blob: 4cf93533ab871920ba1695844f8ad27851f71000 [file] [log] [blame]
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
15Extension Modules
16-----------------
17
18Library
19-------
20
Brett Cannon900ee3a2008-05-08 20:31:11 +000021- The user module has been removed.
22
Brett Cannon0d71ee72008-05-08 18:13:40 +000023- The imputil module has been removed.
24
25Build
26-----
27
28
Barry Warsaw66079cd2008-04-04 01:36:36 +000029What's New in Python 3.0a5?
30===========================
31
Barry Warsaw9eab8b02008-05-08 13:05:38 +000032*Release date: 08-May-2008*
Barry Warsaw66079cd2008-04-04 01:36:36 +000033
34Core and Builtins
35-----------------
36
Mark Dickinson7ab6be22008-04-15 21:42:42 +000037- Fix misbehaviour of PyLong_FromSsize_t on systems where sizeof(size_t) >
38 sizeof(long).
39
Amaury Forgeot d'Arc7fedbe52008-04-10 21:03:09 +000040- Issue #2221: Corrected a SystemError "error return without exception set",
41 when the code executed by exec() raises an exception, and sys.stdout.flush()
42 also raises an error.
43
Martin v. Löwis250ad612008-04-07 05:43:42 +000044- Bug #2565: The repr() of type objects now calls them 'class',
45 not 'type' - whether they are builtin types or not.
46
Martin v. Löwis790465f2008-04-05 20:41:37 +000047- The command line processing was converted to pass Unicode strings
48 through as unmodified as possible; as a consequence, the C API
49 related to command line arguments was changed to use wchar_t.
50
Benjamin Petersona2f837f2008-04-28 21:05:10 +000051- All backslashes in raw strings are interpreted literally. This means that
52 '\u' and '\U' escapes are not treated specially.
53
Barry Warsaw66079cd2008-04-04 01:36:36 +000054Extension Modules
55-----------------
56
57Library
58-------
59
Thomas Hellerb041fda2008-04-30 17:11:46 +000060- ctypes objects now support the PEP3118 buffer interface
61
Thomas Hellere106dc32008-04-24 18:39:36 +000062- Issue #2682: ctypes callback functions now longer contain a cyclic
63 reference to themselves.
64
Lars Gustäbelc2ea8c62008-04-14 10:05:48 +000065- Issue #2058: Remove the buf attribute and add __slots__ to the TarInfo
66 class in order to reduce tarfile's memory usage.
67
Martin v. Löwis8efc62c2008-04-10 19:02:25 +000068- Bug #2606: Avoid calling .sort() on a dict_keys object.
69
Thomas Hellerbff533b2008-04-04 19:53:14 +000070- The bundled libffi copy is now in sync with the recently released
71 libffi3.0.5 version, apart from some small changes to
72 Modules/_ctypes/libffi/configure.ac.
73
Thomas Hellerf44b9a12008-04-04 10:18:23 +000074Build
75-----
76
Mark Dickinsonb0e2b4c2008-04-26 20:48:56 +000077- Issue #1496032: On alpha, use -mieee when gcc is the compiler.
78
Guido van Rossumdc21db32008-04-07 18:37:41 +000079- "make install" is now an alias for "make altinstall", to prevent
80 accidentally overwriting a Python 2.x installation.
81 Use "make fullinstall" to force Python 3.0 to be installed as
82 "python".
83
Thomas Hellerf44b9a12008-04-04 10:18:23 +000084- Issue #2544: On HP-UX systems, use 'gcc -shared' for linking when
85 gcc is used as compiler.
Barry Warsaw66079cd2008-04-04 01:36:36 +000086
Barry Warsawa9d499d2008-03-01 18:38:07 +000087What's New in Python 3.0a4?
88===========================
89
Barry Warsawbb5cd082008-04-02 23:33:27 +000090*Release date: 02-Apr-2008*
Barry Warsawa9d499d2008-03-01 18:38:07 +000091
Martin v. Löwis25931462008-03-17 20:43:42 +000092Core and Builtins
93-----------------
94
95- Bug #2301: Don't try decoding the source code into the original
96 encoding for syntax errors.
97
Martin v. Löwis92fab752008-03-08 10:40:41 +000098Extension Modules
99-----------------
100
Neal Norwitz6cf49cf2008-03-24 06:22:57 +0000101- The dl module was removed, use the ctypes module instead.
