Update the code to better reflect recommended style:

Use != instead of <> since <> is documented as "obsolescent".
Use "is" and "is not" when comparing with None or type objects.

Lib/test/test_mmap.py

@@ -46,7 +46,7 @@ def test_both():
 
     # Test doing a regular expression match in an mmap'ed file
     match=re.search('[A-Za-z]+', m)
-    if match == None:
+    if match is None:
         print '  ERROR: regex match on mmap failed!'
     else:
         start, end = match.span(0)