--- a/controls/LibraryPanel.py	Fri Oct 12 11:50:40 2018 +0300
+++ b/controls/LibraryPanel.py	Fri Oct 12 12:06:45 2018 +0300
@@ -23,6 +23,7 @@
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
 from __future__ import absolute_import
+from functools import reduce
 import wx
 
 # -------------------------------------------------------------------------------