code: def iter_comments_on_commit(self, sha, number=1, etag=None):
          
          url = self._build_url('commits', sha, 'comments', base_url=self._api)
          return self._iter(int(number), url, RepoComment, etag=etag)
docs: Iterate over comments for a single commit.
  
          :param sha: (required), sha of the commit to list comments on
          :type sha: str
          :param int number: (optional), number of comments to return. Default:
              -1 returns all comments
          :param str etag: (optional), ETag from a previous request to the same
              endpoint
          :returns: generator of
              :class:`RepoComment <github3.repos.comment.RepoComment>`\ s