@Override
      public void applyFix(@NotNull Project project, @NotNull PsiElement element, @NotNull ModPsiUpdater updater) {
        final PyClass cls = PyUtil.as(element.getParent(), PyClass.class);
        if (cls == null) return;

        final PyClass abcClass = PyPsiFacade.getInstance(project).createClassByQName(PyNames.ABC, cls);
        if (abcClass == null) return;

        PyPsiRefactoringUtil.addSuperclasses(project, cls, abcClass);
      }
@Override
      public void applyFix(@NotNull Project project, @NotNull PsiElement element, @NotNull ModPsiUpdater updater)