Code formatting change.

Lib/unittest/case.py

@@ -163,6 +163,7 @@ class TestCase(object):
     # This attribute sets the maximum length of a diff in failure messsages
     # by assert methods using difflib. It is looked up as an instance attribute
     # so can be configured by individual tests if required.
+
     maxDiff = 80*8
 
     # Attribute used by TestSuite for classSetUp