code: def release(self, release_id):
          
          if release_id not in self.release_ids:
              return None
          return [Release(release_id, r) for r in self._releases[release_id]]
docs: A list of :class:`yarg.release.Release` objects for each file in a
          release.
  
          :param release_id: A pypi release id.
  
              >>> package = yarg.get('yarg')
              >>> last_release = yarg.releases[-1]
              >>> package.release(last_release)
              [<Release 0.1.0>, <Release 0.1.0>]