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Skip Montanaroe5d7f7f2002-09-20 14:16:59 +00001+++++++++++
2Python News
3+++++++++++
4
Anthony Baxterb0c66302004-11-04 05:23:17 +00005(editors: check NEWS.help for information about editing NEWS using ReST.)
6
Brett Cannon0d71ee72008-05-08 18:13:40 +00007What's new in Python 3.0b1?
8===========================
9
10*Release date: XX-June-2008*
11
12Core and Builtins
13-----------------
14
Mark Dickinsonc4352b02008-05-09 13:55:01 +000015- Issue 2801: fix bug in the float.is_integer method where a ValueError
16 was sometimes incorrectly raised.
17
Brett Cannon0d71ee72008-05-08 18:13:40 +000018Extension Modules
19-----------------
20
21Library
22-------
23
Brett Cannoncf3520c2008-05-11 22:47:58 +000024- The sre module has been removed.
25
Alexandre Vassalottif260e442008-05-11 19:59:59 +000026- The Queue module has been renamed to queue.
27
Alexandre Vassalottif7fa63d2008-05-11 08:55:36 +000028- The copy_reg module has been renamed to copyreg.
29
Brett Cannond8b61ee2008-05-11 03:00:26 +000030- The mhlib module has been removed.
31
Brett Cannonbd474422008-05-10 22:42:14 +000032- The ihooks module has been removed.
33
Brett Cannonb59a2bd2008-05-10 22:03:16 +000034- The fpformat module has been removed.
35
Brett Cannonf4fd9932008-05-10 21:11:46 +000036- The dircache module has been removed.
37
Brett Cannond175b4c2008-05-10 03:19:54 +000038- The Canvas module has been removed.
39
Mark Dickinsonb27406c2008-05-09 13:42:33 +000040- The Decimal module gained the magic methods __round__, __ceil__,
41 __floor__ and __trunc__, to give support for round, math.ceil,
42 math.floor and math.trunc.
43
Brett Cannon900ee3a2008-05-08 20:31:11 +000044- The user module has been removed.
45
Brett Cannon34afe872008-05-08 20:31:44 +000046- The mutex module has been removed.
47
Brett Cannon0d71ee72008-05-08 18:13:40 +000048- The imputil module has been removed.
49
Benjamin Petersond71ca412008-05-08 23:44:58 +000050- os.path.walk has been removed in favor of os.walk
51
Brett Cannon0d71ee72008-05-08 18:13:40 +000052Build
53-----
54
55
Barry Warsaw66079cd2008-04-04 01:36:36 +000056What's New in Python 3.0a5?
57===========================
58
Barry Warsaw9eab8b02008-05-08 13:05:38 +000059*Release date: 08-May-2008*
Barry Warsaw66079cd2008-04-04 01:36:36 +000060
61Core and Builtins
62-----------------
63
Mark Dickinson7ab6be22008-04-15 21:42:42 +000064- Fix misbehaviour of PyLong_FromSsize_t on systems where sizeof(size_t) >
65 sizeof(long).
66
Amaury Forgeot d'Arc7fedbe52008-04-10 21:03:09 +000067- Issue #2221: Corrected a SystemError "error return without exception set",
68 when the code executed by exec() raises an exception, and sys.stdout.flush()
69 also raises an error.
70
Martin v. Löwis250ad612008-04-07 05:43:42 +000071- Bug #2565: The repr() of type objects now calls them 'class',
72 not 'type' - whether they are builtin types or not.
73
Martin v. Löwis790465f2008-04-05 20:41:37 +000074- The command line processing was converted to pass Unicode strings
75 through as unmodified as possible; as a consequence, the C API
76 related to command line arguments was changed to use wchar_t.
77
Benjamin Petersona2f837f2008-04-28 21:05:10 +000078- All backslashes in raw strings are interpreted literally. This means that
79 '\u' and '\U' escapes are not treated specially.
80
Barry Warsaw66079cd2008-04-04 01:36:36 +000081Extension Modules
82-----------------
83
84Library
85-------
86
Thomas Hellerb041fda2008-04-30 17:11:46 +000087- ctypes objects now support the PEP3118 buffer interface
88
Thomas Hellere106dc32008-04-24 18:39:36 +000089- Issue #2682: ctypes callback functions now longer contain a cyclic
90 reference to themselves.
91
Lars Gustäbelc2ea8c62008-04-14 10:05:48 +000092- Issue #2058: Remove the buf attribute and add __slots__ to the TarInfo
93 class in order to reduce tarfile's memory usage.
