Backported from 4.9.3, Closes ##697348
Index: python-qt4-4.7.3/pyuic/uic/uiparser.py
===================================================================
--- python-qt4-4.7.3.orig/pyuic/uic/uiparser.py	2010-04-16 06:32:09.000000000 -0400
+++ python-qt4-4.7.3/pyuic/uic/uiparser.py	2013-08-31 16:13:08.538679027 -0400
@@ -181,7 +181,14 @@
         elif isinstance(widget, QtGui.QAbstractButton):
             bg_i18n = self.wprops.getAttribute(elem, "buttonGroup")
             if bg_i18n is not None:
-                bg_name = bg_i18n.string
+                # This should be handled properly in case the problem arises
+                # elsewhere as well.
+                try:
+                    # We are compiling the .ui file.
+                    bg_name = bg_i18n.string
+                except AttributeError:
+                    # We are loading the .ui file.
+                    bg_name = bg_i18n
 
                 for bg in self.button_groups:
                     if bg.objectName() == bg_name: