Replace dict.iteritems() with six.iteritems()

dict.iteritems() was replaced with dict.items() in Python 3. Use the
six.iteritems() function to get code compatible with Python 2 and Python 3.

Change-Id: I0c8ecc3ae540ffaf4c6b159e09ca16ccf365973d

oslo/messaging/_drivers/amqp.py

@@ -29,6 +29,7 @@ import threading
 import uuid
 
 from oslo.config import cfg
+import six
 
 from oslo.messaging._drivers import common as rpc_common
 from oslo.messaging._drivers import pool
@@ -293,13 +294,12 @@ def pack_context(msg, context):
 
     """
     if isinstance(context, dict):
-        context_d = dict([('_context_%s' % key, value)
-                          for (key, value) in context.iteritems()])
+        context_d = six.iteritems(context)
     else:
-        context_d = dict([('_context_%s' % key, value)
-                          for (key, value) in context.to_dict().iteritems()])
+        context_d = six.iteritems(context.to_dict())
 
-    msg.update(context_d)
+    msg.update(('_context_%s' % key, value)
+               for (key, value) in context_d)
 
 
 class _MsgIdCache(object):

oslo/messaging/_drivers/common.py

@@ -97,7 +97,7 @@ class RPCException(Exception):
                 # kwargs doesn't match a variable in the message
                 # log the issue and the kwargs
                 LOG.exception(_('Exception in string format operation'))
-                for name, value in kwargs.iteritems():
+                for name, value in six.iteritems(kwargs):
                     LOG.error("%s: %s" % (name, value))
                 # at least get the core message out if something happened
                 message = self.msg_fmt

oslo/messaging/_drivers/impl_rabbit.py

@@ -440,7 +440,7 @@ class Connection(object):
                 'virtual_host': self.conf.rabbit_virtual_host,
             }
 
-            for sp_key, value in server_params.iteritems():
+            for sp_key, value in six.iteritems(server_params):
                 p_key = server_params_to_kombu_params.get(sp_key, sp_key)
                 params[p_key] = value
 

oslo/messaging/rpc/client.py

@@ -24,6 +24,7 @@ __all__ = [
 ]
 
 from oslo.config import cfg
+import six
 
 from oslo.messaging._drivers import base as driver_base
 from oslo.messaging import _utils as utils
@@ -98,7 +99,7 @@ class _CallContext(object):
         msg = dict(method=method)
 
         msg['args'] = dict()
-        for argname, arg in args.iteritems():
+        for argname, arg in six.iteritems(args):
             msg['args'][argname] = self.serializer.serialize_entity(ctxt, arg)
 
         if self.target.namespace is not None:

oslo/messaging/rpc/dispatcher.py

@@ -23,6 +23,8 @@ __all__ = [
     'UnsupportedVersion',
 ]
 
+import six
+
 from oslo.messaging import _utils as utils
 from oslo.messaging import localcontext
 from oslo.messaging import serializer as msg_serializer
@@ -85,7 +87,7 @@ class RPCDispatcher(object):
     def _dispatch(self, endpoint, method, ctxt, args):
         ctxt = self.serializer.deserialize_context(ctxt)
         new_args = dict()
-        for argname, arg in args.iteritems():
+        for argname, arg in six.iteritems(args):
             new_args[argname] = self.serializer.deserialize_entity(ctxt, arg)
         result = getattr(endpoint, method)(ctxt, **new_args)
         return self.serializer.serialize_entity(ctxt, result)

tests/utils.py

@@ -25,6 +25,7 @@ import os
 
 import fixtures
 from oslo.config import cfg
+import six
 import testtools
 
 from oslo.messaging.openstack.common.fixture import moxstubout
@@ -79,5 +80,5 @@ class BaseTestCase(testtools.TestCase):
         test by the tearDown() method.
         """
         group = kw.pop('group', None)
-        for k, v in kw.iteritems():
+        for k, v in six.iteritems(kw):
             self.conf.set_override(k, v, group)