summaryrefslogtreecommitdiffstats
path: root/Misc/NEWS
blob: 232d5c399762b4411de9fab07e163fbd98b24f7d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
+++++++++++
Python News
+++++++++++

(editors: check NEWS.help for information about editing NEWS using ReST.)

What's new in Python 3.0b2?
===========================

*Release date: XX-XXX-2008*

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

- Issue #3382: Make '%F' and float.__format__('F') convert results
  to uppercase.

- Issue #3008: the float type has a new instance method 'float.hex'
  and a new class method 'float.fromhex' to convert floating-point
  numbers to and from hexadecimal strings, respectively.

- Issue #3083: Add alternate (#) formatting for bin, oct, hex output
  for str.format().  This adds the prefix 0b, 0o, or 0x, respectively.

- Issue #3280: like chr(), the "%c" format now accepts unicode code points
  beyond the Basic Multilingual Plane (above 0xffff) on all configurations. On
  "narrow Unicode" builds, the result is a string of 2 code units, forming a
  UTF-16 surrogate pair.

- Issue #3282: str.isprintable() should return False for undefined
  Unicode characters.

- Issue #3236: Return small longs from PyLong_FromString.

- Exception tracebacks now support exception chaining.

Library
-------

- Issue #3313: Fixed a crash when a failed dlopen() call does not set
  a valid dlerror() message.

- Issue #3258: Fixed a crash when a ctypes POINTER type to an
  incomplete structure was created.

- Issue #2683: Fix inconsistency in subprocess.Popen.communicate(): the
  argument now must be a bytes object in any case.

- Issue #3145: help("modules whatever") failed when trying to load the source
  code of every single module of the standard library, including invalid files
  used in the test suite.

- The gettext library now consistently uses Unicode strings for message ids
  and message strings, and ``ugettext()`` and the like don't exist anymore.

- The traceback module has been expanded to handle chained exceptions.

C API
-----

- Issue #3247: the function Py_FindMethod was removed. Modern types should
  use the tp_methods slot instead.

Tools/Demos
-----------

- The Mac/Demos directory has been removed.

- All of the Mac scripts have been removed (including BuildApplet.py).


What's new in Python 3.0b1?
===========================

*Release date: 18-Jun-2008*

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

- Issue #3211: warnings.warn_explicit() did not guard against its 'registry'
  argument being anything other than a dict or None. Also fixed a bug in error
  handling when 'message' and 'category' were both set to None, triggering a
  bus error.

- Issue #3100: Corrected a crash on deallocation of a subclassed weakref which
  holds the last (strong) reference to its referent.

- Issue #2630: implement PEP 3138. repr() now returns printable
  Unicode characters unescaped, to get an ASCII-only representation
  of an object use ascii().

- Issue #1342: On windows, Python could not start when installed in a
  directory with non-ascii characters.

- Implement PEP 3121: new module initialization and finalization API.

- Removed the already-defunct ``-t`` option.

- Issue #2957: Corrected a ValueError "recursion limit exceeded", when
  unmarshalling many code objects, which happens when importing a
  large .pyc file (~1000 functions).

- Issue #2963: fix merging oversight that disabled method cache for
  all types.

- Issue #2964: fix a missing INCREF in instancemethod_descr_get.

- Issue #2895: Don't crash when given bytes objects as keyword names.

- Issue #2798: When parsing arguments with PyArg_ParseTuple, the "s"
  code now allows any unicode string and returns a utf-8 encoded
  buffer, just like the "s#" code already does.  The "z" code was
  corrected as well.

- Issue #2863: generators now have a ``gen.__name__`` attribute that
  equals ``gen.gi_code.co_name``, like ``func.__name___`` that equals
  ``func.func_code.co_name``.  The repr() of a generator now also
  contains this name.

- Issue #2831: enumerate() now has a ``start`` argument.

