Merge 3.1

Lib/test/test_codecs.py

@@ -514,13 +514,11 @@ class UTF16Test(ReadTest):
         s1 = 'Hello\r\nworld\r\n'
 
         s = s1.encode(self.encoding)
-        try:
+        self.addCleanup(support.unlink, support.TESTFN)
         with open(support.TESTFN, 'wb') as fp:
             fp.write(s)
         with codecs.open(support.TESTFN, 'U', encoding=self.encoding) as reader:
             self.assertEqual(reader.read(), s1)
-        finally:
-            support.unlink(support.TESTFN)
 
 class UTF16LETest(ReadTest):
     encoding = "utf-16-le"
@@ -1624,6 +1622,7 @@ class BomTest(unittest.TestCase):
                  "utf-32",
                  "utf-32-le",
                  "utf-32-be")
+        self.addCleanup(support.unlink, support.TESTFN)
         for encoding in tests:
             # Check if the BOM is written only once
             with codecs.open(support.TESTFN, 'w+', encoding=encoding) as f: