code: def cancel_subscribe(self, access_token, show_id):
          
          url = 'https://openapi.youku.com/v2/users/subscribe/cancel.json'
          params = {
              'client_id': self.client_id,
              'access_token': access_token,
              'show_id': show_id
          }
          r = requests.post(url, data=params)
          check_error(r)
          return r.json()['result'] == 0
docs: doc: ??