Fix common.scheduler.base_weight.BaseWeigher to be Python3 compatible

Use six.with_metaclass to create the metaclass.

Change-Id: I35402d0ce81799fef23849bbb01fa183e145b954

openstack/common/scheduler/base_weight.py

@@ -19,6 +19,8 @@ Pluggable Weighing support
 
 import abc
 
+import six
+
 from openstack.common.scheduler import base_handler
 
 
@@ -61,7 +63,7 @@ class WeighedObject(object):
         return "<WeighedObject '%s': %s>" % (self.obj, self.weight)
 
 
-class BaseWeigher(object):
+class BaseWeigher(six.with_metaclass(abc.ABCMeta, object)):
     """Base class for pluggable weighers.
 
     The attributes maxval and minval can be specified to set up the maximum
@@ -70,8 +72,6 @@ class BaseWeigher(object):
     from the calculated weights.
     """
 
-    __metaclass__ = abc.ABCMeta
-
     minval = None
     maxval = None
 

tox.ini

@@ -75,6 +75,7 @@ commands =
             tests/unit/rpc/test_dispatcher.py \
             tests/unit/scheduler/test_base_filter.py \
             tests/unit/scheduler/test_host_filters.py \
+            tests/unit/scheduler/test_weights.py \
             tests/unit/test_cfgfilter.py \
             tests/unit/test_context.py \
             tests/unit/test_deprecated.py \