Whitespace normalization.  Leaving tokenize_tests.py alone for now.
diff --git a/Lib/test/string_tests.py b/Lib/test/string_tests.py
index 067ccca..c3010d6 100644
--- a/Lib/test/string_tests.py
+++ b/Lib/test/string_tests.py
@@ -56,7 +56,7 @@
 
     test('count', 'aaa', 3, 'a')
     test('count', 'aaa', 0, 'b')
-    
+
     test('find', 'abcdefghiabc', 0, 'abc')
     test('find', 'abcdefghiabc', 9, 'abc', 1)
     test('find', 'abcdefghiabc', -1, 'def', 4)