From fc1de88d9856d01df85d2c8784552f9f46a8cb8a Mon Sep 17 00:00:00 2001
From: Christian Berendt <berendt@b1-systems.de>
Date: Tue, 3 Jun 2014 15:53:02 +0200
Subject: [PATCH] Use six.add_metaclass instead of __metaclass__

According to http://docs.openstack.org/developer/hacking/ it should
be preferred to use six.add_metaclass instead of __metaclass__.

Change-Id: I1775035ea998b78a52c28ffe71dda2ede1377b31
---
 heat/engine/function.py | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/heat/engine/function.py b/heat/engine/function.py
index 50eff9386..59d2de634 100644
--- a/heat/engine/function.py
+++ b/heat/engine/function.py
@@ -15,14 +15,15 @@ import abc
 import collections
 import itertools
 
+import six
 
+
+@six.add_metaclass(abc.ABCMeta)
 class Function(object):
     """
     Abstract base class for template functions.
     """
 
-    __metaclass__ = abc.ABCMeta
-
     def __init__(self, stack, fn_name, args):
         """
         Initialise with a Stack, the function name and the arguments.