blob: 4ad61378045d371dfb79505f173a4558bf523b3c [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
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 Cannond8b61ee2008-05-11 03:00:26 +000024- The mhlib module has been removed.
25
Brett Cannonbd474422008-05-10 22:42:14 +000026- The ihooks module has been removed.
27
Brett Cannonb59a2bd2008-05-10 22:03:16 +000028- The fpformat module has been removed.
29
Brett Cannonf4fd9932008-05-10 21:11:46 +000030- The dircache module has been removed.
31
Brett Cannond175b4c2008-05-10 03:19:54 +000032- The Canvas module has been removed.
33
Mark Dickinsonb27406c2008-05-09 13:42:33 +000034- The Decimal module gained the magic methods __round__, __ceil__,
35 __floor__ and __trunc__, to give support for round, math.ceil,
36 math.floor and math.trunc.
37
Brett Cannon900ee3a2008-05-08 20:31:11 +000038- The user module has been removed.
39
Brett Cannon34afe872008-05-08 20:31:44 +000040- The mutex module has been removed.
41
Brett Cannon0d71ee72008-05-08 18:13:40 +000042- The imputil module has been removed.
43
Benjamin Petersond71ca412008-05-08 23:44:58 +000044- os.path.walk has been removed in favor of os.walk
45
Brett Cannon0d71ee72008-05-08 18:13:40 +000046Build
47-----
48
49
Barry Warsaw66079cd2008-04-04 01:36:36 +000050What's New in Python 3.0a5?
51===========================
52
Barry Warsaw9eab8b02008-05-08 13:05:38 +000053*Release date: 08-May-2008*
Barry Warsaw66079cd2008-04-04 01:36:36 +000054
55Core and Builtins
56-----------------
57
Mark Dickinson7ab6be22008-04-15 21:42:42 +000058- Fix misbehaviour of PyLong_FromSsize_t on systems where sizeof(size_t) >
59 sizeof(long).
60
Amaury Forgeot d'Arc7fedbe52008-04-10 21:03:09 +000061- Issue #2221: Corrected a SystemError "error return without exception set",
62 when the code executed by exec() raises an exception, and sys.stdout.flush()
63 also raises an error.
64
Martin v. Löwis250ad612008-04-07 05:43:42 +000065- Bug #2565: The repr() of type objects now calls them 'class',
66 not 'type' - whether they are builtin types or not.
67
Martin v. Löwis790465f2008-04-05 20:41:37 +000068- The command line processing was converted to pass Unicode strings
69 through as unmodified as possible; as a consequence, the C API
70 related to command line arguments was changed to use wchar_t.
71
Benjamin Petersona2f837f2008-04-28 21:05:10 +000072- All backslashes in raw strings are interpreted literally. This means that
73 '\u' and '\U' escapes are not treated specially.
74
Barry Warsaw66079cd2008-04-04 01:36:36 +000075Extension Modules
76-----------------
77
78Library
79-------
80
Thomas Hellerb041fda2008-04-30 17:11:46 +000081- ctypes objects now support the PEP3118 buffer interface
82
Thomas Hellere106dc32008-04-24 18:39:36 +000083- Issue #2682: ctypes callback functions now longer contain a cyclic
84 reference to themselves.
85
Lars Gustäbelc2ea8c62008-04-14 10:05:48 +000086- Issue #2058: Remove the buf attribute and add __slots__ to the TarInfo
87 class in order to reduce tarfile's memory usage.
88
Martin v. Löwis8efc62c2008-04-10 19:02:25 +000089- Bug #2606: Avoid calling .sort() on a dict_keys object.
90
Thomas Hellerbff533b2008-04-04 19:53:14 +000091- The bundled libffi copy is now in sync with the recently released
92 libffi3.0.5 version, apart from some small changes to
93 Modules/_ctypes/libffi/configure.ac.
94
Thomas Hellerf44b9a12008-04-04 10:18:23 +000095Build
96-----
97
Mark Dickinsonb0e2b4c2008-04-26 20:48:56 +000098- Issue #1496032: On alpha, use -mieee when gcc is the compiler.
99
Guido van Rossumdc21db32008-04-07 18:37:41 +0000100- "make install" is now an alias for "make altinstall", to prevent
101 accidentally overwriting a Python 2.x installation.
102 Use "make fullinstall" to force Python 3.0 to be installed as
103 "python".
104
Thomas Hellerf44b9a12008-04-04 10:18:23 +0000105- Issue #2544: On HP-UX systems, use 'gcc -shared' for linking when
106 gcc is used as compiler.
Barry Warsaw66079cd2008-04-04 01:36:36 +0000107
Barry Warsawa9d499d2008-03-01 18:38:07 +0000108What's New in Python 3.0a4?
109===========================
110
Barry Warsawbb5cd082008-04-02 23:33:27 +0000111*Release date: 02-Apr-2008*
Barry Warsawa9d499d2008-03-01 18:38:07 +0000112
Martin v. Löwis25931462008-03-17 20:43:42 +0000113Core and Builtins
114-----------------
115
116- Bug #2301: Don't try decoding the source code into the original
117 encoding for syntax errors.
118
Martin v. Löwis92fab752008-03-08 10:40:41 +0000119Extension Modules
120-----------------
121
Neal Norwitz6cf49cf2008-03-24 06:22:57 +0000122- The dl module was removed, use the ctypes module instead.
123
Martin v. Löwis92fab752008-03-08 10:40:41 +0000124- Use wchar_t functions in _locale module.
Barry Warsawa9d499d2008-03-01 18:38:07 +0000125
Martin v. Löwis071ef772008-03-08 11:24:24 +0000126Library
127-------
128
Martin v. Löwis73a22f02008-03-22 00:35:10 +0000129- The class distutils.commands.build_py.build_py_2to3 can be used
130 as a build_py replacement to automatically run 2to3 on modules
131 that are going to be installed.
132
Guido van Rossumf4169812008-03-17 22:56:06 +0000133- A new pickle protocol (protocol 3) is added with explicit support
134 for bytes. This is the default protocol. It intentionally cannot
135 be unpickled by Python 2.x.
136
137- When a pickle written by Python 2.x contains an (8-bit) str
138 instance, this is now decoded to a (Unicode) str instance. The
139 encoding used to do this defaults to ASCII, but can be overridden
140 via two new keyword arguments to the Unpickler class. Previously
141 this would create bytes instances, which is usually wrong: str
142 instances are often used to pickle attribute names etc., and text is
143 more common than binary data anyway.
144
Martin v. Löwis071ef772008-03-08 11:24:24 +0000145- Default to ASCII as the locale.getpreferredencoding, if the POSIX
146 system doesn't support CODESET and LANG isn't set or doesn't
147 allow deduction of an encoding.
148
Gregory P. Smith425136b2008-03-17 20:45:21 +0000149- Issue #1202: zlib.crc32 and zlib.adler32 now return an unsigned value.
150
Trent Nelson428de652008-03-18 22:41:35 +0000151- Issue #719888: Updated tokenize to use a bytes API. generate_tokens has been
152 renamed tokenize and now works with bytes rather than strings. A new
153 detect_encoding function has been added for determining source file encoding
154 according to PEP-0263. Token sequences returned by tokenize always start
155 with an ENCODING token which specifies the encoding used to decode the file.
156 This token is used to encode the output of untokenize back to bytes.
Barry Warsawa9d499d2008-03-01 18:38:07 +0000157
Christian Heimesbc873412007-12-08 22:11:32 +0000158What's New in Python 3.0a3?
159===========================
160
Barry Warsaw659fc422008-03-01 17:45:23 +0000161*Release date: 29-Feb-2008*
Christian Heimesbc873412007-12-08 22:11:32 +0000162
163Core and Builtins
164-----------------
165
Ka-Ping Yeeddaa7062008-03-17 20:35:15 +0000166- Issue #2282: io.TextIOWrapper was not overriding seekable() from io.IOBase.
167
Benjamin Petersonec79aad2008-04-02 22:44:10 +0000168- Issue #2115: Important speedup in setting __slot__ attributes. Also
169 prevent a possible crash: an Abstract Base Class would try to access a slot
Christian Heimesa156e092008-02-16 07:38:31 +0000170 on a registered virtual subclass.
171
172- Fixed repr() and str() of complex numbers with infinity or nan as real or
173 imaginary part.
174
175- Clear all free list during a gc.collect() of the highest generation in order
176 to allow pymalloc to free more arenas. Python may give back memory to the
177 OS earlier.
178
179- Issue #2045: Fix an infinite recursion triggered when printing a subclass of
180 collections.defaultdict, if its default_factory is set to a bound method.
