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/unittest/case.py

diff --git a/Lib/unittest/case.py b/Lib/unittest/case.py
index 28f0a2d..f334865 100644
--- a/Lib/unittest/case.py
+++ b/Lib/unittest/case.py
@@ -736,7 +736,7 @@
             msg: Optional message to use on failure instead of a list of
                     differences.
         """
-        if seq_type != None:
+        if seq_type is not None:
             seq_type_name = seq_type.__name__
             if not isinstance(seq1, seq_type):
                 raise self.failureException('First sequence is not a %s: %s'