@NotNull
  public static List<PyExpression> getSuperClassExpressions(@NotNull PyClass pyClass) {
    final PyClassStub classStub = pyClass.getStub();
    if (classStub == null) {
      return List.of(pyClass.getSuperClassExpressions());
    }
    return ContainerUtil.mapNotNull(classStub.getSuperClassesText(), 
                                    x -> PyUtil.createExpressionFromFragment(x, pyClass.getContainingFile()));
  }
@NotNull
  public static List<PyExpression> getSuperClassExpressions(@NotNull PyClass pyClass)