public static List<PyTargetExpression> getSuperClassAttributes(@NotNull PyClass cls) {
    List<PyTargetExpression> attrs = new ArrayList<>();
    List<String> seenNames = new ArrayList<>();
    for (PyTargetExpression expr : cls.getClassAttributes()) {
      seenNames.add(expr.getName());
    }
    for (PyClass ancestor : cls.getAncestorClasses(null)) {
      for (PyTargetExpression expr : ancestor.getClassAttributes()) {
        if (!seenNames.contains(expr.getName())) {
          seenNames.add(expr.getName());
          attrs.add(expr);
        }
      }
    }
    return attrs;
  }
public static List<PyTargetExpression> getSuperClassAttributes(@NotNull PyClass cls)