doc: http://open.youku.com/docs/doc?id=67

def find_playlists_by_ids(self, playlist_ids):
        """doc: http://open.youku.com/docs/doc?id=67
        """
        url = 'https://openapi.youku.com/v2/playlists/show_batch.json'
        params = {
            'client_id': self.client_id,
            'playlist_ids': playlist_ids
        }
        r = requests.get(url, params=params)
        check_error(r)
        return r.json()