commit b29614e047110f4d9af993a6cdec4e3fb7ef9738
author Benjamin Peterson <benjamin@python.org> Tue Oct 09 11:16:03 2012 -0400
committer Benjamin Peterson <benjamin@python.org> Tue Oct 09 11:16:03 2012 -0400
tree a15a5ac7b508c5033f640123f498a322f44b04ce
parent a5119351519926971240f61d0c23a5fc5d00743e

compare singletons by identity not equality (closes #16712)

Patch from Serhiy Storchaka.

Lib/test/support.py

diff --git a/Lib/test/support.py b/Lib/test/support.py
index 014bcf5..c5640e0 100644
--- a/Lib/test/support.py
+++ b/Lib/test/support.py
@@ -1232,7 +1232,7 @@
             try:
                 return func(*args, **kwds)
             finally:
-                if orig_tz == None:
+                if orig_tz is None:
                     del os.environ['TZ']
                 else:
                     os.environ['TZ'] = orig_tz