102
Martin v. Löwis92fab752008-03-08 10:40:41 +0000103- Use wchar_t functions in _locale module.
Barry Warsawa9d499d2008-03-01 18:38:07 +0000104
Martin v. Löwis071ef772008-03-08 11:24:24 +0000105Library
106-------
107
Martin v. Löwis73a22f02008-03-22 00:35:10 +0000108- The class distutils.commands.build_py.build_py_2to3 can be used
109 as a build_py replacement to automatically run 2to3 on modules
110 that are going to be installed.
111
Guido van Rossumf4169812008-03-17 22:56:06 +0000112- A new pickle protocol (protocol 3) is added with explicit support
113 for bytes. This is the default protocol. It intentionally cannot
114 be unpickled by Python 2.x.
115
116- When a pickle written by Python 2.x contains an (8-bit) str
117 instance, this is now decoded to a (Unicode) str instance. The
118 encoding used to do this defaults to ASCII, but can be overridden
119 via two new keyword arguments to the Unpickler class. Previously
120 this would create bytes instances, which is usually wrong: str
121 instances are often used to pickle attribute names etc., and text is
122 more common than binary data anyway.
123
Martin v. Löwis071ef772008-03-08 11:24:24 +0000124- Default to ASCII as the locale.getpreferredencoding, if the POSIX
125 system doesn't support CODESET and LANG isn't set or doesn't
126 allow deduction of an encoding.
127
Gregory P. Smith425136b2008-03-17 20:45:21 +0000128- Issue #1202: zlib.crc32 and zlib.adler32 now return an unsigned value.
129
Trent Nelson428de652008-03-18 22:41:35 +0000130- Issue #719888: Updated tokenize to use a bytes API. generate_tokens has been
131 renamed tokenize and now works with bytes rather than strings. A new
132 detect_encoding function has been added for determining source file encoding
133 according to PEP-0263. Token sequences returned by tokenize always start
134 with an ENCODING token which specifies the encoding used to decode the file.
135 This token is used to encode the output of untokenize back to bytes.
Barry Warsawa9d499d2008-03-01 18:38:07 +0000136
Christian Heimesbc873412007-12-08 22:11:32 +0000137What's New in Python 3.0a3?
138===========================
139
Barry Warsaw659fc422008-03-01 17:45:23 +0000140*Release date: 29-Feb-2008*
Christian Heimesbc873412007-12-08 22:11:32 +0000141
142Core and Builtins
143-----------------
144
Ka-Ping Yeeddaa7062008-03-17 20:35:15 +0000145- Issue #2282: io.TextIOWrapper was not overriding seekable() from io.IOBase.
146
Benjamin Petersonec79aad2008-04-02 22:44:10 +0000147- Issue #2115: Important speedup in setting __slot__ attributes. Also
148 prevent a possible crash: an Abstract Base Class would try to access a slot
Christian Heimesa156e092008-02-16 07:38:31 +0000149 on a registered virtual subclass.
150
151- Fixed repr() and str() of complex numbers with infinity or nan as real or
152 imaginary part.
153
154- Clear all free list during a gc.collect() of the highest generation in order
155 to allow pymalloc to free more arenas. Python may give back memory to the
156 OS earlier.
157
158- Issue #2045: Fix an infinite recursion triggered when printing a subclass of
159 collections.defaultdict, if its default_factory is set to a bound method.
160
161- Fixed a minor memory leak in dictobject.c. The content of the free
162 list was not freed on interpreter shutdown.
163
164- Limit free list of method and builtin function objects to 256 entries
165 each.
166
167- Patch #1953: Added ``sys._compact_freelists()`` and the C API functions
168 ``PyInt_CompactFreeList`` and ``PyFloat_CompactFreeList``
169 to compact the internal free lists of pre-allocted ints and floats.
170
171- Bug #1983: Fixed return type of fork(), fork1() and forkpty() calls.
172 Python expected the return type int but the fork familie returns pi_t.
173
174- Issue #1678380: Fix a bug that identifies 0j and -0j when they appear
175 in the same code unit.
176
Raymond Hettinger65baa342008-02-07 00:41:02 +0000177- Issue #2025 : Add tuple.count() and tuple.index() methods to comply with
178 the collections.Sequence API.
