Repository: yt-dlp/yt-dlp
File: yt_dlp/extractor/bilibili.py (Python)

Code before:
        playlist_id = f'{mid}_{sid}'

        def fetch_page(page_idx):
            return self._download_json(
                'https://api.bilibili.com/x/polymer/space/seasons_archives_list',
                playlist_id, note=f'Downloading page {page_idx}',
                query={'mid': mid, 'season_id': sid, 'page_num': page_idx + 1, 'page_size': 30})['data']

        def get_metadata(page_data):
            page_size = page_data['page']['page_size']
            entry_count = page_data['page']['total']
            return {
                'page_count': math.ceil(entry_count / page_size),
                'page_size': page_size,
                'uploader': self._get_uploader(mid, playlist_id),
                **traverse_obj(page_data, {
                    'title': ('meta', 'name', {str_or_none}),
                    'description': ('meta', 'description', {str_or_none}),
                    'uploader_id': ('meta', 'mid', {str_or_none}),
                    'timestamp': ('meta', 'ptime', {int_or_none}),
                    'thumbnail': ('meta', 'cover', {url_or_none}),
                })
            }

        def get_entries(page_data):
            return self._get_entries(page_data, ('archives', ..., 'bvid', {str}))

        metadata, paged_list = self._extract_playlist(fetch_page, get_metadata, get_entries)
        return self.playlist_result(paged_list, playlist_id, **metadata)


class BilibiliSeriesListIE(BilibiliSpaceListBaseIE):
    _VALID_URL = r'https?://space.bilibili\.com/(?P<mid>\d+)/channel/seriesdetail/?\?\bsid=(?P<sid>\d+)'
    _TESTS = [{
        'url': 'https://space.bilibili.com/1958703906/channel/seriesdetail?sid=547718&ctype=0',
        'info_dict': {
            'id': '1958703906_547718',
            'title': '直播回放',
            'description': '直播回放',
            'uploader': '靡烟miya',
            'uploader_id': '1958703906',
            'timestamp': 1637985853,
            'upload_date': '20211127',
            'modified_timestamp': int,
            'modified_date': str,
        },
        'playlist_mincount': 513,
    }]

    def _real_extract(self, url):
        mid, sid = self._match_valid_url(url).group('mid', 'sid')

Review comment (suggestion):
To go along with the suggestion for `BilibiliSpaceListBaseIE._get_entries()`:
```suggestion
        def get_entries(page_data):
            return self._get_entries(page_data, 'archives')
```

Code after:
                'page_count': page_data['pageCount'],
                'page_size': page_data['pageSize'],
            }

        def get_entries(page_data):
            for entry in page_data.get('data', []):
                yield self.url_result(f'https://www.bilibili.com/audio/au{entry["id"]}', BilibiliAudioIE, entry['id'])

        metadata, paged_list = self._extract_playlist(fetch_page, get_metadata, get_entries)
        return self.playlist_result(paged_list, playlist_id)


class BilibiliSpaceListBaseIE(BilibiliSpaceBaseIE):
    def _get_entries(self, page_data, bvid_keys, ending_key='bvid'):
        for bvid in traverse_obj(page_data, (*variadic(bvid_keys, (str, bytes, dict, set)), ..., ending_key, {str})):
            yield self.url_result(f'https://www.bilibili.com/video/{bvid}', BiliBiliIE, bvid)

    def _get_uploader(self, uid, playlist_id):
        webpage = self._download_webpage(f'https://space.bilibili.com/{uid}', playlist_id, fatal=False)
        return self._search_regex(r'(?s)<title\b[^>]*>([^<]+)的个人空间-', webpage, 'uploader', fatal=False)

    def _extract_playlist(self, fetch_page, get_metadata, get_entries):
        metadata, page_list = super()._extract_playlist(fetch_page, get_metadata, get_entries)
        metadata.pop('page_count', None)
        metadata.pop('page_size', None)
        return metadata, page_list


class BilibiliCollectionListIE(BilibiliSpaceListBaseIE):
    _VALID_URL = r'https?://space\.bilibili\.com/(?P<mid>\d+)/channel/collectiondetail/?\?sid=(?P<sid>\d+)'
    _TESTS = [{
        'url': 'https://space.bilibili.com/2142762/channel/collectiondetail?sid=57445',
        'info_dict': {
            'id': '2142762_57445',
            'title': '【完结】《底特律 变人》全结局流程解说',
            'description': '',
            'uploader': '老戴在此',
            'uploader_id': '2142762',
            'timestamp': int,
            'upload_date': str,
            'thumbnail': 'https://archive.biliimg.com/bfs/archive/e0e543ae35ad3df863ea7dea526bc32e70f4c091.jpg',
        },
        'playlist_mincount': 31,
    }]

    def _real_extract(self, url):
        mid, sid = self._match_valid_url(url).group('mid', 'sid')
        playlist_id = f'{mid}_{sid}'

        def fetch_page(page_idx):
            return self._download_json(