94
Martin v. Löwis8efc62c2008-04-10 19:02:25 +000095- Bug #2606: Avoid calling .sort() on a dict_keys object.
96
Thomas Hellerbff533b2008-04-04 19:53:14 +000097- The bundled libffi copy is now in sync with the recently released
98 libffi3.0.5 version, apart from some small changes to
99 Modules/_ctypes/libffi/configure.ac.
100
Thomas Hellerf44b9a12008-04-04 10:18:23 +0000101Build
102-----
103
Mark Dickinsonb0e2b4c2008-04-26 20:48:56 +0000104- Issue #1496032: On alpha, use -mieee when gcc is the compiler.
105
Guido van Rossumdc21db32008-04-07 18:37:41 +0000106- "make install" is now an alias for "make altinstall", to prevent
107 accidentally overwriting a Python 2.x installation.
108 Use "make fullinstall" to force Python 3.0 to be installed as
109 "python".
110
Thomas Hellerf44b9a12008-04-04 10:18:23 +0000111- Issue #2544: On HP-UX systems, use 'gcc -shared' for linking when
112 gcc is used as compiler.
Barry Warsaw66079cd2008-04-04 01:36:36 +0000113
Barry Warsawa9d499d2008-03-01 18:38:07 +0000114What's New in Python 3.0a4?
115===========================
116
Barry Warsawbb5cd082008-04-02 23:33:27 +0000117*Release date: 02-Apr-2008*
Barry Warsawa9d499d2008-03-01 18:38:07 +0000118
Martin v. Löwis25931462008-03-17 20:43:42 +0000119Core and Builtins
120-----------------
121
122- Bug #2301: Don't try decoding the source code into the original
123 encoding for syntax errors.
124
Martin v. Löwis92fab752008-03-08 10:40:41 +0000125Extension Modules
126-----------------
127
Neal Norwitz6cf49cf2008-03-24 06:22:57 +0000128- The dl module was removed, use the ctypes module instead.
129
Martin v. Löwis92fab752008-03-08 10:40:41 +0000130- Use wchar_t functions in _locale module.
Barry Warsawa9d499d2008-03-01 18:38:07 +0000131
Martin v. Löwis071ef772008-03-08 11:24:24 +0000132Library
133-------
134
Martin v. Löwis73a22f02008-03-22 00:35:10 +0000135- The class distutils.commands.build_py.build_py_2to3 can be used
136 as a build_py replacement to automatically run 2to3 on modules
137 that are going to be installed.
138
Guido van Rossumf4169812008-03-17 22:56:06 +0000139- A new pickle protocol (protocol 3) is added with explicit support
140 for bytes. This is the default protocol. It intentionally cannot
141 be unpickled by Python 2.x.
142
143- When a pickle written by Python 2.x contains an (8-bit) str
144 instance, this is now decoded to a (Unicode) str instance. The
145 encoding used to do this defaults to ASCII, but can be overridden
146 via two new keyword arguments to the Unpickler class. Previously
147 this would create bytes instances, which is usually wrong: str
148 instances are often used to pickle attribute names etc., and text is
149 more common than binary data anyway.
150
Martin v. Löwis071ef772008-03-08 11:24:24 +0000151- Default to ASCII as the locale.getpreferredencoding, if the POSIX
152 system doesn't support CODESET and LANG isn't set or doesn't
153 allow deduction of an encoding.
154
Gregory P. Smith425136b2008-03-17 20:45:21 +0000155- Issue #1202: zlib.crc32 and zlib.adler32 now return an unsigned value.
156
Trent Nelson428de652008-03-18 22:41:35 +0000157- Issue #719888: Updated tokenize to use a bytes API. generate_tokens has been
158 renamed tokenize and now works with bytes rather than strings. A new
159 detect_encoding function has been added for determining source file encoding
160 according to PEP-0263. Token sequences returned by tokenize always start
161 with an ENCODING token which specifies the encoding used to decode the file.
162 This token is used to encode the output of untokenize back to bytes.
Barry Warsawa9d499d2008-03-01 18:38:07 +0000163
Christian Heimesbc873412007-12-08 22:11:32 +0000164What's New in Python 3.0a3?
165===========================
166
Barry Warsaw659fc422008-03-01 17:45:23 +0000167*Release date: 29-Feb-2008*
Christian Heimesbc873412007-12-08 22:11:32 +0000168
169Core and Builtins
170-----------------
171
Ka-Ping Yeeddaa7062008-03-17 20:35:15 +0000172- Issue #2282: io.TextIOWrapper was not overriding seekable() from io.IOBase.