179
Christian Heimesdfc12ed2008-01-31 15:16:38 +0000180- Fixed multiple reinitialization of the Python interpreter. The small int
181 list in longobject.c has caused a seg fault during the third finalization.
182
Christian Heimesc04dac02008-01-30 11:27:57 +0000183- Issue #1973: bytes.fromhex('') raises SystemError
184
Raymond Hettinger70b64fc2008-01-30 20:15:17 +0000185- Issue #1771: remove cmp parameter from sorted() and list.sort()
186
Christian Heimes7b876152008-01-30 09:51:48 +0000187- Issue #1969: split and rsplit in bytearray are inconsistent
188
Raymond Hettinger736c0ab2008-03-13 02:09:15 +0000189- map() and no longer accepts None for the first argument.
Raymond Hettinger1dfde1d2008-01-22 23:25:35 +0000190 Use zip() instead.
191
Facundo Batista2336bdd2008-01-19 19:12:01 +0000192- Issue #1769: Now int("- 1") is not allowed any more.
193
Christian Heimes386cd1e2008-01-15 02:01:20 +0000194- Object/longobject.c: long(float('nan')) raises an OverflowError instead
195 of returning 0.
196
Christian Heimes3b06e532008-01-07 20:12:44 +0000197- Issue #1762972: __file__ points to the source file instead of the pyc/pyo
198 file if the py file exists.
199
Guido van Rossumab078dd2008-01-06 00:09:11 +0000200- Issue #1393: object_richcompare() returns NotImplemented instead of
201 False if the objects aren't equal, to give the other side a chance.
202
Guido van Rossume239b002008-01-06 00:44:20 +0000203- Issue #1692: Interpreter was not displaying location of SyntaxError.
Kurt B. Kaiser43b15092008-01-05 04:32:22 +0000204
Amaury Forgeot d'Arcbccd63c2008-01-04 01:21:27 +0000205- Improve some exception messages when Windows fails to load an extension
206 module. Now we get for example '%1 is not a valid Win32 application' instead
207 of 'error code 193'. Also use Unicode strings to deal with non-English
208 locales.
209
Christian Heimesa3534a62007-12-11 19:56:40 +0000210- Issue #1587: Added instancemethod wrapper for PyCFunctions. The Python C API
211 has gained a new type *PyInstanceMethod_Type* and the functions
212 *PyInstanceMethod_Check(o)*, *PyInstanceMethod_New(func)* and
213 *PyInstanceMethod_Function(im)*.
214
Amaury Forgeot d'Arcad8dcd52007-12-10 23:58:35 +0000215- Constants gc.DEBUG_OBJECT and gc.DEBUG_INSTANCE have been removed from the
216 gc module; gc.DEBUG_COLLECTABLE or gc.DEBUG_UNCOLLECTABLE are now enough to
217 print the corresponding list of objects considered by the garbage collector.
218
Guido van Rossume239b002008-01-06 00:44:20 +0000219- Issue #1573: Improper use of the keyword-only syntax makes the parser crash.
Christian Heimesbc873412007-12-08 22:11:32 +0000220
Christian Heimes0ded5b52007-12-10 15:50:56 +0000221- Issue #1564: The set implementation should special-case PyUnicode instead
Guido van Rossume239b002008-01-06 00:44:20 +0000222 of PyString.
Christian Heimes0ded5b52007-12-10 15:50:56 +0000223
Guido van Rossumea6775b2008-02-21 20:16:31 +0000224- Patch #1031213: Decode source line in SyntaxErrors back to its
225 original source encoding.
Christian Heimes7131fd92008-02-19 14:21:46 +0000226
Christian Heimes09aaa882008-02-23 15:01:06 +0000227- inspect.getsource() includes the decorators again.
228
Guido van Rossumea6775b2008-02-21 20:16:31 +0000229- Bug #1713: posixpath.ismount() claims symlink to a mountpoint is a
230 mountpoint.
Christian Heimes7131fd92008-02-19 14:21:46 +0000231
Christian Heimes7131fd92008-02-19 14:21:46 +0000232- Fix utf-8-sig incremental decoder, which didn't recognise a BOM when the
Guido van Rossumea6775b2008-02-21 20:16:31 +0000233 first chunk fed to the decoder started with a BOM, but was longer than 3
234 bytes.
