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

Code before:
        'info_dict': {
            'id': 'VOD00041610',
            'ext': 'mp4',
            'title': '花千骨第1集',
            'thumbnail': r're:https?://.*\.jpg$',
            'description': '《花千骨》陸劇線上看。十六年前，平靜的村莊內，一名女嬰隨異相出生，途徑此地的蜀山掌門清虛道長算出此女命運非同一般，她體內散發的異香易招惹妖魔。一念慈悲下，他在村莊周邊設下結界阻擋妖魔入侵，讓其年滿十六後去蜀山，並賜名花千骨。',
            'categories': ['奇幻', '愛情', '中國', '仙俠'],
            'episode': 'Episode 1',
            'episode_number': 1,
        },
        'params': {
            'noplaylist': True,
        },
        'skip': 'Georestricted to Taiwan',
    }]

    def _extract_playlist(self, seasons_list, content_type):
        episode_title = seasons_list['title']
        content_id = seasons_list['contentId']

        all_episodes = [
            self.url_result(smuggle_url(
                self._URL_TEMPLATE % (content_type, episode['contentId']),
                {'force_noplaylist': True}))  # To prevent infinite recursion
            for season in seasons_list['seasons']
            for episode in season['episode']]

        return self.playlist_result(all_episodes, content_id, episode_title)

    def _real_extract(self, url):
        url, smuggled_data = unsmuggle_url(url, {})

        video_id = self._match_id(url)

        webpage = self._download_webpage(url, video_id)

        if '<meta http-equiv="refresh" content="1;url=https://www.litv.tv/"' in webpage:
            raise ExtractorError('No such content', expected=True)

        program_info = self._parse_json(self._search_regex(
            r'var\s+programInfo\s*=\s*([^;]+)', webpage, 'VOD data', default='{}'),
            video_id)

        # In browsers `getProgramInfo` request is always issued. Usually this
        # endpoint gives the same result as the data embedded in the webpage.
        # If, for some reason, there are no embedded data, we do an extra request.
        if 'assetId' not in program_info:
            program_info = self._download_json(
                'https://www.litv.tv/vod/ajax/getProgramInfo', video_id,
                query={'contentId': video_id},
                headers={'Content-Type': 'application/json',

Review comment (suggestion):
We don't need 2 `for` loops:

```py
        all_episodes = [
            self.url_result(smuggle_url(
                self._URL_TEMPLATE % (content_type, episode['contentId']),
                {'force_noplaylist': True}))  # To prevent infinite recursion
            for episode in traverse_obj(playlist_data, ('seasons', ..., 'episode', lambda _, v: v['contentId']))]
```

Code after:
        'md5': 'b90ff1e9f1d8f5cfcd0a44c3e2b34c7a',
        'info_dict': {
            'id': 'VOD00041610',
            'ext': 'mp4',
            'title': '花千骨第1集',
            'thumbnail': r're:https?://.*\.jpg$',
            'description': '《花千骨》陸劇線上看。十六年前，平靜的村莊內，一名女嬰隨異相出生，途徑此地的蜀山掌門清虛道長算出此女命運非同一般，她體內散發的異香易招惹妖魔。一念慈悲下，他在村莊周邊設下結界阻擋妖魔入侵，讓其年滿十六後去蜀山，並賜名花千骨。',
            'categories': ['奇幻', '愛情', '中國', '仙俠'],
            'episode': 'Episode 1',
            'episode_number': 1,
        },
        'params': {
            'noplaylist': True,
        },
        'skip': 'Georestricted to Taiwan',
    }, {
        'url': 'https://www.litv.tv/promo/miyuezhuan/?content_id=VOD00044841&',
        'md5': '88322ea132f848d6e3e18b32a832b918',
        'info_dict': {
            'id': 'VOD00044841',
            'ext': 'mp4',
            'title': '芈月傳第1集　霸星芈月降世楚國',
            'description': '楚威王二年，太史令唐昧夜觀星象，發現霸星即將現世。王后得知霸星的預言後，想盡辦法不讓孩子順利出生，幸得莒姬相護化解危機。沒想到眾人期待下出生的霸星卻是位公主，楚威王對此失望至極。楚王后命人將女嬰丟棄河中，居然奇蹟似的被少司命像攔下，楚威王認為此女非同凡響，為她取名芈月。',
        },
        'skip': 'No longer exists',
    }]

    def _extract_playlist(self, playlist_data, content_type):
        all_episodes = [
            self.url_result(smuggle_url(
                self._URL_TEMPLATE % (content_type, episode['contentId']),
                {'force_noplaylist': True}))  # To prevent infinite recursion
            for episode in traverse_obj(playlist_data, ('seasons', ..., 'episode', lambda _, v: v['contentId']))]

        return self.playlist_result(all_episodes, playlist_data['contentId'], playlist_data.get('title'))

    def _real_extract(self, url):
        url, smuggled_data = unsmuggle_url(url, {})

        video_id = self._match_id(url)

        webpage = self._download_webpage(url, video_id)

        if self._search_regex(
                r'(?i)<meta\s[^>]*http-equiv="refresh"\s[^>]*content="[0-9]+;\s*url=https://www\.litv\.tv/"',
                webpage, 'meta refresh redirect', default=False, group=0):
            raise ExtractorError('No such content found', expected=True)

        program_info = self._parse_json(self._search_regex(
            r'var\s+programInfo\s*=\s*([^;]+)', webpage, 'VOD data', default='{}'),
            video_id)