Core and Builtins
-----------------
-- Issue #14775: Fix a potential quadratic dict build-up due to the garbage
- collector repeatedly trying to untrack dicts.
+- Issue #11022: open() and io.TextIOWrapper are now calling
+ locale.getpreferredencoding(False) instead of locale.getpreferredencoding()
+ in text mode if the encoding is not specified. Don't change temporary the
+ locale encoding using locale.setlocale(), use the current locale encoding
+ instead of the user preferred encoding.
-- Issue #14494: Fix __future__.py and its documentation to note that
- absolute imports are the default behavior in 3.0 instead of 2.7.
- Patch by Sven Marnach.
+- Issue #14673: Add Eric Snow's sys.implementation implementation.
-- Issue #14761: Fix potential leak on an error case in the import machinery.
+Library
+-------
-- Issue #14699: Fix calling the classmethod descriptor directly.
++- Issue #13854: Make multiprocessing properly handle non-integer
++ non-string argument to SystemExit.
+
-- Issue #14433: Prevent msvcrt crash in interactive prompt when stdin
- is closed.
++- Issue #12157: Make pool.map() empty iterables correctly. Initial
++ patch by mouad.
+
-- Issue #11603 (again): Setting __repr__ to __str__ now raises a RuntimeError
- when repr() or str() is called on such an object.
+- Issue #11823: disassembly now shows argument counts on calls with keyword args.
-- Issue #14658: Fix binding a special method to a builtin implementation of a
- special method with a different name.
+- Issue #14711: os.stat_float_times() has been deprecated.
-- Issue #14630: Fix a memory access bug for instances of a subclass of int
- with value 0.
+- LZMAFile now accepts the modes "rb"/"wb"/"ab" as synonyms of "r"/"w"/"a".
-- Issue #14612: Fix jumping around with blocks by setting f_lineno.
+- The bz2 and lzma modules now each contain an open() function, allowing
+ compressed files to readily be opened in text mode as well as binary mode.
-- Issue #14607: Fix keyword-only arguments which started with ``__``.
+- BZ2File.__init__() and LZMAFile.__init__() now accept a file object as their
+ first argument, rather than requiring a separate "fileobj" argument.
-- Issue #13889: Check and (if necessary) set FPU control word before calling
- any of the dtoa.c string <-> float conversion functions, on MSVC builds of
- Python. This fixes issues when embedding Python in a Delphi app.
+- gzip.open() now accepts file objects as well as filenames.
-- Issue #14474: Save and restore exception state in thread.start_new_thread()
- while writing error message if the thread leaves a unhandled exception.
+- Issue #14992: os.makedirs(path, exist_ok=True) would raise an OSError
+ when the path existed and had the S_ISGID mode bit set when it was
+ not explicitly asked for. This is no longer an exception as mkdir
+ cannot control if the OS sets that bit for it or not.
-- Issue #13019: Fix potential reference leaks in bytearray.extend(). Patch
- by Suman Saha.
+- Issue #14989: Make the CGI enable option to http.server available via command
+ line.
-- Issue #14378: Fix compiling ast.ImportFrom nodes with a "__future__" string as
- the module name that was not interned.
+- Issue #14987: Add a missing import statement to inspect.
-- Issue #14331: Use significantly less stack space when importing modules by
- allocating path buffers on the heap instead of the stack.
+- Issue #1079: email.header.decode_header now correctly parses all the examples
+ in RFC2047. There is a necessary visible behavior change: the leading and/or
+ trailing whitespace on ASCII parts is now preserved.
-- Issue #14334: Prevent in a segfault in type.__getattribute__ when it was not
- passed strings.
+- Issue #14969: Better handling of exception chaining in contextlib.ExitStack
-- Issue #1469629: Allow cycles through an object's __dict__ slot to be
- collected. (For example if ``x.__dict__ is x``).
+- Issue #14962: Update text coloring in IDLE shell window after changing
+ options. Patch by Roger Serwy.
