Remove redundant default value None for dict.get

The default value for dict.get is None, no need to specify again.

Change-Id: I86006df029c0275da1aad0109b4390fdca19d967

heat/api/cfn/v1/stacks.py

@@ -501,7 +501,7 @@ class StackController(object):
             return self._id_format(result)
 
         con = req.context
-        stack_name = req.params.get('StackName', None)
+        stack_name = req.params.get('StackName')
         try:
             identity = stack_name and self._get_identity(con, stack_name)
             events = self.engine_rpcapi.list_events(con, identity)

heat/api/openstack/v1/stacks.py

@@ -343,7 +343,7 @@ class StackController(object):
         """
         Returns a list of valid resource types that may be used in a template.
         """
-        support_status = req.params.get('support_status', None)
+        support_status = req.params.get('support_status')
         return {
             'resource_types':
             self.engine.list_resource_types(req.context, support_status)}

heat/engine/resources/neutron/security_group.py

@@ -174,7 +174,7 @@ class SecurityGroup(neutron.NeutronResource):
                 rule[self.RULE_REMOTE_GROUP_ID] = None
 
         for key in (self.RULE_PORT_RANGE_MIN, self.RULE_PORT_RANGE_MAX):
-            if rule.get(key, None) is not None:
+            if rule.get(key) is not None:
                 rule[key] = str(rule[key])
         return rule
 

heat/tests/v1_1/fakes.py

@@ -60,7 +60,7 @@ class FakeHTTPClient(base_client.HTTPClient):
                                  (method, url, callback))
 
         # Note the call
-        self.callstack.append((method, url, kwargs.get('body', None)))
+        self.callstack.append((method, url, kwargs.get('body')))
 
         status, body = getattr(self, callback)(**kwargs)
         if hasattr(status, 'items'):