_obj(info, ('ProgramStore', 'channelInfo', 'title')),
            'uploader': traverse_obj(info, ('ProgramStore', 'podcasterInfo', 'podcaster', 'nickname')),
            'url': traverse_obj(info, ('ProgramStore', 'programInfo', 'audioUrl')),
            'vcodec': 'none',
            'acodec': 'm4a',
            'ext': 'm4a',
        }
Repository: yt-dlp/yt-dlp
File: yt_dlp/extractor/qingting.py (Python)

Code before:
            'ext': 'm4a',
        }
    }, {
        'url': 'https://m.qtfm.cn/vchannels/378005/programs/23023573/',
        'md5': '2703120b6abe63b5fa90b975a58f4c0e',
        'info_dict': {
            'id': '23023573',
            'title': '【睡前消息488】重庆山火之后，有图≠真相',
            'channel_id': '378005',
            'channel_name': '睡前消息',
            'podcaster': '马督工',
            'ext': 'm4a',
        }
    }]

    def _real_extract(self, url):
        channel_id, pid = self._match_valid_url(url).group('channel', 'id')
        webpage = self._download_webpage(
            f'https://m.qtfm.cn/vchannels/{channel_id}/programs/{pid}/', pid)
        info = self._search_json(r'window\.__initStores\s*=', webpage, 'program info', pid)
        return {
            'id': pid,
            'title': traverse_obj(info, ('ProgramStore', 'programInfo', 'title')),
            'channel_id': channel_id,
            'channel_name': traverse_obj(info, ('ProgramStore', 'channelInfo', 'title')),
            'podcaster': traverse_obj(info, ('ProgramStore', 'podcasterInfo', 'podcaster', 'nickname')),
            'url': traverse_obj(info, ('ProgramStore', 'programInfo', 'audioUrl')),
            'vcodec': 'none',
            'acodec': 'm4a',
            'ext': 'm4a',
        }


Review comment (suggestion):
```suggestion
            'channel': traverse_obj(info, ('ProgramStore', 'channelInfo', 'title')),
            'uploader': traverse_obj(info, ('ProgramStore', 'podcasterInfo', 'podcaster', 'nickname')),
```

Code after:
            'ext': 'm4a',
        }
    }, {
        'url': 'https://m.qtfm.cn/vchannels/378005/programs/23023573/',
        'md5': '2703120b6abe63b5fa90b975a58f4c0e',
        'info_dict': {
            'id': '23023573',
            'title': '【睡前消息488】重庆山火之后，有图≠真相',
            'channel_id': '378005',
            'channel': '睡前消息',
            'uploader': '马督工',
            'ext': 'm4a',
        }
    }]

    def _real_extract(self, url):
        channel_id, pid = self._match_valid_url(url).group('channel', 'id')
        webpage = self._download_webpage(
            f'https://m.qtfm.cn/vchannels/{channel_id}/programs/{pid}/', pid)
        info = self._search_json(r'window\.__initStores\s*=', webpage, 'program info', pid)
        return {
            'id': pid,
            'title': traverse_obj(info, ('ProgramStore', 'programInfo', 'title')),
            'channel_id': channel_id,
            'channel': traverse_obj(info, ('ProgramStore', 'channelInfo', 'title')),
            'uploader': traverse_obj(info, ('ProgramStore', 'podcasterInfo', 'podcaster', 'nickname')),
            'url': traverse_obj(info, ('ProgramStore', 'programInfo', 'audioUrl')),
            'vcodec': 'none',
            'acodec': 'm4a',
            'ext': 'm4a',
        }
Repository: yt-dlp/yt-dlp
File: yt_dlp/extractor/tvp.py (Python)

Code before:
    }, {
        'url': 'https://vod.tvp.pl/dla-dzieci,24/laboratorium-alchemika-odcinki,309338',
        'only_matching': True,
    }]

    def _entries(self, seasons, playlist_id):
        for season in seasons:
            episodes = self._api_request(
                f'vods/serials/{playlist_id}/seasons/{season["id"]}/episodes', playlist_id,
                note=f'Downloading episode list for {season["title"]}')
            yield from (self._parse_video(episode) for episode in episodes)

    def _real_extract(self, url):
        playlist_id = self._match_id(url)
        metadata = self._api_request(
            f'vods/serials/{playlist_id}', playlist_id,
            note='Downloading serial metadata')
        seasons = self._api_request(
            f'vods/serials/{playlist_id}/seasons', playlist_id,
            note='Downloading season list')
        return {
            '_type': 'playlist',
            'title': metadata['title'],
            'description': clean_html(traverse_obj(metadata, ('description', 'lead'))),
            'entries': self._entries(seasons, playlist_id),
        }


Review comment (refactor):
`title` is not mandatory in a playlist, but there should be an ID. Also, could use `playlist_result()` method; consider extracting `metadata['mainCategory']['name']` as a category.
```suggestion
        return self.playlist_result(
            self._entries(seasons, playlist_id),
            playlist_id, metadata.get('title'),
            clean_html(traverse_obj(metadata, ('description', 'lead'))))
```

Code after:
            'title': 'Ranczo',
            'age_limit': 12,
            'categories': ['seriale'],
        },
        'playlist_count': 129,
    }, {
        'url': 'https://vod.tvp.pl/programy,88/rolnik-szuka-zony-odcinki,284514',
        'only_matching': True,
    }, {
        'url': 'https://vod.tvp.pl/dla-dzieci,24/laboratorium-alchemika-odcinki,309338',
        'only_matching': True,
    }]

    def _entries(self, seasons, playlist_id):
        for season in seasons:
            episodes = self._call_api(
                f'vods/serials/{playlist_id}/seasons/{season["id"]}/episodes', playlist_id,
                note=f'Downloading episode list for {season["title"]}')
            yield from map(self._parse_video, episodes)

    def _real_extract(self, url):
        playlist_id = self._match_id(url)
        metadata = self._call_api(
            f'vods/serials/{playlist_id}', playlist_id,
            note='Downloading serial metadata')
        seasons = self._call_api(
            f'vods/serials/{playlist_id}/seasons', playlist_id,
            note='Downloading season list')
        return self.playlist_result(
            self._entries(seasons, playlist_id), playlist_id, strip_or_none(metadata.get('title')),
            clean_html(traverse_obj(metadata, ('description', 'lead'), expected_type=strip_or_none)),
            categories=[traverse_obj(metadata, ('mainCategory', 'name'))],
            age_limit=int_or_none(metadata.get('rating')),
        )