code: def has_in_subscriptions(self, subscription):
          
          assert isinstance(subscription, github.Repository.Repository), subscription
          status, headers, data = self._requester.requestJson(
              "GET",
              "/user/subscriptions/" + subscription._identity
          )
          return status == 204
docs: :calls: `GET /user/subscriptions/:owner/:repo <http://developer.github.com/v3/activity/watching>`_
          :param subscription: :class:`github.Repository.Repository`
          :rtype: bool