--- a/_exceptions.py	Tue Mar 19 16:56:46 2013 +0100
+++ b/_exceptions.py	Wed Mar 20 17:40:25 2013 +0100
@@ -1,4 +1,4 @@
-# copyright 2003-2011 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
+# copyright 2003-2012 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
 # contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
 #
 # This file is part of CubicWeb.
@@ -19,7 +19,7 @@
 
 __docformat__ = "restructuredtext en"
 
-from yams import ValidationError
+from yams import ValidationError as ValidationError
 
 # abstract exceptions #########################################################
 
@@ -100,7 +100,7 @@
             if self.args:
                 return ' '.join(self.args)
             return self.msg
-        except Exception, ex:
+        except Exception as ex:
             return str(ex)
 
 class Forbidden(SecurityError):