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

Code before:
            if not next_url:
                break

    def _real_extract(self, url):
        collection_slug = self._match_id(url)
        channel = self._call_api(
            f'https://content.api.nebula.app/content/{collection_slug}/?include=lessons',
            collection_slug, note='Retrieving channel')

        if channel.get('type') == 'class':
            entries = self._generate_class_entries(channel)
        elif channel.get('type') == 'podcast_channel':
            entries = self._generate_podcast_entries(channel['id'], collection_slug)
        else:
            entries = self._generate_playlist_entries(channel['id'], collection_slug)

        return self.playlist_result(
            entries=entries,
            playlist_id=collection_slug,
            playlist_title=channel.get('title'),
            playlist_description=channel.get('description'))


class NebulaSeasonIE(NebulaBaseIE):
    IE_NAME = 'nebula:season'
    _VALID_URL = rf'{_BASE_URL_RE}/(?P<series>[\w-]+)/?season/(?P<season_number>\d+)'
    _TESTS = [{
        'url': 'https://nebula.tv/jetlag/season/15',
        'info_dict': {
            'id': 'jetlag_15',
        },
        'playlist_count': 8,
    }, {
        'url': 'https://nebula.tv/jetlag/season/14',
        'info_dict': {
            'id': 'jetlag_14',
        },
        'playlist_mincount': 8,
    }]

    def _entries(self, data):
        base_url = 'https://nebula.tv'
        for episode in traverse_obj(data, ('episodes')):
            episode_id = traverse_obj(episode, ('video', 'id'))
            metadata = self._extract_video_metadata(episode)
            yield self.url_result(smuggle_url(f'{base_url}/videos/{episode_id}', {'id': episode_id}),
                                  NebulaIE, episode_id, url_transparent=True, **metadata)
        for extra in traverse_obj(data, ('extras')):
            extra_id = traverse_obj(extra, ('items', ..., 'id'))[0]
            metadata = self._extract_video_metadata(traverse_obj(extra, ('items', 0)))
            yield self.url_result(smuggle_url(f'{base_url}/videos/{extra_id}', {'id': extra_id}),

Review comment (suggestion):
```suggestion
    _VALID_URL = rf'{_BASE_URL_RE}/(?P<series>[\w-]+)/season/(?P<season_number>\d+)'
```

Code after:
    def _real_extract(self, url):
        collection_slug = self._match_id(url)
        channel = self._call_api(
            f'https://content.api.nebula.app/content/{collection_slug}/?include=lessons',
            collection_slug, note='Retrieving channel')

        if channel.get('type') == 'class':
            entries = self._generate_class_entries(channel)
        elif channel.get('type') == 'podcast_channel':
            entries = self._generate_podcast_entries(channel['id'], collection_slug)
        else:
            entries = self._generate_playlist_entries(channel['id'], collection_slug)

        return self.playlist_result(
            entries=entries,
            playlist_id=collection_slug,
            playlist_title=channel.get('title'),
            playlist_description=channel.get('description'))


class NebulaSeasonIE(NebulaBaseIE):
    IE_NAME = 'nebula:season'
    _VALID_URL = rf'{_BASE_URL_RE}/(?P<series>[\w-]+)/season/(?P<season_number>\d+)'
    _TESTS = [{
        'url': 'https://nebula.tv/jetlag/season/15',
        'info_dict': {
            'id': 'jetlag_15',
            'title': 'Tag: All Stars',
            'description': 'md5:5aa5b8abf3de71756448dc44ffebb674',
        },
        'playlist_count': 8,
    }, {
        'url': 'https://nebula.tv/jetlag/season/14',
        'info_dict': {
            'id': 'jetlag_14',
            'title': 'Snake',
            'description': 'md5:6da9040f1c2ac559579738bfb6919d1e',
        },
        'playlist_count': 8,
    }]

    def _build_url_result(self, item):
        url = (
            traverse_obj(item, ('share_url', {url_or_none}))
            or urljoin('https://nebula.tv/', item.get('app_path'))
            or f'https://nebula.tv/videos/{item["slug"]}')
        return self.url_result(
            smuggle_url(url, {'id': item['id']}),
            NebulaIE, url_transparent=True,
            **self._extract_video_metadata(item))