docs: def _build_package_finder(options, index_urls, session):
          """
          Create a package finder appropriate to this list command.
          """
          return PackageFinder(
              find_links=options.get('find_links'),
              index_urls=index_urls,
              allow_all_prereleases=options.get('pre'),
              trusted_hosts=options.get('trusted_hosts'),
              session=session,
          )