173
Benjamin Petersonec79aad2008-04-02 22:44:10 +0000174- Issue #2115: Important speedup in setting __slot__ attributes. Also
175 prevent a possible crash: an Abstract Base Class would try to access a slot
Christian Heimesa156e092008-02-16 07:38:31 +0000176 on a registered virtual subclass.
177
178- Fixed repr() and str() of complex numbers with infinity or nan as real or
179 imaginary part.
180
181- Clear all free list during a gc.collect() of the highest generation in order
182 to allow pymalloc to free more arenas. Python may give back memory to the
183 OS earlier.
184
185- Issue #2045: Fix an infinite recursion triggered when printing a subclass of
186 collections.defaultdict, if its default_factory is set to a bound method.
187
188- Fixed a minor memory leak in dictobject.c. The content of the free
189 list was not freed on interpreter shutdown.
190
191- Limit free list of method and builtin function objects to 256 entries
192 each.
193
194- Patch #1953: Added ``sys._compact_freelists()`` and the C API functions
195 ``PyInt_CompactFreeList`` and ``PyFloat_CompactFreeList``
196 to compact the internal free lists of pre-allocted ints and floats.
197
198- Bug #1983: Fixed return type of fork(), fork1() and forkpty() calls.
199 Python expected the return type int but the fork familie returns pi_t.
200
201- Issue #1678380: Fix a bug that identifies 0j and -0j when they appear
202 in the same code unit.
203
Raymond Hettinger65baa342008-02-07 00:41:02 +0000204- Issue #2025 : Add tuple.count() and tuple.index() methods to comply with
205 the collections.Sequence API.
206
Christian Heimesdfc12ed2008-01-31 15:16:38 +0000207- Fixed multiple reinitialization of the Python interpreter. The small int
208 list in longobject.c has caused a seg fault during the third finalization.
209
Christian Heimesc04dac02008-01-30 11:27:57 +0000210- Issue #1973: bytes.fromhex('') raises SystemError
211
Raymond Hettinger70b64fc2008-01-30 20:15:17 +0000212- Issue #1771: remove cmp parameter from sorted() and list.sort()
213
Christian Heimes7b876152008-01-30 09:51:48 +0000214- Issue #1969: split and rsplit in bytearray are inconsistent
215
Raymond Hettinger736c0ab2008-03-13 02:09:15 +0000216- map() and no longer accepts None for the first argument.
Raymond Hettinger1dfde1d2008-01-22 23:25:35 +0000217 Use zip() instead.
218
Facundo Batista2336bdd2008-01-19 19:12:01 +0000219- Issue #1769: Now int("- 1") is not allowed any more.
220
Christian Heimes386cd1e2008-01-15 02:01:20 +0000221- Object/longobject.c: long(float('nan')) raises an OverflowError instead
222 of returning 0.
223
Christian Heimes3b06e532008-01-07 20:12:44 +0000224- Issue #1762972: __file__ points to the source file instead of the pyc/pyo
225 file if the py file exists.
226
Guido van Rossumab078dd2008-01-06 00:09:11 +0000227- Issue #1393: object_richcompare() returns NotImplemented instead of
228 False if the objects aren't equal, to give the other side a chance.
229
Guido van Rossume239b002008-01-06 00:44:20 +0000230- Issue #1692: Interpreter was not displaying location of SyntaxError.
Kurt B. Kaiser43b15092008-01-05 04:32:22 +0000231
Amaury Forgeot d'Arcbccd63c2008-01-04 01:21:27 +0000232- Improve some exception messages when Windows fails to load an extension
233 module. Now we get for example '%1 is not a valid Win32 application' instead
234 of 'error code 193'. Also use Unicode strings to deal with non-English
235 locales.
236
Christian Heimesa3534a62007-12-11 19:56:40 +0000237- Issue #1587: Added instancemethod wrapper for PyCFunctions. The Python C API
238 has gained a new type *PyInstanceMethod_Type* and the functions
239 *PyInstanceMethod_Check(o)*, *PyInstanceMethod_New(func)* and
240 *PyInstanceMethod_Function(im)*.
241
Amaury Forgeot d'Arcad8dcd52007-12-10 23:58:35 +0000242- Constants gc.DEBUG_OBJECT and gc.DEBUG_INSTANCE have been removed from the
243 gc module; gc.DEBUG_COLLECTABLE or gc.DEBUG_UNCOLLECTABLE are now enough to
244 print the corresponding list of objects considered by the garbage collector.
245
Guido van Rossume239b002008-01-06 00:44:20 +0000246- Issue #1573: Improper use of the keyword-only syntax makes the parser crash.
