text: from __future__ import unicode_literals
  
  from .common import InfoExtractor
  from ..compat import (
      compat_str,
      compat_urllib_parse_urlencode,
  )
  from ..utils import (
      ExtractorError,
      format_field,
      int_or_none,
      qualities,
  )
  
  
  class FlickrIE(InfoExtractor):
      _VALID_URL = r'https?://(?:www\.|secure\.)?flickr\.com/photos/[\w\-_@]+/(?P<id>\d+)'
      _TEST = {
          'url': 'http://www.flickr.com/photos/forestwander-nature-pictures/5645318632/in/photostream/',
          'md5': '164fe3fa6c22e18d448d4d5af2330f31',
          'info_dict': {
              'id': '5645318632',
              'ext': 'mpg',
              'description': 'Waterfalls in the Springtime at Dark Hollow Waterfalls. These are located just off of Skyline Drive in Virginia. They are only about 6/10 of a mile hike but it is a pretty steep hill and a good climb back up.',
              'title': 'Dark Hollow Waterfalls',
              'duration': 19,
              'timestamp': 1303528740,
              'upload_date': '20110423',
              'uploader_id': '10922353@N03',
              'uploader': 'Forest Wander',
              'uploader_url': 'https://www.flickr.com/photos/forestwander-nature-pictures/',
              'comment_count': int,
              'view_count': int,
              'tags': list,
              'license': 'Attribution-ShareAlike',
          }
      }
      _API_BASE_URL = 'https://api.flickr.com/services/rest?'
      # https://help.yahoo.com/kb/flickr/SLN25525.html
      _LICENSES = {
          '0': 'All Rights Reserved',
          '1': 'Attribution-NonCommercial-ShareAlike',
          '2': 'Attribution-NonCommercial',
          '3': 'Attribution-NonCommercial-NoDerivs',
          '4': 'Attribution',
          '5': 'Attribution-ShareAlike',
          '6': 'Attribution-NoDerivs',
          '7': 'No known copyright restrictions',
          '8': 'United States government work',
          '9': 'Public Domain Dedication (CC0)',
          '10': 'Public Domain Work',
      }
  
      def _call_api(self, method, video_id, api_key, note, secret=None):
          query = {
              'photo_id': video_id,
              'method': 'flickr.%s' % method,
              'api_key': api_key,
              'format': 'json',
              'nojsoncallback': 1,
          }
          if secret:
              query['secret'] = secret
          data = self._download_json(self._API_BASE_URL + compat_urllib_parse_urlencode(query), video_id, note)
          if data['stat'] != 'ok':
              raise ExtractorError(data['message'])
          return data
  
      def _real_extract(self, url):
          video_id = self._match_id(url)
  
          api_key = self._download_json(
              'https://www.flickr.com/hermes_error_beacon.gne', video_id,
              'Downloading api key')['site_key']
  
          video_info = self._call_api(
              'photos.getInfo', video_id, api_key, 'Downloading video info')['photo']
          if video_info['media'] == 'video':
              streams = self._call_api(
                  'video.getStreamInfo', video_id, api_key,
                  'Downloading streams info', video_info['secret'])['streams']
  
              preference = qualities(
                  ['288p', 'iphone_wifi', '100', '300', '700', '360p', 'appletv', '720p', '1080p', 'orig'])
  
              formats = []
              for stream in streams['stream']:
                  stream_type = compat_str(stream.get('type'))
                  formats.append({
                      'format_id': stream_type,
                      'url': stream['_content'],
                      'quality': preference(stream_type),
                  })
              self._sort_formats(formats)
  
              owner = video_info.get('owner', {})
              uploader_id = owner.get('nsid')
              uploader_path = owner.get('path_alias') or uploader_id
              uploader_url = format_field(uploader_path, template='https://www.flickr.com/photos/%s/')
  
              return {
                  'id': video_id,
                  'title': video_info['title']['_content'],
                  'description': video_info.get('description', {}).get('_content'),
                  'formats': formats,
                  'timestamp': int_or_none(video_info.get('dateuploaded')),
                  'duration': int_or_none(video_info.get('video', {}).get('duration')),
                  'uploader_id': uploader_id,
                  'uploader': owner.get('realname'),
                  'uploader_url': uploader_url,
                  'comment_count': int_or_none(video_info.get('comments', {}).get('_content')),
                  'view_count': int_or_none(video_info.get('views')),
                  'tags': [tag.get('_content') for tag in video_info.get('tags', {}).get('tag', [])],
                  'license': self._LICENSES.get(video_info.get('license')),
              }
          else:
              raise ExtractorError('not a video', expected=True)
  