-- Issue #14172: Fix reference leak when marshalling a buffer-like object
- (other than a bytes object).
+- Issue #14963: Convert contextlib.ExitStack.__exit__ to use an iterative
+ algorithm (Patch by Alon Horev)
-- Issue #13521: dict.setdefault() now does only one lookup for the given key,
- making it "atomic" for many purposes. Patch by Filip Gruszczyński.
+Extension Modules
+-----------------
-- Issue #14471: Fix a possible buffer overrun in the winreg module.
+- Issue #15000: Support the "unique" x32 architecture in _posixsubprocess.c.
-Library
--------
+Tests
+-----
-- Issue #13854: Make multiprocessing properly handle non-integer
- non-string argument to SystemExit.
+- Issue #14963 (partial): Add test cases for exception handling behaviour
+ in contextlib.ExitStack (Initial patch by Alon Horev)
-- Issue #12157: Make pool.map() empty iterables correctly. Initial
- patch by mouad.
-- Issue #14992: os.makedirs(path, exist_ok=True) would raise an OSError
- when the path existed and had the S_ISGID mode bit set when it was
- not explicitly asked for. This is no longer an exception as mkdir
- cannot control if the OS sets that bit for it or not.
+What's New in Python 3.3.0 Alpha 4?
+===================================
-- Issue #14962: Update text coloring in IDLE shell window after changing
- options. Patch by Roger Serwy.
+*Release date: 31-May-2012*
+
+Core and Builtins
+-----------------
+
+- Issue #14835: Make plistlib output empty arrays & dicts like OS X.
+ Patch by Sidney San Martín.
+
+- Issue #14744: Use the new _PyUnicodeWriter internal API to speed up
+ str%args and str.format(args).
+
+- Issue #14930: Make memoryview objects weakrefable.
+
+- Issue #14775: Fix a potential quadratic dict build-up due to the garbage
+ collector repeatedly trying to untrack dicts.
+
+- Issue #14857: fix regression in references to PEP 3135 implicit __class__
+ closure variable (Reopens issue #12370)
+
+- Issue #14712 (PEP 405): Virtual environments. Implemented by Vinay Sajip.
+
+- Issue #14660 (PEP 420): Namespace packages. Implemented by Eric Smith.
+
+- Issue #14494: Fix __future__.py and its documentation to note that
+ absolute imports are the default behavior in 3.0 instead of 2.7.
+ Patch by Sven Marnach.
+
+- Issue #9260: A finer-grained import lock. Most of the import sequence
+ now uses per-module locks rather than the global import lock, eliminating
+ well-known issues with threads and imports.
+
+- Issue #14624: UTF-16 decoding is now 3x to 4x faster on various inputs.
+ Patch by Serhiy Storchaka.
+
+- asdl_seq and asdl_int_seq are now Py_ssize_t sized.
+
+- Issue #14133 (PEP 415): Implement suppression of __context__ display with an
+ attribute on BaseException. This replaces the original mechanism of PEP 409.
+
+- Issue #14417: Mutating a dict during lookup now restarts the lookup instead
+ of raising a RuntimeError (undoes issue #14205).
+
+- Issue #14738: Speed-up UTF-8 decoding on non-ASCII data. Patch by Serhiy
+ Storchaka.
+
+- Issue #14700: Fix two broken and undefined-behaviour-inducing overflow checks
+ in old-style string formatting.
+
+- Issue #14705: The PyArg_Parse() family of functions now support the 'p' format
+ unit, which accepts a "boolean predicate" argument. It converts any Python
+ value into an integer--0 if it is "false", and 1 otherwise.
+
+Library
+-------
+
+- Issue #14690: Use monotonic clock instead of system clock in the sched,
+ subprocess and trace modules.
+
+- Issue #14958: Change IDLE systax highlighting to recognize all string and
+ byte literals supported in Python 3.3.
- Issue #10997: Prevent a duplicate entry in IDLE's "Recent Files" menu.
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