public static List<String> getStringValues(PyExpression[] elements) {
    List<String> results = new ArrayList<>();
    for (PyExpression element : elements) {
      if (element instanceof PyStringLiteralExpression) {
        results.add(((PyStringLiteralExpression)element).getStringValue());
      }
    }
    return results;
  }
public static List<String> getStringValues(PyExpression[] elements)