- Issue #2801: fix bug in the float.is_integer method where a
  ValueError was sometimes incorrectly raised.

- The ``--with-toolbox-glue`` option (and the associated
  pymactoolbox.h) have been removed.

- Issue #2196: hasattr() now lets exceptions which do not inherit
  Exception (KeyboardInterrupt, and SystemExit) propagate instead of
  ignoring them.

- #3021 Exception reraising sematics have been significantly improved.  However,
  f_exc_type, f_exc_value, and f_exc_traceback cannot be accessed from Python
  code anymore.

- Three of PyNumberMethods' members, nb_coerce, nb_hex, and nb_oct, have been
  removed.

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

- Renamed ``_winreg`` module to ``winreg``.

- Support os.O_ASYNC and fcntl.FASYNC if the constants exist on the
  platform.

- Support for Windows 9x has been removed from the winsound module.

- Issue #2870: cmathmodule.c compile error.

Library
-------

- Patch #3133: http.server.CGIHTTPRequestHandler did not work on windows.

- a new ``urllib`` package was created.  It consists of code from
  ``urllib``, ``urllib2``, ``urlparse``, and ``robotparser``.  The old
  modules have all been removed.  The new package has five submodules:
  ``urllib.parse``, ``urllib.request``, ``urllib.response``,
  ``urllib.error``, and ``urllib.robotparser``.  The
  ``urllib.request.urlopen()`` function uses the url opener from
  ``urllib2``.  (Note that the unittests have not been renamed for the
  beta, but they will be renamed in the future.)

- rfc822 has been removed in favor of the email package.

- mimetools has been removed in favor of the email package.

- Patch #2849: Remove use of rfc822 module from standard library.

- Added C optimized implementation of io.StringIO.

- The ``pickle`` module is now automatically use an optimized C
  implementation of Pickler and Unpickler when available. The
  ``cPickle`` module is no longer needed.

- Removed the ``htmllib`` and ``sgmllib`` modules.

- The deprecated ``SmartCookie`` and ``SimpleCookie`` classes have
  been removed from ``http.cookies``.

- The ``commands`` module has been removed. Its getoutput() and
  getstatusoutput() functions have been moved to the ``subprocess`` module.

- The ``http`` package was created; it contains the old ``httplib``
  as ``http.client``, ``Cookie`` as ``http.cookies``, ``cookielib``
  as ``http.cookiejar``, and the content of the three ``HTTPServer``
  modules as ``http.server``.

- The ``xmlrpc`` package was created; it contains the old
  ``xmlrpclib`` module as ``xmlrpc.client`` and the content of
  the old ``SimpleXMLRPCServer`` and ``DocXMLRPCServer`` modules
  as ``xmlrpc.server``.  

- The ``dbm`` package was created, containing the old modules
  ``anydbm`` and ``whichdb`` in its ``__init__.py``, and having
  ``dbm.gnu`` (was ``gdbm``), ``dbm.bsd`` (was ``dbhash``),
  ``dbm.ndbm`` (was ``dbm``) and ``dbm.dumb`` (was ``dumbdbm``)
  as submodules.

- The ``repr`` module has been renamed to ``reprlib``.

- The ``statvfs`` module has been removed.

- Issue #1713041: fix pprint's handling of maximum depth.

- Issue #2250: Exceptions raised during evaluation of names in
  rlcompleter's ``Completer.complete()`` method are now caught and
  ignored.

- Patch #2659: Added ``break_on_hyphens`` option to textwrap's
  ``TextWrapper`` class.

- Issue #2487: change the semantics of math.ldexp(x, n) when n is too
  large to fit in a C long.  ldexp(x, n) now returns a zero (with
  suitable sign) if n is large and negative; previously, it raised
  OverflowError.

- The ``ConfigParser`` module has been renamed to ``configparser``.

- Issue #2865: webbrowser.open() works again in a KDE environment.

- The ``multifile`` module has been removed.

