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

Code before:
            },
            {
                'url': 'https://nekohacker.com/wp-content/uploads/2022/11/04-Crystal-World.mp3',
                'md5': 'd8e59a48061764e50d92386a294abd50',
                'info_dict': {
                    'id': '04-Crystal-World',
                    'ext': 'mp3',
                    'title': 'Crystal World',
                    'thumbnail': 'https://nekohacker.com/wp-content/uploads/2022/11/Nekoverse_Artwork-1024x1024.jpg',
                    'vcodec': 'none',
                    'acodec': 'mp3',
                    'upload_date': '20221101'
                }
            }
        ]
    }]

    def _real_extract(self, url):
        playlist_id = self._match_id(url)

        webpage = self._download_webpage(url, playlist_id)

        webpage = get_element_by_class('playlist', webpage)

        if webpage is None:
            raise ExtractorError('no playlist element found - likely not a album', expected=True)

        # the h3 is acutally empty when downloaded by youtube-dl
        # playlist_title = get_element_by_class('sr_it-playlist-title', webpage)
        playlist_title = None

        entries = []

        for track in re.findall(
                r'(<li[^>][^>]+>)',
                webpage):
            attr = extract_attributes(track)
            tracktitle = attr['data-tracktitle']
            trackurl = attr['data-audiopath']

            if playlist_title is None:
                playlist_title = attr['data-albumtitle']

            id = self._search_regex(self._ENTRY_URL, trackurl, 'trackurl id')

            # full_response = self._request_webpage(trackurl, id, headers={
            #     'Accept-Encoding': 'identity',
            # })
            # content_type = full_response.headers.get('Content-Type', '').lower()

            upload_date = datetime.strptime(attr['data-releasedate'], '%Y.%m.%d Release')

Review comment (refactor):
For readability, just use a new variable instead of redefining `webpage` since then the name is no longer accurate
```suggestion
        playlist_id = self._match_id(url)
        webpage = self._download_webpage(url, playlist_id)
        playlist = get_element_by_class('playlist', webpage)
        if playlist is None:
            raise ExtractorError('No playlist element found; this URL is likely not for an album', expected=True)
```

Code after:
                    'artist': 'Neko Hacker',
                    'track': 'City Runner',
                    'track_number': 2,
                    'duration': 148.0
                }
            },
            {
                'url': 'https://nekohacker.com/wp-content/uploads/2022/11/03-Nature-Talk.mp3',
                'md5': '5a8a8ae852720cee4c0ac95c7d1a7450',
                'info_dict': {
                    'id': '1714',
                    'ext': 'mp3',
                    'title': 'Nature Talk',
                    'thumbnail': 'https://nekohacker.com/wp-content/uploads/2022/11/Nekoverse_Artwork-1024x1024.jpg',
                    'vcodec': 'none',
                    'acodec': 'mp3',
                    'release_date': '20221101',
                    'album': 'Nekoverse',
                    'artist': 'Neko Hacker',
                    'track': 'Nature Talk',
                    'track_number': 3,
                    'duration': 174.0
                }
            },
            {
                'url': 'https://nekohacker.com/wp-content/uploads/2022/11/04-Crystal-World.mp3',
                'md5': 'd8e59a48061764e50d92386a294abd50',
                'info_dict': {
                    'id': '1715',
                    'ext': 'mp3',
                    'title': 'Crystal World',
                    'thumbnail': 'https://nekohacker.com/wp-content/uploads/2022/11/Nekoverse_Artwork-1024x1024.jpg',
                    'vcodec': 'none',
                    'acodec': 'mp3',
                    'release_date': '20221101',
                    'album': 'Nekoverse',
                    'artist': 'Neko Hacker',
                    'track': 'Crystal World',
                    'track_number': 4,
                    'duration': 199.0
                }
            }
        ]
    }, {
        'url': 'https://nekohacker.com/susume/',
        'info_dict': {
            'id': 'susume',
            'title': '進め！むじなカンパニー',
        },
        'playlist': [
            {