Christian Heimes7131fd92008-02-19 14:21:46 +0000235
Christian Heimes7131fd92008-02-19 14:21:46 +0000236
Christian Heimesbc873412007-12-08 22:11:32 +0000237Extension Modules
238-----------------
239
Raymond Hettinger736c0ab2008-03-13 02:09:15 +0000240- Code for itertools ifilter(), imap(), and izip() moved to bultins and
241 renamed to filter(), map(), and zip(). Also, renamed izip_longest()
242 to zip_longest() and ifilterfalse() to filterfalse().
243
Christian Heimes043d6f62008-01-07 17:19:16 +0000244- Issue #1762972: Readded the reload() function as imp.reload()
Guido van Rossumea6775b2008-02-21 20:16:31 +0000245
Christian Heimesa156e092008-02-16 07:38:31 +0000246- Bug #2111: mmap segfaults when trying to write a block opened with PROT_READ
247
248- #2063: correct order of utime and stime in os.times() result on Windows.
Christian Heimesbc873412007-12-08 22:11:32 +0000249
Christian Heimes7131fd92008-02-19 14:21:46 +0000250
Christian Heimesbc873412007-12-08 22:11:32 +0000251Library
252-------
253
Raymond Hettinger48b8b662008-02-05 01:53:00 +0000254- Weakref dictionaries now inherit from MutableMapping.
255 XXX their API still needs to be modernized (i.e. eliminate the iter methods).
256
257- Created new UserDict class in collections module. This one inherits from and
Raymond Hettingerb3a65f82008-02-21 22:11:37 +0000258 complies with the MutableMapping ABC. Also, moved UserString and UserList
259 to the collections module. The MutableUserString class was removed.
Raymond Hettinger48b8b662008-02-05 01:53:00 +0000260
Guido van Rossumea6775b2008-02-21 20:16:31 +0000261- Removed UserDict.DictMixin. Replaced all its uses with
262 collections.MutableMapping.
Raymond Hettingeredf3b732008-02-04 22:07:15 +0000263
Guido van Rossume239b002008-01-06 00:44:20 +0000264- Issue #1703: getpass() should flush after writing prompt.
Christian Heimesfc5aa9d2007-12-11 09:00:01 +0000265
Guido van Rossume239b002008-01-06 00:44:20 +0000266- Issue #1585: IDLE uses non-existent xrange() function.
267
268- Issue #1578: Problems in win_getpass.
269
Georg Brandl52d168a2008-01-07 18:10:24 +0000270Build
271-----
272
273- Renamed --enable-unicode configure flag to --with-wide-unicode, since
274 Unicode strings can't be disabled anymore.
275
276
Guido van Rossume239b002008-01-06 00:44:20 +0000277C API
278-----
279
280- Issue #1629: Renamed Py_Size, Py_Type and Py_Refcnt to Py_SIZE,
281 Py_TYPE and Py_REFCNT.
282
283- New API PyImport_ImportModuleNoBlock(), works like PyImport_ImportModule()
284 but won't block on the import lock (returning an error instead).
Christian Heimes0ec88b32007-12-10 17:02:00 +0000285
Christian Heimesbc873412007-12-08 22:11:32 +0000286
Fred Drake0e474a82007-10-11 18:01:43 +0000287What's New in Python 3.0a2?
Christian Heimesbc873412007-12-08 22:11:32 +0000288===========================
Fred Drake0e474a82007-10-11 18:01:43 +0000289
Guido van Rossum99533a92007-12-06 05:07:41 +0000290*Release date: 07-Dec-2007*
291
292(Note: this list is incomplete.)
Fred Drake0e474a82007-10-11 18:01:43 +0000293
Guido van Rossum40d20bc2007-10-22 00:09:51 +0000294Core and Builtins
295-----------------
296
Brett Cannon37f7e6e2007-10-26 05:42:09 +0000297- str8 now has the same construction signature as bytes.
298
Brett Cannon40430012007-10-22 20:24:51 +0000299- Comparisons between str and str8 now return False/True for ==/!=. sqlite3
300 returns str8 when recreating on object from it's __conform__ value. The
301 struct module returns str8 for all string-related formats. This was true
302 before this change, but becomes more apparent thanks to string comparisons
303 always being False.
