protected boolean isValidIntroduceContext(PsiElement element) {
    final PyDecorator decorator = PsiTreeUtil.getParentOfType(element, PyDecorator.class);
    if (decorator != null && PsiTreeUtil.isAncestor(decorator.getCallee(), element, false)) {
      return false;
    }
    return PsiTreeUtil.getParentOfType(element, PyParameterList.class) == null;
  }
protected boolean isValidIntroduceContext(PsiElement element)