code: def iter_statuses(self, sha, number=-1, etag=None):
          
          url = ''
          if sha:
              url = self._build_url('statuses', sha, base_url=self._api)
          return self._iter(int(number), url, Status, etag=etag)
docs: Iterates over the statuses for a specific SHA.
  
          :param str sha: SHA of the commit to list the statuses of
          :param int number: (optional), return up to number statuses. Default:
              -1 returns all available statuses.
          :param str etag: (optional), ETag from a previous request to the same
              endpoint
          :returns: generator of :class:`Status <github3.repos.status.Status>`