Christian Heimesbc873412007-12-08 22:11:32 +0000247
Christian Heimes0ded5b52007-12-10 15:50:56 +0000248- Issue #1564: The set implementation should special-case PyUnicode instead
Guido van Rossume239b002008-01-06 00:44:20 +0000249 of PyString.
Christian Heimes0ded5b52007-12-10 15:50:56 +0000250
Guido van Rossumea6775b2008-02-21 20:16:31 +0000251- Patch #1031213: Decode source line in SyntaxErrors back to its
252 original source encoding.
Christian Heimes7131fd92008-02-19 14:21:46 +0000253
Christian Heimes09aaa882008-02-23 15:01:06 +0000254- inspect.getsource() includes the decorators again.
255
Guido van Rossumea6775b2008-02-21 20:16:31 +0000256- Bug #1713: posixpath.ismount() claims symlink to a mountpoint is a
257 mountpoint.
Christian Heimes7131fd92008-02-19 14:21:46 +0000258
Christian Heimes7131fd92008-02-19 14:21:46 +0000259- Fix utf-8-sig incremental decoder, which didn't recognise a BOM when the
Guido van Rossumea6775b2008-02-21 20:16:31 +0000260 first chunk fed to the decoder started with a BOM, but was longer than 3
261 bytes.
Christian Heimes7131fd92008-02-19 14:21:46 +0000262
Christian Heimes7131fd92008-02-19 14:21:46 +0000263
Christian Heimesbc873412007-12-08 22:11:32 +0000264Extension Modules
265-----------------
266
Raymond Hettinger736c0ab2008-03-13 02:09:15 +0000267- Code for itertools ifilter(), imap(), and izip() moved to bultins and
268 renamed to filter(), map(), and zip(). Also, renamed izip_longest()
269 to zip_longest() and ifilterfalse() to filterfalse().
270
Christian Heimes043d6f62008-01-07 17:19:16 +0000271- Issue #1762972: Readded the reload() function as imp.reload()
Guido van Rossumea6775b2008-02-21 20:16:31 +0000272
Christian Heimesa156e092008-02-16 07:38:31 +0000273- Bug #2111: mmap segfaults when trying to write a block opened with PROT_READ
274
275- #2063: correct order of utime and stime in os.times() result on Windows.
Christian Heimesbc873412007-12-08 22:11:32 +0000276
Christian Heimes7131fd92008-02-19 14:21:46 +0000277
Christian Heimesbc873412007-12-08 22:11:32 +0000278Library
279-------
280
Raymond Hettinger48b8b662008-02-05 01:53:00 +0000281- Weakref dictionaries now inherit from MutableMapping.
282 XXX their API still needs to be modernized (i.e. eliminate the iter methods).
283
284- Created new UserDict class in collections module. This one inherits from and
Raymond Hettingerb3a65f82008-02-21 22:11:37 +0000285 complies with the MutableMapping ABC. Also, moved UserString and UserList
286 to the collections module. The MutableUserString class was removed.
Raymond Hettinger48b8b662008-02-05 01:53:00 +0000287
Guido van Rossumea6775b2008-02-21 20:16:31 +0000288- Removed UserDict.DictMixin. Replaced all its uses with
289 collections.MutableMapping.
Raymond Hettingeredf3b732008-02-04 22:07:15 +0000290
Guido van Rossume239b002008-01-06 00:44:20 +0000291- Issue #1703: getpass() should flush after writing prompt.
Christian Heimesfc5aa9d2007-12-11 09:00:01 +0000292
Guido van Rossume239b002008-01-06 00:44:20 +0000293- Issue #1585: IDLE uses non-existent xrange() function.
294
295- Issue #1578: Problems in win_getpass.
296
Georg Brandl52d168a2008-01-07 18:10:24 +0000297Build
298-----
299
300- Renamed --enable-unicode configure flag to --with-wide-unicode, since
301 Unicode strings can't be disabled anymore.
302
303
Guido van Rossume239b002008-01-06 00:44:20 +0000304C API
305-----
306
307- Issue #1629: Renamed Py_Size, Py_Type and Py_Refcnt to Py_SIZE,
308 Py_TYPE and Py_REFCNT.
309
310- New API PyImport_ImportModuleNoBlock(), works like PyImport_ImportModule()
311 but won't block on the import lock (returning an error instead).
Christian Heimes0ec88b32007-12-10 17:02:00 +0000312
Christian Heimesbc873412007-12-08 22:11:32 +0000313
Fred Drake0e474a82007-10-11 18:01:43 +0000314What's New in Python 3.0a2?