- The ``SocketServer`` module has been renamed to ``socketserver``.

- Fixed the ``__all__`` setting on ``collections`` to include
  ``UserList`` and ``UserString``.

- The sre module has been removed.

- The Queue module has been renamed to queue.

- The copy_reg module has been renamed to copyreg.

- The mhlib module has been removed.

- The ihooks module has been removed.

- The fpformat module has been removed.

- The dircache module has been removed.

- The Canvas module has been removed.

- The Decimal module gained the magic methods __round__, __ceil__,
  __floor__ and __trunc__, to give support for round, math.ceil,
  math.floor and math.trunc.

- The user module has been removed.

- The mutex module has been removed.

- The imputil module has been removed.

- os.path.walk has been removed in favor of os.walk.

- pdb gained the "until" command.

- The test.test_support module has been renamed to test.support.

- The threading module API was renamed to be PEP 8 complaint.

Tools/Demos
-----------

- The bgen tool has been removed.

Build
-----


What's New in Python 3.0a5?
===========================

*Release date: 08-May-2008*

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

- Fixed misbehaviour of PyLong_FromSsize_t on systems where
  sizeof(size_t) > sizeof(long).

- Issue #2221: Corrected a SystemError "error return without exception
  set", when the code executed by exec() raises an exception, and
  sys.stdout.flush() also raises an error.

- Bug #2565: The repr() of type objects now calls them 'class', not
  'type' - whether they are builtin types or not.

- The command line processing was converted to pass Unicode strings
  through as unmodified as possible; as a consequence, the C API
  related to command line arguments was changed to use wchar_t.

- All backslashes in raw strings are interpreted literally.  This
  means that '\u' and '\U' escapes are not treated specially.

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

Library
-------

- ctypes objects now support the PEP3118 buffer interface.

- Issue #2682: ctypes callback functions now longer contain a cyclic
  reference to themselves.

- Issue #2058: Remove the buf attribute and add __slots__ to the
  TarInfo class in order to reduce tarfile's memory usage.

- Bug #2606: Avoid calling .sort() on a dict_keys object.

- The bundled libffi copy is now in sync with the recently released
  libffi3.0.5 version, apart from some small changes to
  Modules/_ctypes/libffi/configure.ac.

Build
-----

- Issue #1496032: On alpha, use -mieee when gcc is the compiler.

- "make install" is now an alias for "make altinstall", to prevent
  accidentally overwriting a Python 2.x installation.  Use "make
  fullinstall" to force Python 3.0 to be installed as "python".

- Issue #2544: On HP-UX systems, use 'gcc -shared' for linking when
  gcc is used as compiler.


What's New in Python 3.0a4?
===========================

*Release date: 02-Apr-2008*

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

- Bug #2301: Don't try decoding the source code into the original
  encoding for syntax errors.

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

- The dl module was removed, use the ctypes module instead.

- Use wchar_t functions in _locale module.

Library
-------

- The class distutils.commands.build_py.build_py_2to3 can be used as a
  build_py replacement to automatically run 2to3 on modules that are
  going to be installed.

- A new pickle protocol (protocol 3) is added with explicit support
  for bytes.  This is the default protocol.  It intentionally cannot
  be unpickled by Python 2.x.

- When a pickle written by Python 2.x contains an (8-bit) str
  instance, this is now decoded to a (Unicode) str instance.  The
  encoding used to do this defaults to ASCII, but can be overridden
  via two new keyword arguments to the Unpickler class.  Previously
  this would create bytes instances, which is usually wrong: str
  instances are often used to pickle attribute names etc., and text is
  more common than binary data anyway.

- Default to ASCII as the locale.getpreferredencoding, if the POSIX
  system doesn't support CODESET and LANG isn't set or doesn't allow
  deduction of an encoding.

- Issue #1202: zlib.crc32 and zlib.adler32 now return an unsigned
  value.

