Python 3.1

Core and Builtins
-----------------

- Issue #6334: Fix bug in range length calculation for ranges with
large arguments.

- Issue #6329: Fixed iteration for memoryview objects (it was being blocked
because it wasn't recognized as a sequence).

Library
-------

- Issue #6314: logging.basicConfig() performs extra checks on the "level"
argument.

- Issue #6274: Fixed possible file descriptors leak in subprocess.py

- Accessing io.StringIO.buffer now raises an AttributeError instead of
io.UnsupportedOperation.

- Issue #6271: mmap tried to close invalid file handle (-1) when anonymous.
(On Unix)

- Issue #1202: zipfile module would cause a struct.error when attempting to
store files with a CRC32 > 2**31-1.

Extension Modules
-----------------

- Issue #5590: Remove unused global variable in pyexpat extension.