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

Code before:
            })),
        }


class ZaikoETicketIE(ZaikoBaseIE):
    _VALID_URL = r'https?://zaiko\.io/account/eticket/(?P<id>\w{48}=)'
    _TESTS = [{
        'url': 'https://zaiko.io/account/eticket/000000000000000000000000000000000000000000000000=',
        'only_matching': True,
    }]

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

        webpage, urlh = self._download_webpage_handle(url, ticket_id)
        final_url = urlh.geturl()
        if 'zaiko.io/login' in final_url:
            self.raise_login_required()
        eticket_meta = self._parse_vue_element_attr('eticket', webpage, ticket_id)

        ticket_details = eticket_meta.get('ticket-details')
        streams = eticket_meta.get('streams') or []

        return self.playlist_result(
            [self.url_result(stream.get('url'), ZaikoIE) for stream in streams], ticket_id,
            ticket_details.get('event_name'), thumbnail=ticket_details.get('event_img_url'))


Review comment (suggestion):
`traverse_obj` will prevent `url_result(None)` and can eliminate the need for the intermediate vars
```suggestion
        eticket = self._parse_vue_element_attr('eticket', webpage, ticket_id)

        return self.playlist_result(
            [self.url_result(stream, ZaikoIE) for stream in traverse_obj(eticket, ('streams', ..., 'url'))],
            ticket_id, **traverse_obj(eticket, ('ticket-details', {
                'title': 'event_name',
                'thumbnail': 'event_img_url',
            })))
```

Code after:
                'uploader_id': ('profile', 'id', {str_or_none}),
                'release_timestamp': ('stream', 'start', 'timestamp', {int_or_none}),
                'categories': ('event', 'genres', ..., {lambda x: x or None}),
            }),
            **traverse_obj(player_meta, ('initial_event_info', {
                'alt_title': ('title', {str}),
                'thumbnail': ('poster_url', {url_or_none}),
            })),
        }


class ZaikoETicketIE(ZaikoBaseIE):
    _VALID_URL = r'https?://(?:www.)?zaiko\.io/account/eticket/(?P<id>[\w=-]{49})'
    _TESTS = [{
        'url': 'https://zaiko.io/account/eticket/TZjMwMzQ2Y2EzMXwyMDIzMDYwNzEyMTMyNXw1MDViOWU2Mw==',
        'playlist_count': 1,
        'info_dict': {
            'id': 'f30346ca31-20230607121325-505b9e63',
            'title': 'ZAIKO STREAMING TEST',
            'thumbnail': 'https://media.zkocdn.net/pf_1/1_3wdyjcjyupseatkwid34u',
        },
        'skip': 'Only available with the ticketholding account',
    }]

    def _real_extract(self, url):
        ticket_id = self._match_id(url)
        ticket_id = try_call(
            lambda: base64.urlsafe_b64decode(ticket_id[1:]).decode().replace('|', '-')) or ticket_id

        webpage = self._download_real_webpage(url, ticket_id)
        eticket = self._parse_vue_element_attr('eticket', webpage, ticket_id)

        return self.playlist_result(
            [self.url_result(stream, ZaikoIE) for stream in traverse_obj(eticket, ('streams', ..., 'url'))],
            ticket_id, **traverse_obj(eticket, ('ticket-details', {
                'title': 'event_name',
                'thumbnail': 'event_img_url',
            })))