Old style exceptions are Python 3 syntax errors

Tools/run-clang-tidy.py

@@ -108,7 +108,7 @@ def run_tidy(args, tmpdir, build_path, queue):
 
     try:
       subprocess.check_call(invocation, stdin=None, stdout=open(os.devnull, 'wb'), stderr=subprocess.STDOUT)
-    except subprocess.CalledProcessError, e:
+    except subprocess.CalledProcessError as e:
       sys.stdout.write(' '.join(invocation) + '\n')
       subprocess.call(invocation)
       global tidy_failures

Tools/uorb_graph/create.py

@@ -518,7 +518,7 @@ class OutputGraphviz(object):
                             graph.edge('t_'+topic, 'm_'+module,
                                     color=topic_colors[topic])
 
-	graph.render(file_name, view=False)
+        graph.render(file_name, view=False)
 
 
 class OutputJSON(object):
@@ -633,6 +633,3 @@ elif args.output == 'graphviz':
     output_graphviz.write(args.file+'_pubs.fv', show_subscriptions=False, engine=engine)
 else:
     print('Error: unknown output format '+args.output)
-
-
-