diff -r 27b0dbaf0ea8 Lib/tkinter/__init__.py
--- a/Lib/tkinter/__init__.py	Sun Jun 12 00:39:41 2016 +0300
+++ b/Lib/tkinter/__init__.py	Sun Jun 12 01:50:14 2016 +0300
@@ -229,6 +229,19 @@ class Event:
             del state['send_event']
         if self.state == 0:
             del state['state']
+        elif isinstance(self.state, int):
+            flags = state['state']
+            mods = ('Shift', 'Lock', 'Control',
+                    'Alt', 'Mod2', 'Mod3', 'Mod4', 'Mod5',
+                    'Button1', 'Button2', 'Button3', 'Button4', 'Button5')
+            s = []
+            for i, n in enumerate(mods):
+                if flags & (1 << i):
+                    s.append(n)
+            flags = flags & ~((1<< len(mods)) - 1)
+            if flags or not s:
+                s.append(str(flags))
+            state['state'] = '|'.join(s)
         if self.delta == 0:
             del state['delta']
         # widget usually is known