Christian Heimesbc873412007-12-08 22:11:32 +0000315===========================
Fred Drake0e474a82007-10-11 18:01:43 +0000316
Guido van Rossum99533a92007-12-06 05:07:41 +0000317*Release date: 07-Dec-2007*
318
319(Note: this list is incomplete.)
Fred Drake0e474a82007-10-11 18:01:43 +0000320
Guido van Rossum40d20bc2007-10-22 00:09:51 +0000321Core and Builtins
322-----------------
323
Brett Cannon37f7e6e2007-10-26 05:42:09 +0000324- str8 now has the same construction signature as bytes.
325
Brett Cannon40430012007-10-22 20:24:51 +0000326- Comparisons between str and str8 now return False/True for ==/!=. sqlite3
327 returns str8 when recreating on object from it's __conform__ value. The
328 struct module returns str8 for all string-related formats. This was true
329 before this change, but becomes more apparent thanks to string comparisons
330 always being False.
331
Guido van Rossum40d20bc2007-10-22 00:09:51 +0000332- Replaced `PyFile_FromFile()` with `PyFile_FromFd(fd, name. mode, buffer,
333 encoding, newline)`
334
335- Fixed `imp.find_module()` to obey the -*- coding: -*- header.
336
337- Changed `__file__` and `co_filename` to unicode. The path names are decoded
338 with `Py_FileSystemDefaultEncoding` and a new API method
339 `PyUnicode_DecodeFSDefault(char*)` was added.
340
Guido van Rossum2dced8b2007-10-30 17:27:30 +0000341- io.open() and _fileio.FileIO have grown a new argument closefd. A false
342 value disables the closing of the file descriptor.
343
Guido van Rossum98297ee2007-11-06 21:34:58 +0000344- Added a new option -b to issues warnings (-bb for errors) about certain
345 operations between bytes/buffer and str like str(b'') and comparsion.
346
Christian Heimes58cb1b82007-11-13 02:19:40 +0000347- The standards streams sys.stdin, stdout and stderr may be None when the
348 when the C runtime library returns an invalid file descriptor for the
349 streams (fileno(stdin) < 0). For now this happens only for Windows GUI
350 apps and scripts started with `pythonw.exe`.
351
Christian Heimesbce52be2007-11-17 19:08:41 +0000352- Added PCbuild9 directory for VS 2008.
353
354- Renamed structmember.h WRITE_RESTRICTED to PY_WRITE_RESTRICTED to work
355 around a name clash with VS 2008 on Windows.
356
Christian Heimesff737952007-11-27 10:40:20 +0000357- Unbound methods are gone for good. ClassObject.method returns an ordinary
358 function object, instance.method still returns a bound method object.
359 The API of bound methods is cleaned up, too. The im_class attribute is
360 removed and im_func + im_self are renamed to __func__ and __self__. The
361 factory PyMethod_New takes only func and instance as argument.
362
Christian Heimesf78b1c62007-12-02 16:52:32 +0000363- intobject.h is no longer included by Python.h. The remains were moved
364 to longobject.h. It still exists to define several aliases from PyInt_
365 to PyLong_ functions.
366
Christian Heimesa37d4c62007-12-04 23:02:19 +0000367- Removed sys.maxint, use sys.maxsize instead.
368
Christian Heimesbce52be2007-11-17 19:08:41 +0000369
Fred Drake0e474a82007-10-11 18:01:43 +0000370Extension Modules
371-----------------
372
373- The `hotshot` profiler has been removed; use `cProfile` instead.
374
375
Brett Cannone9fd2312007-10-12 19:18:19 +0000376Library
377-------
378
379- When loading an external file using testfile(), the passed-in encoding
380 argument was being ignored if __loader__ is defined and forcing the source to
381 be UTF-8.
382
Guido van Rossum687b9c02007-10-25 23:18:51 +0000383- The methods `os.tmpnam()`, `os.tempnam()` and `os.tmpfile()` have been
384 removed in favor of the tempfile module.
385
Christian Heimesc9543e42007-11-28 08:28:28 +0000386- Removed the 'new' module.
387
388- Removed all types from the 'types' module that are easily accessable through
389 builtins.
Brett Cannone9fd2312007-10-12 19:18:19 +0000390
Georg Brandl52d168a2008-01-07 18:10:24 +0000391
Guido van Rossum4405cf32007-08-30 17:16:55 +0000392What's New in Python 3.0a1?