- Issue #719888: Updated tokenize to use a bytes API.  generate_tokens
  has been renamed tokenize and now works with bytes rather than
  strings.  A new detect_encoding function has been added for
  determining source file encoding according to PEP-0263.  Token
  sequences returned by tokenize always start with an ENCODING token
  which specifies the encoding used to decode the file.  This token is
  used to encode the output of untokenize back to bytes.


What's New in Python 3.0a3?
===========================

*Release date: 29-Feb-2008*

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

- Issue #2282: io.TextIOWrapper was not overriding seekable() from
  io.IOBase.

- Issue #2115: Important speedup in setting __slot__ attributes.  Also
  prevent a possible crash: an Abstract Base Class would try to access
  a slot on a registered virtual subclass.

- Fixed repr() and str() of complex numbers with infinity or nan as
  real or imaginary part.

- Clear all free list during a gc.collect() of the highest generation
  in order to allow pymalloc to free more arenas. Python may give back
  memory to the OS earlier.

- Issue #2045: Fix an infinite recursion triggered when printing a
  subclass of collections.defaultdict, if its default_factory is set
  to a bound method.

- Fixed a minor memory leak in dictobject.c. The content of the free
  list was not freed on interpreter shutdown.

- Limit free list of method and builtin function objects to 256
  entries each.

- Patch #1953: Added ``sys._compact_freelists()`` and the C API
  functions ``PyInt_CompactFreeList`` and ``PyFloat_CompactFreeList``
  to compact the internal free lists of pre-allocted ints and floats.

- Bug #1983: Fixed return type of fork(), fork1() and forkpty() calls.
  Python expected the return type int but the fork familie returns
  pi_t.

- Issue #1678380: Fix a bug that identifies 0j and -0j when they
  appear in the same code unit.

- Issue #2025: Added tuple.count() and tuple.index() methods to comply
  with the collections.Sequence API.

- Fixed multiple reinitialization of the Python interpreter. The small
  int list in longobject.c has caused a seg fault during the third
  finalization.

- Issue #1973: bytes.fromhex('') raised SystemError.

- Issue #1771: remove cmp parameter from sorted() and list.sort().

- Issue #1969: split and rsplit in bytearray are inconsistent.

- map() no longer accepts None for the first argument.  Use zip()
  instead.

- Issue #1769: Now int("- 1") is not allowed any more.

- Object/longobject.c: long(float('nan')) raises an OverflowError
  instead of returning 0.

- Issue #1762972: __file__ points to the source file instead of the
  pyc/pyo file if the py file exists.

- Issue #1393: object_richcompare() returns NotImplemented instead of
  False if the objects aren't equal, to give the other side a chance.

- Issue #1692: Interpreter was not displaying location of SyntaxError.

- Improve some exception messages when Windows fails to load an
  extension module.  Now we get for example '%1 is not a valid Win32
  application' instead of 'error code 193'.  Also use Unicode strings
  to deal with non-English locales.

- Issue #1587: Added instancemethod wrapper for PyCFunctions. The
  Python C API has gained a new type *PyInstanceMethod_Type* and the
  functions *PyInstanceMethod_Check(o)*, *PyInstanceMethod_New(func)*
  and *PyInstanceMethod_Function(im)*.

- Constants gc.DEBUG_OBJECT and gc.DEBUG_INSTANCE have been removed
  from the gc module; gc.DEBUG_COLLECTABLE or gc.DEBUG_UNCOLLECTABLE
  are now enough to print the corresponding list of objects considered
  by the garbage collector.

- Issue #1573: Improper use of the keyword-only syntax makes the
  parser crash.

- Issue #1564: The set implementation should special-case PyUnicode
  instead of PyString.

- Patch #1031213: Decode source line in SyntaxErrors back to its
  original source encoding.

- inspect.getsource() includes the decorators again.

- Bug #1713: posixpath.ismount() claims symlink to a mountpoint is a
  mountpoint.

