@NotNull
  private static List<PyKeywordArgument> filterKeywordArguments(@NotNull List<PyExpression> arguments) {
    final List<PyKeywordArgument> results = new ArrayList<>();
    for (PyExpression argument : arguments) {
      if (argument instanceof PyKeywordArgument) {
        results.add((PyKeywordArgument)argument);
      }
    }
    return results;
  }
@NotNull
  private static List<PyKeywordArgument> filterKeywordArguments(@NotNull List<PyExpression> arguments)