Index: tools/opt-viewer/optpmap.py
===================================================================
--- tools/opt-viewer/optpmap.py
+++ tools/opt-viewer/optpmap.py
@@ -42,7 +42,7 @@
 
     func_and_args = [(func, arg, should_print_progress,) for arg in iterable]
     if processes == 1:
-        result = map(_wrapped_func, func_and_args, *args, **kwargs)
+        result = list(map(_wrapped_func, func_and_args, *args, **kwargs))
     else:
         pool = multiprocessing.Pool(initializer=_init,
                                     initargs=(_current, _total,),
Index: utils/schedcover.py
===================================================================
--- utils/schedcover.py
+++ utils/schedcover.py
@@ -39,7 +39,7 @@
     ordered_table  = sorted(table.items(), key=operator.itemgetter(0))
     ordered_models = ["itinerary", "default"]
     ordered_models.extend(sorted(models))
-    ordered_models = filter(filter_model, ordered_models)
+    ordered_models = [m for m in ordered_models if filter_model(m)]
 
     # print header
     sys.stdout.write("instruction")