Repository: yt-dlp/yt-dlp
File: yt_dlp/extractor/rule34video.py (Python)

Code before:
                'upload_date': '20211222',
                'uploader': 'CerZule',
                'uploader_url': 'https://rule34video.com/members/36281/',
                'categories': ['3D', 'Tomb Raider'],
                'tags': 'mincount:40'
            }
        },
    ]

    def _real_extract(self, url):
        video_id = self._match_id(url)
        webpage = self._download_webpage(url, video_id)

        formats = []

        for mobj in re.finditer(r'<a[^>]+href="(?P<video_url>[^"]+download=true[^"]+)".*>(?P<ext>[^\s]+) (?P<quality>[^<]+)p</a>', webpage):
            url, ext, quality = mobj.groups()
            formats.append({
                'url': url,
                'ext': ext.lower(),
                'quality': quality,
            })

        categories = None
        creator = None
        uploader, uploader_url = None, None
        for col in get_elements_by_class('col', webpage):
            label = clean_html(get_element_by_class('label', col))
            if label == 'Categories:':
                categories = list(map(clean_html, get_elements_by_class('item', col)))
            elif label == 'Artist:':
                creator = join_nonempty(*map(clean_html, get_elements_by_class('item', col)), delim=', ')
            elif label == 'Uploaded By:':
                uploader = clean_html(get_element_by_class('name', col))
                uploader_url = extract_attributes(get_element_html_by_class('name', col) or '').get('href')

        json_ld = self._search_json_ld(webpage, video_id, default={})

        return {
            **traverse_obj(json_ld, ({
                'title': 'title',
                'view_count': 'view_count',
                'like_count': 'like_count',
                'duration': 'duration',
                'timestamp': 'timestamp',
                'description': 'description',
                'thumbnail': ('thumbnails', 0, 'url'),
            })),
            'id': video_id,
            'formats': formats,
            'title': self._html_extract_title(webpage),

Review comment (suggestion):
```suggestion
        categories, creator, uploader, uploader_url = [None] * 4
```

Code after:
                'uploader': 'CerZule',
                'uploader_url': 'https://rule34video.com/members/36281/',
                'categories': ['3D', 'Tomb Raider'],
                'tags': 'mincount:40'
            }
        },
    ]

    def _real_extract(self, url):
        video_id = self._match_id(url)
        webpage = self._download_webpage(url, video_id)

        formats = []

        for mobj in re.finditer(r'<a[^>]+href="(?P<video_url>[^"]+download=true[^"]+)".*>(?P<ext>[^\s]+) (?P<quality>[^<]+)p</a>', webpage):
            url, ext, quality = mobj.groups()
            formats.append({
                'url': url,
                'ext': ext.lower(),
                'quality': quality,
            })

        categories, creator, uploader, uploader_url = [None] * 4
        for col in get_elements_by_class('col', webpage):
            label = clean_html(get_element_by_class('label', col))
            if label == 'Categories:':
                categories = list(map(clean_html, get_elements_by_class('item', col)))
            elif label == 'Artist:':
                creator = join_nonempty(*map(clean_html, get_elements_by_class('item', col)), delim=', ')
            elif label == 'Uploaded By:':
                uploader = clean_html(get_element_by_class('name', col))
                uploader_url = extract_attributes(get_element_html_by_class('name', col) or '').get('href')

        return {
            **traverse_obj(self._search_json_ld(webpage, video_id, default={}), ({
                'title': 'title',
                'view_count': 'view_count',
                'like_count': 'like_count',
                'duration': 'duration',
                'timestamp': 'timestamp',
                'description': 'description',
                'thumbnail': ('thumbnails', 0, 'url'),
            })),
            'id': video_id,
            'formats': formats,
            'title': self._html_extract_title(webpage),
            'thumbnail': self._html_search_regex(
                r'preview_url:\s+\'([^\']+)\'', webpage, 'thumbnail', default=None),
            'duration': parse_duration(self._html_search_regex(
                r'"icon-clock"></i>\s+<span>((?:\d+:?)+)', webpage, 'duration', default=None)),
            'view_count': int_or_none(self._html_search_regex(