From 541627947af6597ca0890daf3a102704dbed1940 2014-10-16 16:45:12
From: Jonathan Frederic <jdfreder@calpoly.edu>
Date: 2014-10-16 16:45:12
Subject: [PATCH] Merge pull request #6666 from jdfreder/widget_numbers

Add version trait to Widget base,
---

diff --git a/IPython/html/widgets/widget.py b/IPython/html/widgets/widget.py
index d81be3e..62448d2 100644
--- a/IPython/html/widgets/widget.py
+++ b/IPython/html/widgets/widget.py
@@ -107,6 +107,7 @@ class Widget(LoggingConfigurable):
     msg_throttle = Int(3, sync=True, help="""Maximum number of msgs the 
         front-end can send before receiving an idle msg from the back-end.""")
     
+    version = Int(0, sync=True, help="""Widget's version""")
     keys = List()
     def _keys_default(self):
         return [name for name in self.traits(sync=True)]