code: def get_pulls_review_comments(self, sort=github.GithubObject.NotSet, direction=github.GithubObject.NotSet, since=github.GithubObject.NotSet):
          
          assert sort is github.GithubObject.NotSet or isinstance(sort, (str, unicode)), sort
          assert direction is github.GithubObject.NotSet or isinstance(direction, (str, unicode)), direction
          assert since is github.GithubObject.NotSet or isinstance(since, datetime.datetime), since
          url_parameters = dict()
          if sort is not github.GithubObject.NotSet:
              url_parameters["sort"] = sort
          if direction is not github.GithubObject.NotSet:
              url_parameters["direction"] = direction
          if since is not github.GithubObject.NotSet:
              url_parameters["since"] = since.strftime("%Y-%m-%dT%H:%M:%SZ")
          return github.PaginatedList.PaginatedList(
              github.IssueComment.IssueComment,
              self._requester,
              self.url + "/pulls/comments",
              url_parameters
          )
docs: :calls: `GET /repos/:owner/:repo/pulls/comments <http://developer.github.com/v3/pulls/comments>`_
          :param sort: string
          :param direction: string
          :param since: datetime.datetime
          :rtype: :class:`github.PaginatedList.PaginatedList` of :class:`github.PullRequestComment.PullRequestComment`