Breaking ground for PEP 3137 implementation:

Get rid of buffer().  Use memoryview() in its place where possible.
In a few places, do things a bit different, because memoryview()
can't slice (yet).

Lib/test/test_unicode.py

@@ -713,7 +713,7 @@ class UnicodeTest(
         if not sys.platform.startswith('java'):
             self.assertEqual(
                 str(
-                    buffer(b'character buffers are decoded to unicode'),
+                    memoryview(b'character buffers are decoded to unicode'),
                     'utf-8',
                     'strict'
                 ),