- Fix utf-8-sig incremental decoder, which didn't recognise a BOM when
  the first chunk fed to the decoder started with a BOM, but was
  longer than 3 bytes.

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

- Code for itertools ifilter(), imap(), and izip() moved to bultins
  and renamed to filter(), map(), and zip().  Also, renamed
  izip_longest() to zip_longest() and ifilterfalse() to filterfalse().

- Issue #1762972: Readded the reload() function as imp.reload().

- Bug #2111: mmap segfaults when trying to write a block opened with
  PROT_READ.

- Issue #2063: correct order of utime and stime in os.times() result
  on Windows.

Library
-------

- Weakref dictionaries now inherit from MutableMapping.

- Created new UserDict class in collections module.  This one inherits
  from and complies with the MutableMapping ABC.  Also, moved
  UserString and UserList to the collections module.  The
  MutableUserString class was removed.

- Removed UserDict.DictMixin.  Replaced all its uses with
  collections.MutableMapping.

- Issue #1703: getpass() should flush after writing prompt.

- Issue #1585: IDLE uses non-existent xrange() function.

- Issue #1578: Problems in win_getpass.

Build
-----

- Renamed --enable-unicode configure flag to --with-wide-unicode,
  since Unicode strings can't be disabled anymore.

C API
-----

- Issue #1629: Renamed Py_Size, Py_Type and Py_Refcnt to Py_SIZE,
  Py_TYPE and Py_REFCNT.

- New API PyImport_ImportModuleNoBlock(), works like
  PyImport_ImportModule() but won't block on the import lock
  (returning an error instead).


What's New in Python 3.0a2?
===========================

*Release date: 07-Dec-2007*

(Note: this list is incomplete.)

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

- str8 now has the same construction signature as bytes.

- Comparisons between str and str8 now return False/True for ==/!=.
  sqlite3 returns str8 when recreating on object from it's __conform__
  value.  The struct module returns str8 for all string-related
  formats.  This was true before this change, but becomes more
  apparent thanks to string comparisons always being False.

- Replaced `PyFile_FromFile()` with `PyFile_FromFd(fd, name. mode,
  buffer, encoding, newline)`.

- Fixed `imp.find_module()` to obey the -*- coding: -*- header.

- Changed `__file__` and `co_filename` to unicode. The path names are decoded
  with `Py_FileSystemDefaultEncoding` and a new API method 
  `PyUnicode_DecodeFSDefault(char*)` was added.

- io.open() and _fileio.FileIO have grown a new argument closefd. A
  false value disables the closing of the file descriptor.

- Added a new option -b to issues warnings (-bb for errors) about
  certain operations between bytes/buffer and str like str(b'') and
  comparison.

- The standards streams sys.stdin, stdout and stderr may be None when
  the when the C runtime library returns an invalid file descriptor
  for the streams (fileno(stdin) < 0). For now this happens only for
  Windows GUI apps and scripts started with `pythonw.exe`.

- Added PCbuild9 directory for VS 2008.

- Renamed structmember.h WRITE_RESTRICTED to PY_WRITE_RESTRICTED to
  work around a name clash with VS 2008 on Windows.

- Unbound methods are gone for good. ClassObject.method returns an
  ordinary function object, instance.method still returns a bound
  method object.  The API of bound methods is cleaned up, too. The
  im_class attribute is removed and im_func + im_self are renamed to
  __func__ and __self__. The factory PyMethod_New takes only func and
  instance as argument.

- intobject.h is no longer included by Python.h. The remains were
  moved to longobject.h. It still exists to define several aliases
  from PyInt_ to PyLong_ functions.

- Removed sys.maxint, use sys.maxsize instead.

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

- The `hotshot` profiler has been removed; use `cProfile` instead.

Library
-------

- When loading an external file using testfile(), the passed-in
  encoding argument was being ignored if __loader__ is defined and
  forcing the source to be UTF-8.

