@Nullable
  private static Set<String> loadStdlibPackagesList() {
    final Logger log = Logger.getInstance(PyStdlibUtil.class.getName());
    final String helperPath = PythonHelpersLocator.findPathInHelpers("/tools/stdlib_packages.txt");
    try (BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(helperPath), StandardCharsets.UTF_8))) {
      return reader.lines().collect(Collectors.toSet());
    }
    catch (IOException e) {
      log.error("Cannot read list of standard library packages: " + e.getMessage());
    }
    return null;
  }
@Nullable
  private static Set<String> loadStdlibPackagesList()