code: def release_downloads(request, package_name, version):
      
      session = DBSession()
      release_files = ReleaseFile.by_release(session, package_name, version)
      if release_files:
          release_files = [(f.release.package.name,
                              f.filename) for f in release_files]
      return release_files
docs: Retrieve a list of files and download count for a given package and
      release version.