- The methods `os.tmpnam()`, `os.tempnam()` and `os.tmpfile()` have
  been removed in favor of the tempfile module.

- Removed the 'new' module.

- Removed all types from the 'types' module that are easily accessable
  through builtins.


What's New in Python 3.0a1?
==========================

*Release date: 31-Aug-2007*

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

- PEP 3131: Support non-ASCII identifiers.

- PEP 3120: Change default encoding to UTF-8.

- PEP 3123: Use proper C inheritance for PyObject.

- Removed the __oct__ and __hex__ special methods and added a bin()
  builtin function.

- PEP 3127: octal literals now start with "0o". Old-style octal
  literals are invalid. There are binary literals with a prefix of
  "0b".  This also affects int(x, 0).

- None, True, False are now keywords.

- PEP 3119: isinstance() and issubclass() can be overridden.

- Remove BaseException.message.

- Remove tuple parameter unpacking (PEP 3113).

- Remove the f_restricted attribute from frames.  This naturally leads
  to the removal of PyEval_GetRestricted() and PyFrame_IsRestricted().

- PEP 3132 was accepted. That means that you can do ``a, *b =
  range(5)`` to assign 0 to a and [1, 2, 3, 4] to b.

- range() now returns an iterator rather than a list.  Floats are not
  allowed.  xrange() is no longer defined.

- Patch #1660500: hide iteration variable in list comps, add set comps
  and use common code to handle compilation of iterative expressions.

- By default, != returns the opposite of ==, unless the latter returns
  NotImplemented.

- Patch #1680961: sys.exitfunc has been removed and replaced with a
  private C-level API.

- PEP 3115: new metaclasses: the metaclass is now specified as a
  keyword arg in the class statement, which can now use the full
  syntax of a parameter list. Also, the metaclass can implement a
  __prepare__ function which will be called to create the dictionary
  for the new class namespace.

- The long-deprecated argument "pend" of PyFloat_FromString() has been
  removed.

- The dir() function has been extended to call the __dir__() method on
  its argument, if it exists. If not, it will work like before. This
  allows customizing the output of dir() in the presence of a
  __getattr__().

- Removed support for __members__ and __methods__.

- Removed indexing/slicing on BaseException.

- input() became raw_input(): the name input() now implements the
  functionality formerly known as raw_input(); the name raw_input() is
  no longer defined.

- Classes listed in an 'except' clause must inherit from
  BaseException.

- PEP 3106: dict.iterkeys(), .iteritems(), .itervalues() are now gone;
  and .keys(), .items(), .values() return dict views, which behave
  like sets.

- PEP 3105: print is now a function.  Also (not in the PEP) the
  'softspace' attribute of files is now gone (since print() doesn't
  use it).  A side effect of this change is that you can get
  incomplete output lines in interactive sessions:

  >>> print(42, end="")
  42>>>

  We may be able to fix this after the I/O library rewrite.

- PEP 3102: keyword-only arguments.

- Int/Long unification is complete.  The 'long' built-in type and
  literals with trailing 'L' or 'l' have been removed.  Performance
  may be sub-optimal (haven't really benchmarked).

- 'except E, V' must now be spelled as 'except E as V' and deletes V
  at the end of the except clause; V must be a simple name.

- Added function annotations per PEP 3107.

- Added nonlocal declaration from PEP 3104:

  >>> def f(x):
  ...     def inc():
  ...         nonlocal x
  ...         x += 1
  ...         return x
  ...     return inc
  ...
  >>> inc = f(0)
  >>> inc()
  1
  >>> inc()
  2

- Moved intern() to sys.intern().

- exec is now a function.

- Renamed nb_nonzero to nb_bool and __nonzero__ to __bool__.

- Classic classes are a thing of the past.  All classes are new style.

- Exceptions *must* derive from BaseException.

