--- a/tests/check-perf-code.py	Sat May 06 04:51:25 2017 +0530
+++ b/tests/check-perf-code.py	Fri Feb 10 16:56:29 2017 -0800
@@ -26,7 +26,7 @@
     replacement = [('.py', ''), ('.c', ''), # trim suffix
                    ('mercurial%s' % (os.sep), ''), # trim "mercurial/" path
                   ]
-    ignored = set(['__init__'])
+    ignored = {'__init__'}
     modules = {}
 
     # convert from file name to module name, and count # of appearances