code: def create_status(self, state, target_url=github.GithubObject.NotSet, description=github.GithubObject.NotSet, context=github.GithubObject.NotSet):
          
          assert isinstance(state, (str, unicode)), state
          assert target_url is github.GithubObject.NotSet or isinstance(target_url, (str, unicode)), target_url
          assert description is github.GithubObject.NotSet or isinstance(description, (str, unicode)), description
          assert context is github.GithubObject.NotSet or isinstance(context, (str, unicode)), context
          post_parameters = {
              "state": state,
          }
          if target_url is not github.GithubObject.NotSet:
              post_parameters["target_url"] = target_url
          if description is not github.GithubObject.NotSet:
              post_parameters["description"] = description
          if context is not github.GithubObject.NotSet:
              post_parameters["context"] = context
          headers, data = self._requester.requestJsonAndCheck(
              "POST",
              self._parentUrl(self._parentUrl(self.url)) + "/statuses/" + self.sha,
              input=post_parameters
          )
          return github.CommitStatus.CommitStatus(self._requester, headers, data, completed=True)
docs: :calls: `POST /repos/:owner/:repo/statuses/:sha <http://developer.github.com/v3/repos/statuses>`_
          :param state: string
          :param target_url: string
          :param description: string
          :param context: string
          :rtype: :class:`github.CommitStatus.CommitStatus`