code: def find_video_detail_by_id(self, video_id, ext=None):
          
          url = 'https://api.youku.com/videos/show.json'
          params = {
              'client_id': self.client_id,
              'video_id': video_id
          }
          if ext:
              params['ext'] = ext
          r = requests.get(url, params=params)
          check_error(r)
          return r.json()
docs: doc: http://cloud.youku.com/docs?id=46