#2503 make singletons compared with "is" not == or !=
Thanks to Wummel for the patch
diff --git a/Lib/test/test_pyclbr.py b/Lib/test/test_pyclbr.py
index d1291a0..d747f2f 100644
--- a/Lib/test/test_pyclbr.py
+++ b/Lib/test/test_pyclbr.py
@@ -57,7 +57,7 @@
             ignore are ignored.   If no module is provided, the appropriate
             module is loaded with __import__.'''
 
-        if module == None:
+        if module is None:
             # Import it.
             # ('<silly>' is to work around an API silliness in __import__)
             module = __import__(moduleName, globals(), {}, ['<silly>'])