doc: http://open.youku.com/docs/doc?id=64

def find_videos_by_show(self, show_id, show_videotype=None,
                            show_videostage=None, orderby='videoseq-asc',
                            page=1, count=20):
        """doc: http://open.youku.com/docs/doc?id=64
        """
        url = 'https://openapi.youku.com/v2/shows/videos.json'
        params = {
            'client_id': self.client_id,
            'show_id': show_id,
            'page': page,
            'count': count,
            'show_videotype': show_videotype,
            'show_videostage': show_videostage,
            'orderby': orderby
        }
        params = remove_none_value(params)
        r = requests.get(url, params=params)
        check_error(r)
        return r.json()