304
Guido van Rossum40d20bc2007-10-22 00:09:51 +0000305- Replaced `PyFile_FromFile()` with `PyFile_FromFd(fd, name. mode, buffer,
306 encoding, newline)`
307
308- Fixed `imp.find_module()` to obey the -*- coding: -*- header.
309
310- Changed `__file__` and `co_filename` to unicode. The path names are decoded
311 with `Py_FileSystemDefaultEncoding` and a new API method
312 `PyUnicode_DecodeFSDefault(char*)` was added.
313
Guido van Rossum2dced8b2007-10-30 17:27:30 +0000314- io.open() and _fileio.FileIO have grown a new argument closefd. A false
315 value disables the closing of the file descriptor.
316
Guido van Rossum98297ee2007-11-06 21:34:58 +0000317- Added a new option -b to issues warnings (-bb for errors) about certain
318 operations between bytes/buffer and str like str(b'') and comparsion.
319
Christian Heimes58cb1b82007-11-13 02:19:40 +0000320- The standards streams sys.stdin, stdout and stderr may be None when the
321 when the C runtime library returns an invalid file descriptor for the
322 streams (fileno(stdin) < 0). For now this happens only for Windows GUI
323 apps and scripts started with `pythonw.exe`.
324
Christian Heimesbce52be2007-11-17 19:08:41 +0000325- Added PCbuild9 directory for VS 2008.
326
327- Renamed structmember.h WRITE_RESTRICTED to PY_WRITE_RESTRICTED to work
328 around a name clash with VS 2008 on Windows.
329
Christian Heimesff737952007-11-27 10:40:20 +0000330- Unbound methods are gone for good. ClassObject.method returns an ordinary
331 function object, instance.method still returns a bound method object.
332 The API of bound methods is cleaned up, too. The im_class attribute is
333 removed and im_func + im_self are renamed to __func__ and __self__. The
334 factory PyMethod_New takes only func and instance as argument.
335
Christian Heimesf78b1c62007-12-02 16:52:32 +0000336- intobject.h is no longer included by Python.h. The remains were moved
337 to longobject.h. It still exists to define several aliases from PyInt_
338 to PyLong_ functions.
339
Christian Heimesa37d4c62007-12-04 23:02:19 +0000340- Removed sys.maxint, use sys.maxsize instead.
341
Christian Heimesbce52be2007-11-17 19:08:41 +0000342
Fred Drake0e474a82007-10-11 18:01:43 +0000343Extension Modules
344-----------------
345
346- The `hotshot` profiler has been removed; use `cProfile` instead.
347
348
Brett Cannone9fd2312007-10-12 19:18:19 +0000349Library
350-------
351
352- When loading an external file using testfile(), the passed-in encoding
353 argument was being ignored if __loader__ is defined and forcing the source to
354 be UTF-8.
355
Guido van Rossum687b9c02007-10-25 23:18:51 +0000356- The methods `os.tmpnam()`, `os.tempnam()` and `os.tmpfile()` have been
357 removed in favor of the tempfile module.
358
Christian Heimesc9543e42007-11-28 08:28:28 +0000359- Removed the 'new' module.
360
361- Removed all types from the 'types' module that are easily accessable through
362 builtins.
Brett Cannone9fd2312007-10-12 19:18:19 +0000363
Georg Brandl52d168a2008-01-07 18:10:24 +0000364
Guido van Rossum4405cf32007-08-30 17:16:55 +0000365What's New in Python 3.0a1?
Guido van Rossum45aecf42006-03-15 04:58:47 +0000366==========================
Thomas Wouters4d70c3d2006-06-08 14:42:34 +0000367
Guido van Rossum4405cf32007-08-30 17:16:55 +0000368*Release date: 31-Aug-2007*
Neal Norwitz4886cc32006-08-21 17:06:07 +0000369
370Core and Builtins
371-----------------
372
Martin v. Löwis47383402007-08-15 07:32:56 +0000373- PEP 3131: Support non-ASCII identifiers.
374
Martin v. Löwis447d33e2007-07-29 18:10:01 +0000375- PEP 3120: Change default encoding to UTF-8.
376
Martin v. Löwis9f2e3462007-07-21 17:22:18 +0000377- PEP 3123: Use proper C inheritance for PyObject.