Guido van Rossum45aecf42006-03-15 04:58:47 +0000393==========================
Thomas Wouters4d70c3d2006-06-08 14:42:34 +0000394
Guido van Rossum4405cf32007-08-30 17:16:55 +0000395*Release date: 31-Aug-2007*
Neal Norwitz4886cc32006-08-21 17:06:07 +0000396
397Core and Builtins
398-----------------
399
Martin v. Löwis47383402007-08-15 07:32:56 +0000400- PEP 3131: Support non-ASCII identifiers.
401
Martin v. Löwis447d33e2007-07-29 18:10:01 +0000402- PEP 3120: Change default encoding to UTF-8.
403
Martin v. Löwis9f2e3462007-07-21 17:22:18 +0000404- PEP 3123: Use proper C inheritance for PyObject.
405
Guido van Rossumcd16bf62007-06-13 18:07:49 +0000406- Removed the __oct__ and __hex__ special methods and added a bin()
407 builtin function.
408
409- PEP 3127: octal literals now start with "0o". Old-style octal literals
410 are invalid. There are binary literals with a prefix of "0b".
411 This also affects int(x, 0).
412
Guido van Rossume7ba4952007-06-06 23:52:48 +0000413- None, True, False are now keywords.
414
Guido van Rossum29478ef2007-05-29 00:39:44 +0000415- PEP 3119: isinstance() and issubclass() can be overridden.
416
Guido van Rossumebe3e162007-05-17 18:20:34 +0000417- Remove BaseException.message.
418
Guido van Rossum1bc535d2007-05-15 18:46:22 +0000419- Remove tuple parameter unpacking (PEP 3113).
420
Kurt B. Kaiser2c7f3142007-08-30 21:52:19 +0000421- Remove the f_restricted attribute from frames. This naturally leads to the
Guido van Rossuma8add0e2007-05-14 22:03:55 +0000422 removal of PyEval_GetRestricted() and PyFrame_IsRestricted().
423
Guido van Rossum0368b722007-05-11 16:50:42 +0000424- PEP 3132 was accepted. That means that you can do ``a, *b = range(5)``
425 to assign 0 to a and [1, 2, 3, 4] to b.
426
Guido van Rossum805365e2007-05-07 22:24:25 +0000427- range() now returns an iterator rather than a list. Floats are not allowed.
428 xrange() is no longer defined.
429
Nick Coghlan650f0d02007-04-15 12:05:43 +0000430- Patch #1660500: hide iteration variable in list comps, add set comps
431 and use common code to handle compilation of iterative expressions
432
Guido van Rossume27dc722007-03-27 22:37:34 +0000433- By default, != returns the opposite of ==, unless the latter returns
434 NotImplemented.
435
Collin Winter670e6922007-03-21 02:57:17 +0000436- Patch #1680961: sys.exitfunc has been removed and replaced with a private
437 C-level API.
438
Georg Brandl801dd732007-03-18 20:18:31 +0000439- PEP 3115: new metaclasses: the metaclass is now specified as a
440 keyword arg in the class statement, which can now use the full syntax of
441 a parameter list. Also, the metaclass can implement a __prepare__ function
442 which will be called to create the dictionary for the new class namespace.
443
Georg Brandl428f0642007-03-18 18:35:15 +0000444- The long-deprecated argument "pend" of PyFloat_FromString() has been
445 removed.
446
Georg Brandle32b4222007-03-10 22:13:27 +0000447- The dir() function has been extended to call the __dir__() method on
448 its argument, if it exists. If not, it will work like before. This allows
449 customizing the output of dir() in the presence of a __getattr__().
Brett Cannonba7bf492007-02-27 00:15:55 +0000450
Neal Norwitz8dfc4a92007-08-11 06:39:53 +0000451- Removed support for __members__ and __methods__.
452
Georg Brandle32b4222007-03-10 22:13:27 +0000453- Removed indexing/slicing on BaseException.
Neal Norwitz2633c692007-02-26 22:22:47 +0000454
Georg Brandle32b4222007-03-10 22:13:27 +0000455- input() became raw_input(): the name input() now implements the
Guido van Rossum0240b922007-02-26 21:23:50 +0000456 functionality formerly known as raw_input(); the name raw_input()
457 is no longer defined.
458
Brett Cannon39590462007-02-26 22:01:14 +0000459- Classes listed in an 'except' clause must inherit from BaseException.
Brett Cannonf74225d2007-02-26 21:10:16 +0000460
Guido van Rossumcc2b0162007-02-11 06:12:03 +0000461- PEP 3106: dict.iterkeys(), .iteritems(), .itervalues() are now gone;
Guido van Rossumcf1be882007-08-30 22:07:17 +0000462 and .keys(), .items(), .values() return dict views, which behave
463 like sets.
