@Override
    protected String suggestNameForElement(PsiNamedElement element, NameSuggester suggester, String newClassName, String oldClassName) {
      if (element instanceof PyFile && element.getName().equals(StringUtil.toLowerCase(oldClassName) + ".py")) {
        return StringUtil.toLowerCase(newClassName) + ".py";
      }
      return super.suggestNameForElement(element, suggester, newClassName, oldClassName);
    }
@Override
    protected String suggestNameForElement(PsiNamedElement element, NameSuggester suggester, String newClassName, String oldClassName)