378
Guido van Rossumcd16bf62007-06-13 18:07:49 +0000379- Removed the __oct__ and __hex__ special methods and added a bin()
380 builtin function.
381
382- PEP 3127: octal literals now start with "0o". Old-style octal literals
383 are invalid. There are binary literals with a prefix of "0b".
384 This also affects int(x, 0).
385
Guido van Rossume7ba4952007-06-06 23:52:48 +0000386- None, True, False are now keywords.
387
Guido van Rossum29478ef2007-05-29 00:39:44 +0000388- PEP 3119: isinstance() and issubclass() can be overridden.
389
Guido van Rossumebe3e162007-05-17 18:20:34 +0000390- Remove BaseException.message.
391
Guido van Rossum1bc535d2007-05-15 18:46:22 +0000392- Remove tuple parameter unpacking (PEP 3113).
393
Kurt B. Kaiser2c7f3142007-08-30 21:52:19 +0000394- Remove the f_restricted attribute from frames. This naturally leads to the
Guido van Rossuma8add0e2007-05-14 22:03:55 +0000395 removal of PyEval_GetRestricted() and PyFrame_IsRestricted().
396
Guido van Rossum0368b722007-05-11 16:50:42 +0000397- PEP 3132 was accepted. That means that you can do ``a, *b = range(5)``
398 to assign 0 to a and [1, 2, 3, 4] to b.
399
Guido van Rossum805365e2007-05-07 22:24:25 +0000400- range() now returns an iterator rather than a list. Floats are not allowed.
401 xrange() is no longer defined.
402
Nick Coghlan650f0d02007-04-15 12:05:43 +0000403- Patch #1660500: hide iteration variable in list comps, add set comps
404 and use common code to handle compilation of iterative expressions
405
Guido van Rossume27dc722007-03-27 22:37:34 +0000406- By default, != returns the opposite of ==, unless the latter returns
407 NotImplemented.
408
Collin Winter670e6922007-03-21 02:57:17 +0000409- Patch #1680961: sys.exitfunc has been removed and replaced with a private
410 C-level API.
411
Georg Brandl801dd732007-03-18 20:18:31 +0000412- PEP 3115: new metaclasses: the metaclass is now specified as a
413 keyword arg in the class statement, which can now use the full syntax of
414 a parameter list. Also, the metaclass can implement a __prepare__ function
415 which will be called to create the dictionary for the new class namespace.
416
Georg Brandl428f0642007-03-18 18:35:15 +0000417- The long-deprecated argument "pend" of PyFloat_FromString() has been
418 removed.
419
Georg Brandle32b4222007-03-10 22:13:27 +0000420- The dir() function has been extended to call the __dir__() method on
421 its argument, if it exists. If not, it will work like before. This allows
422 customizing the output of dir() in the presence of a __getattr__().
Brett Cannonba7bf492007-02-27 00:15:55 +0000423
Neal Norwitz8dfc4a92007-08-11 06:39:53 +0000424- Removed support for __members__ and __methods__.
425
Georg Brandle32b4222007-03-10 22:13:27 +0000426- Removed indexing/slicing on BaseException.
Neal Norwitz2633c692007-02-26 22:22:47 +0000427
Georg Brandle32b4222007-03-10 22:13:27 +0000428- input() became raw_input(): the name input() now implements the
Guido van Rossum0240b922007-02-26 21:23:50 +0000429 functionality formerly known as raw_input(); the name raw_input()
430 is no longer defined.
431
Brett Cannon39590462007-02-26 22:01:14 +0000432- Classes listed in an 'except' clause must inherit from BaseException.
Brett Cannonf74225d2007-02-26 21:10:16 +0000433
Guido van Rossumcc2b0162007-02-11 06:12:03 +0000434- PEP 3106: dict.iterkeys(), .iteritems(), .itervalues() are now gone;
Guido van Rossumcf1be882007-08-30 22:07:17 +0000435 and .keys(), .items(), .values() return dict views, which behave
436 like sets.