- Integer division always returns a float.  The -Q option is no more.
  All the following are gone:
   * PyNumber_Divide and PyNumber_InPlaceDivide
   * __div__, __rdiv__, and __idiv__
   * nb_divide, nb_inplace_divide
   * operator.div, operator.idiv, operator.__div__, operator.__idiv__
  (Only __truediv__ and __floordiv__ remain, not sure how to handle them
   if we want to re-use __div__ and friends.  If we do, it will make
   it harder to write code for both 2.x and 3.x.)

- 'as' and 'with' are keywords.

- Absolute import is the default behavior for 'import foo' etc.

- Removed support for syntax: backticks (ie, `x`), <>.

- Removed these Python builtins: apply(), callable(), coerce(),
  execfile(), file(), reduce(), reload().

- Removed these Python methods: {}.has_key.

- Removed these opcodes: BINARY_DIVIDE, INPLACE_DIVIDE, UNARY_CONVERT.

- Remove C API support for restricted execution.

- zip(), map() and filter() now return iterators, behaving like their
  itertools counterparts.  This also affect map()'s behavior on
  sequences of unequal length -- it now stops after the shortest one
  is exhausted.

- Additions: set literals, set comprehensions, ellipsis literal.

- Added class decorators per PEP 3129.


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

- Removed the imageop module.  Obsolete long with its unit tests
  becoming useless from the removal of rgbimg and imgfile.

- Removed these attributes from the operator module: div, idiv,
  __div__, __idiv__, isCallable, sequenceIncludes.

- Removed these attributes from the sys module: exc_clear(), exc_type,
  exc_value, exc_traceback.


Library
-------

- Removed the compiler package.  Use of the _ast module and (an
  eventual) AST -> bytecode mechanism.

- Removed these modules: audiodev, Bastion, bsddb185, exceptions,
  linuxaudiodev, md5, MimeWriter, mimify, popen2, rexec, sets, sha,
  stringold, strop, sunaudiodev, timing, xmllib.

- Moved the toaiff module to Tools/Demos.

- Removed obsolete IRIX modules: al/AL, cd/CD, cddb, cdplayer, cl/CL,
  DEVICE, ERRNO, FILE, fl/FL, flp, fm, GET, gl/GL, GLWS, IN, imgfile,
  IOCTL, jpeg, panel, panelparser, readcd, sgi, sv/SV, torgb, WAIT.

- Removed obsolete functions: commands.getstatus(), os.popen*().

- Removed functions in the string module that are also string methods;
  Remove string.{letters, lowercase, uppercase}.

- Removed support for long obsolete platforms: plat-aix3, plat-irix5.

- Removed xmlrpclib.SlowParser.  It was based on xmllib.

- Patch #1680961: atexit has been reimplemented in C.

- Add new codecs for UTF-32, UTF-32-LE and UTF-32-BE.

Build
-----

C API
-----

- Removed these Python slots: __coerce__, __div__, __idiv__, __rdiv__.

- Removed these C APIs: PyNumber_Coerce(), PyNumber_CoerceEx(),
  PyMember_Get, PyMember_Set.

- Removed these C slots/fields: nb_divide, nb_inplace_divide.

- Removed these macros: staticforward, statichere, PyArg_GetInt,
  PyArg_NoArgs, _PyObject_Del.

- Removed these typedefs: intargfunc, intintargfunc, intobjargproc,
  intintobjargproc, getreadbufferproc, getwritebufferproc,
  getsegcountproc, getcharbufferproc, memberlist.

Tests
-----

- Removed test.testall as test.regrtest replaces it.

Documentation
-------------

Mac
---

- The cfmfile module was removed.

Platforms
---------

- Support for BeOS and AtheOS was removed (according to PEP 11).

- Support for RiscOS, Irix, Tru64 was removed (alledgedly).

Tools/Demos
-----------


**(For information about older versions, consult the HISTORY file.)**