Guido van Rossumcc2b0162007-02-11 06:12:03 +0000464
Guido van Rossum8b545362007-02-09 23:52:14 +0000465- PEP 3105: print is now a function. Also (not in the PEP) the
466 'softspace' attribute of files is now gone (since print() doesn't use
467 it). A side effect of this change is that you can get incomplete
468 output lines in interactive sessions:
469
470 >>> print(42, end="")
Kurt B. Kaiser2c7f3142007-08-30 21:52:19 +0000471 42>>>
Guido van Rossum8b545362007-02-09 23:52:14 +0000472
473 We may be able to fix this after the I/O library rewrite.
Guido van Rossum4502c802007-02-09 05:42:38 +0000474
Brett Cannon398db8b2007-01-29 23:44:37 +0000475- PEP 3102: keyword-only arguments.
476
Guido van Rossumd4588c12007-02-13 19:55:23 +0000477- Int/Long unification is complete. The 'long' built-in type
Guido van Rossumec7027f2007-01-30 00:00:40 +0000478 and literals with trailing 'L' or 'l' have been removed.
479 Performance may be sub-optimal (haven't really benchmarked).
Guido van Rossumab186842007-01-14 03:42:30 +0000480
481- 'except E, V' must now be spelled as 'except E as V' and deletes V
482 at the end of the except clause; V must be a simple name.
483
Neal Norwitzc1505362006-12-28 06:47:50 +0000484- Added function annotations per PEP 3107.
485
Jeremy Hyltona4f9fc62007-02-27 15:53:28 +0000486- Added nonlocal declaration from PEP 3104
487
488 >>> def f(x):
489 ... def inc():
490 ... nonlocal x
491 ... x += 1
492 ... return x
493 ... return inc
494 ...
495 >>> inc = f(0)
496 >>> inc()
497 1
498 >>> inc()
499 2
500
Georg Brandl66a796e2006-12-19 20:50:34 +0000501- Moved intern() to sys.intern().
502
503- exec is now a function.
504
505- Renamed nb_nonzero to nb_bool and __nonzero__ to __bool__.
Jack Diederich4dafcc42006-11-28 19:15:13 +0000506
Neal Norwitz4886cc32006-08-21 17:06:07 +0000507- Classic classes are a thing of the past. All classes are new style.
508
509- Exceptions *must* derive from BaseException.
510
511- Integer division always returns a float. The -Q option is no more.
512 All the following are gone:
513 * PyNumber_Divide and PyNumber_InPlaceDivide
514 * __div__, __rdiv__, and __idiv__
515 * nb_divide, nb_inplace_divide
516 * operator.div, operator.idiv, operator.__div__, operator.__idiv__
517 (Only __truediv__ and __floordiv__ remain, not sure how to handle them
518 if we want to re-use __div__ and friends. If we do, it will make
519 it harder to write code for both 2.x and 3.x.)
520
521- 'as' and 'with' are keywords.
522
523- Absolute import is the default behavior for 'import foo' etc.
524
Neal Norwitz378b2c92006-08-29 07:57:22 +0000525- Removed support for syntax:
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000526 backticks (ie, `x`), <>
Neal Norwitz378b2c92006-08-29 07:57:22 +0000527
Neal Norwitz4886cc32006-08-21 17:06:07 +0000528- Removed these Python builtins:
Neal Norwitz01688022007-08-12 00:43:29 +0000529 apply(), callable(), coerce(), execfile(), file(), reduce(), reload()
Neal Norwitz4886cc32006-08-21 17:06:07 +0000530
Neal Norwitz378b2c92006-08-29 07:57:22 +0000531- Removed these Python methods:
532 {}.has_key
533
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000534- Removed these opcodes:
535 BINARY_DIVIDE, INPLACE_DIVIDE, UNARY_CONVERT
536
537- Remove C API support for restricted execution.
538
Guido van Rossumcf1be882007-08-30 22:07:17 +0000539- zip(), map() and filter() now return iterators, behaving like their
540 itertools counterparts. This also affect map()'s behavior on
541 sequences of unequal length -- it now stops after the shortest one
542 is exhausted.
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000543
544- Additions:
Guido van Rossumcf1be882007-08-30 22:07:17 +0000545 set literals, set comprehensions, ellipsis literal.
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000546
547- Added class decorators per PEP 3129.
548
549
550Extension Modules
551-----------------
552
553- Remove the imageop module. Obsolete long with its unit tests becoming
554 useless from the removal of rgbimg and imgfile.