Guido van Rossumcc2b0162007-02-11 06:12:03 +0000437
Guido van Rossum8b545362007-02-09 23:52:14 +0000438- PEP 3105: print is now a function. Also (not in the PEP) the
439 'softspace' attribute of files is now gone (since print() doesn't use
440 it). A side effect of this change is that you can get incomplete
441 output lines in interactive sessions:
442
443 >>> print(42, end="")
Kurt B. Kaiser2c7f3142007-08-30 21:52:19 +0000444 42>>>
Guido van Rossum8b545362007-02-09 23:52:14 +0000445
446 We may be able to fix this after the I/O library rewrite.
Guido van Rossum4502c802007-02-09 05:42:38 +0000447
Brett Cannon398db8b2007-01-29 23:44:37 +0000448- PEP 3102: keyword-only arguments.
449
Guido van Rossumd4588c12007-02-13 19:55:23 +0000450- Int/Long unification is complete. The 'long' built-in type
Guido van Rossumec7027f2007-01-30 00:00:40 +0000451 and literals with trailing 'L' or 'l' have been removed.
452 Performance may be sub-optimal (haven't really benchmarked).
Guido van Rossumab186842007-01-14 03:42:30 +0000453
454- 'except E, V' must now be spelled as 'except E as V' and deletes V
455 at the end of the except clause; V must be a simple name.
456
Neal Norwitzc1505362006-12-28 06:47:50 +0000457- Added function annotations per PEP 3107.
458
Jeremy Hyltona4f9fc62007-02-27 15:53:28 +0000459- Added nonlocal declaration from PEP 3104
460
461 >>> def f(x):
462 ... def inc():
463 ... nonlocal x
464 ... x += 1
465 ... return x
466 ... return inc
467 ...
468 >>> inc = f(0)
469 >>> inc()
470 1
471 >>> inc()
472 2
473
Georg Brandl66a796e2006-12-19 20:50:34 +0000474- Moved intern() to sys.intern().
475
476- exec is now a function.
477
478- Renamed nb_nonzero to nb_bool and __nonzero__ to __bool__.
Jack Diederich4dafcc42006-11-28 19:15:13 +0000479
Neal Norwitz4886cc32006-08-21 17:06:07 +0000480- Classic classes are a thing of the past. All classes are new style.
481
482- Exceptions *must* derive from BaseException.
483
484- Integer division always returns a float. The -Q option is no more.
485 All the following are gone:
486 * PyNumber_Divide and PyNumber_InPlaceDivide
487 * __div__, __rdiv__, and __idiv__
488 * nb_divide, nb_inplace_divide
489 * operator.div, operator.idiv, operator.__div__, operator.__idiv__
490 (Only __truediv__ and __floordiv__ remain, not sure how to handle them
491 if we want to re-use __div__ and friends. If we do, it will make
492 it harder to write code for both 2.x and 3.x.)
493
494- 'as' and 'with' are keywords.
495
496- Absolute import is the default behavior for 'import foo' etc.
497
Neal Norwitz378b2c92006-08-29 07:57:22 +0000498- Removed support for syntax:
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000499 backticks (ie, `x`), <>
Neal Norwitz378b2c92006-08-29 07:57:22 +0000500
Neal Norwitz4886cc32006-08-21 17:06:07 +0000501- Removed these Python builtins:
Neal Norwitz01688022007-08-12 00:43:29 +0000502 apply(), callable(), coerce(), execfile(), file(), reduce(), reload()
Neal Norwitz4886cc32006-08-21 17:06:07 +0000503
Neal Norwitz378b2c92006-08-29 07:57:22 +0000504- Removed these Python methods:
505 {}.has_key
506
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000507- Removed these opcodes:
508 BINARY_DIVIDE, INPLACE_DIVIDE, UNARY_CONVERT
509
510- Remove C API support for restricted execution.
511
Guido van Rossumcf1be882007-08-30 22:07:17 +0000512- zip(), map() and filter() now return iterators, behaving like their
513 itertools counterparts. This also affect map()'s behavior on
514 sequences of unequal length -- it now stops after the shortest one
515 is exhausted.
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000516
517- Additions:
Guido van Rossumcf1be882007-08-30 22:07:17 +0000518 set literals, set comprehensions, ellipsis literal.
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000519
520- Added class decorators per PEP 3129.
521
522
523Extension Modules
524-----------------
525
526- Remove the imageop module. Obsolete long with its unit tests becoming
527 useless from the removal of rgbimg and imgfile.
