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