Neal Norwitz4886cc32006-08-21 17:06:07 +0000555
556- Removed these attributes from Python modules:
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000557 * operator module: div, idiv, __div__, __idiv__, isCallable, sequenceIncludes
Guido van Rossume7ba4952007-06-06 23:52:48 +0000558 * sys module: exc_clear(), exc_type, exc_value, exc_traceback
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000559
560
561Library
562-------
563
564- Remove the compiler package. Use of the _ast module and (an eventual)
565 AST -> bytecode mechanism.
566
567- Removed these modules:
Guido van Rossum33d26892007-08-05 15:29:28 +0000568 * audiodev, Bastion, bsddb185, exceptions, linuxaudiodev,
569 md5, MimeWriter, mimify, popen2,
570 rexec, sets, sha, stringold, strop, sunaudiodev, timing, xmllib.
571
572- Moved these modules to Tools/Demos:
573 * toaiff
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000574
575- Remove obsolete IRIX modules: al/AL, cd/CD, cddb, cdplayer, cl/CL, DEVICE,
576 ERRNO, FILE, fl/FL, flp, fm, GET, gl/GL, GLWS, IN, imgfile, IOCTL, jpeg,
577 panel, panelparser, readcd, sgi, sv/SV, torgb, WAIT.
578
579- Remove obsolete functions:
580 * commands.getstatus(), os.popen*,
581
Martin v. Löwis967f1e32007-08-14 09:23:10 +0000582- Remove functions in the string module that are also string methods;
583 Remove string.{letters, lowercase, uppercase}.
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000584
585- Remove support for long obsolete platforms: plat-aix3, plat-irix5.
586
587- Remove xmlrpclib.SlowParser. It was based on xmllib.
588
589- Patch #1680961: atexit has been reimplemented in C.
590
Walter Dörwald41980ca2007-08-16 21:55:45 +0000591- Add new codecs for UTF-32, UTF-32-LE and UTF-32-BE.
592
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000593
594Build
595-----
596
597C API
598-----
599
600- Removed these Python slots:
601 __coerce__, __div__, __idiv__, __rdiv__
Neal Norwitz4886cc32006-08-21 17:06:07 +0000602
Neal Norwitz4886cc32006-08-21 17:06:07 +0000603- Removed these C APIs:
Neal Norwitz8dfc4a92007-08-11 06:39:53 +0000604 PyNumber_Coerce(), PyNumber_CoerceEx(), PyMember_Get, PyMember_Set
Neal Norwitz4886cc32006-08-21 17:06:07 +0000605
606- Removed these C slots/fields:
607 nb_divide, nb_inplace_divide
608
609- Removed these macros:
Neal Norwitz30d1c512007-08-19 22:48:23 +0000610 staticforward, statichere, PyArg_GetInt, PyArg_NoArgs, _PyObject_Del
Neal Norwitz4886cc32006-08-21 17:06:07 +0000611
612- Removed these typedefs:
613 intargfunc, intintargfunc, intobjargproc, intintobjargproc,
Neal Norwitz8dfc4a92007-08-11 06:39:53 +0000614 getreadbufferproc, getwritebufferproc, getsegcountproc, getcharbufferproc,
615 memberlist
Neal Norwitz4886cc32006-08-21 17:06:07 +0000616
Raymond Hettinger4901a1f2004-12-02 08:59:14 +0000617
Raymond Hettinger4901a1f2004-12-02 08:59:14 +0000618Tests
619-----
620
Brett Cannone7a30f72008-03-03 03:36:27 +0000621- Removed test.testall as test.regrtest replaces it.
622
623
Brett Cannonced04e02005-02-13 22:53:22 +0000624Documentation
625-------------
626
Raymond Hettinger4901a1f2004-12-02 08:59:14 +0000627Mac
628---
629
Guido van Rossume7ba4952007-06-06 23:52:48 +0000630- The cfmfile was removed.
631
632
Guido van Rossum845702c2007-08-30 18:44:53 +0000633Platforms
634---------
635
636- Support for BeOS and AtheOS was removed (according to PEP 11).
637
638- Support for RiscOS, Irix, Tru64 was removed (alledgedly).
639
Hye-Shik Chang4e422812005-07-17 02:36:59 +0000640
Raymond Hettinger4901a1f2004-12-02 08:59:14 +0000641Tools/Demos
642-----------
643
Skip Montanaroe5d7f7f2002-09-20 14:16:59 +0000644**(For information about older versions, consult the HISTORY file.)**