Neal Norwitz4886cc32006-08-21 17:06:07 +0000528
529- Removed these attributes from Python modules:
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000530 * operator module: div, idiv, __div__, __idiv__, isCallable, sequenceIncludes
Guido van Rossume7ba4952007-06-06 23:52:48 +0000531 * sys module: exc_clear(), exc_type, exc_value, exc_traceback
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000532
533
534Library
535-------
536
537- Remove the compiler package. Use of the _ast module and (an eventual)
538 AST -> bytecode mechanism.
539
540- Removed these modules:
Guido van Rossum33d26892007-08-05 15:29:28 +0000541 * audiodev, Bastion, bsddb185, exceptions, linuxaudiodev,
542 md5, MimeWriter, mimify, popen2,
543 rexec, sets, sha, stringold, strop, sunaudiodev, timing, xmllib.
544
545- Moved these modules to Tools/Demos:
546 * toaiff
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000547
548- Remove obsolete IRIX modules: al/AL, cd/CD, cddb, cdplayer, cl/CL, DEVICE,
549 ERRNO, FILE, fl/FL, flp, fm, GET, gl/GL, GLWS, IN, imgfile, IOCTL, jpeg,
550 panel, panelparser, readcd, sgi, sv/SV, torgb, WAIT.
551
552- Remove obsolete functions:
553 * commands.getstatus(), os.popen*,
554
Martin v. Löwis967f1e32007-08-14 09:23:10 +0000555- Remove functions in the string module that are also string methods;
556 Remove string.{letters, lowercase, uppercase}.
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000557
558- Remove support for long obsolete platforms: plat-aix3, plat-irix5.
559
560- Remove xmlrpclib.SlowParser. It was based on xmllib.
561
562- Patch #1680961: atexit has been reimplemented in C.
563
Walter Dörwald41980ca2007-08-16 21:55:45 +0000564- Add new codecs for UTF-32, UTF-32-LE and UTF-32-BE.
565
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000566
567Build
568-----
569
570C API
571-----
572
573- Removed these Python slots:
574 __coerce__, __div__, __idiv__, __rdiv__
Neal Norwitz4886cc32006-08-21 17:06:07 +0000575
Neal Norwitz4886cc32006-08-21 17:06:07 +0000576- Removed these C APIs:
Neal Norwitz8dfc4a92007-08-11 06:39:53 +0000577 PyNumber_Coerce(), PyNumber_CoerceEx(), PyMember_Get, PyMember_Set
Neal Norwitz4886cc32006-08-21 17:06:07 +0000578
579- Removed these C slots/fields:
580 nb_divide, nb_inplace_divide
581
582- Removed these macros:
Neal Norwitz30d1c512007-08-19 22:48:23 +0000583 staticforward, statichere, PyArg_GetInt, PyArg_NoArgs, _PyObject_Del
Neal Norwitz4886cc32006-08-21 17:06:07 +0000584
585- Removed these typedefs:
586 intargfunc, intintargfunc, intobjargproc, intintobjargproc,
Neal Norwitz8dfc4a92007-08-11 06:39:53 +0000587 getreadbufferproc, getwritebufferproc, getsegcountproc, getcharbufferproc,
588 memberlist
Neal Norwitz4886cc32006-08-21 17:06:07 +0000589
Raymond Hettinger4901a1f2004-12-02 08:59:14 +0000590
Raymond Hettinger4901a1f2004-12-02 08:59:14 +0000591Tests
592-----
593
Brett Cannone7a30f72008-03-03 03:36:27 +0000594- Removed test.testall as test.regrtest replaces it.
595
596
Brett Cannonced04e02005-02-13 22:53:22 +0000597Documentation
598-------------
599
Raymond Hettinger4901a1f2004-12-02 08:59:14 +0000600Mac
601---
602
Guido van Rossume7ba4952007-06-06 23:52:48 +0000603- The cfmfile was removed.
604
605
Guido van Rossum845702c2007-08-30 18:44:53 +0000606Platforms
607---------
608
609- Support for BeOS and AtheOS was removed (according to PEP 11).
610
611- Support for RiscOS, Irix, Tru64 was removed (alledgedly).
612
Hye-Shik Chang4e422812005-07-17 02:36:59 +0000613
Raymond Hettinger4901a1f2004-12-02 08:59:14 +0000614Tools/Demos
615-----------
616
Skip Montanaroe5d7f7f2002-09-20 14:16:59 +0000617**(For information about older versions, consult the HISTORY file.)**