code: def release(self, shortname):
          
          url = 'api/v6/releases/?shortname=%s' % shortname
          releases = yield self._get(url)
          # Note, even if this shortname does not exist, _get() will not errback
          # for this url. It simply returns an empty list. So check that here:
          if not releases:
              raise ReleaseNotFoundException('no release %s' % shortname)
          release = Release.fromDict(releases[0])
          release.connection = self
          defer.returnValue(release)
docs: Get a specific release by its shortname.
  
          :param shortname: str, eg. "ceph-3-0"
          :returns: deferred that when fired returns a Release (Munch, dict-like)
                    object representing this release.
          :raises: ReleaseNotFoundException if this release does not exist.