From 16f80aed360acbc407f3dcdb3f8a8851afb49449 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Wed, 18 Nov 2015 11:26:07 +0530
Subject: [PATCH] ...

---
 src/calibre/db/categories.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/calibre/db/categories.py b/src/calibre/db/categories.py
index 2e463a07a1..49408959c8 100644
--- a/src/calibre/db/categories.py
+++ b/src/calibre/db/categories.py
@@ -34,7 +34,7 @@ class Tag(object):
         self.is_hierarchical = ''
         self.is_editable = is_editable
         self.is_searchable = is_searchable
-        self.id_set = id_set if id_set is not None else set([])
+        self.id_set = id_set if id_set is not None else set()
         self.avg_rating = avg/2.0 if avg is not None else 0
         self.sort = sort
         self.use_sort_as_name = use_sort_as_name