code: def create_comment(self, body):
          
          json = None
          if body:
              url = self._build_url('comments', base_url=self._api)
              json = self._json(self._post(url, data={'body': body}),
                                201)
          return IssueComment(json, self) if json else None
docs: Create a comment on this issue.
  
          :param str body: (required), comment body
          :returns: :class:`IssueComment <github3.issues.comment.IssueComment>`