181
182- Fixed a minor memory leak in dictobject.c. The content of the free
183 list was not freed on interpreter shutdown.
184
185- Limit free list of method and builtin function objects to 256 entries
186 each.
187
188- Patch #1953: Added ``sys._compact_freelists()`` and the C API functions
189 ``PyInt_CompactFreeList`` and ``PyFloat_CompactFreeList``
190 to compact the internal free lists of pre-allocted ints and floats.
191
192- Bug #1983: Fixed return type of fork(), fork1() and forkpty() calls.
193 Python expected the return type int but the fork familie returns pi_t.
194
195- Issue #1678380: Fix a bug that identifies 0j and -0j when they appear
196 in the same code unit.
197
Raymond Hettinger65baa342008-02-07 00:41:02 +0000198- Issue #2025 : Add tuple.count() and tuple.index() methods to comply with
199 the collections.Sequence API.
200
Christian Heimesdfc12ed2008-01-31 15:16:38 +0000201- Fixed multiple reinitialization of the Python interpreter. The small int
202 list in longobject.c has caused a seg fault during the third finalization.
203
Christian Heimesc04dac02008-01-30 11:27:57 +0000204- Issue #1973: bytes.fromhex('') raises SystemError
205
Raymond Hettinger70b64fc2008-01-30 20:15:17 +0000206- Issue #1771: remove cmp parameter from sorted() and list.sort()
207
Christian Heimes7b876152008-01-30 09:51:48 +0000208- Issue #1969: split and rsplit in bytearray are inconsistent
209
Raymond Hettinger736c0ab2008-03-13 02:09:15 +0000210- map() and no longer accepts None for the first argument.
Raymond Hettinger1dfde1d2008-01-22 23:25:35 +0000211 Use zip() instead.
212
Facundo Batista2336bdd2008-01-19 19:12:01 +0000213- Issue #1769: Now int("- 1") is not allowed any more.
214
Christian Heimes386cd1e2008-01-15 02:01:20 +0000215- Object/longobject.c: long(float('nan')) raises an OverflowError instead
216 of returning 0.
217
Christian Heimes3b06e532008-01-07 20:12:44 +0000218- Issue #1762972: __file__ points to the source file instead of the pyc/pyo
219 file if the py file exists.
220
Guido van Rossumab078dd2008-01-06 00:09:11 +0000221- Issue #1393: object_richcompare() returns NotImplemented instead of
222 False if the objects aren't equal, to give the other side a chance.
223
Guido van Rossume239b002008-01-06 00:44:20 +0000224- Issue #1692: Interpreter was not displaying location of SyntaxError.
Kurt B. Kaiser43b15092008-01-05 04:32:22 +0000225
Amaury Forgeot d'Arcbccd63c2008-01-04 01:21:27 +0000226- Improve some exception messages when Windows fails to load an extension
227 module. Now we get for example '%1 is not a valid Win32 application' instead
228 of 'error code 193'. Also use Unicode strings to deal with non-English
229 locales.
230
Christian Heimesa3534a62007-12-11 19:56:40 +0000231- Issue #1587: Added instancemethod wrapper for PyCFunctions. The Python C API
232 has gained a new type *PyInstanceMethod_Type* and the functions
233 *PyInstanceMethod_Check(o)*, *PyInstanceMethod_New(func)* and
234 *PyInstanceMethod_Function(im)*.
235
Amaury Forgeot d'Arcad8dcd52007-12-10 23:58:35 +0000236- Constants gc.DEBUG_OBJECT and gc.DEBUG_INSTANCE have been removed from the
237 gc module; gc.DEBUG_COLLECTABLE or gc.DEBUG_UNCOLLECTABLE are now enough to
238 print the corresponding list of objects considered by the garbage collector.
239
Guido van Rossume239b002008-01-06 00:44:20 +0000240- Issue #1573: Improper use of the keyword-only syntax makes the parser crash.
Christian Heimesbc873412007-12-08 22:11:32 +0000241
Christian Heimes0ded5b52007-12-10 15:50:56 +0000242- Issue #1564: The set implementation should special-case PyUnicode instead
Guido van Rossume239b002008-01-06 00:44:20 +0000243 of PyString.
Christian Heimes0ded5b52007-12-10 15:50:56 +0000244
Guido van Rossumea6775b2008-02-21 20:16:31 +0000245- Patch #1031213: Decode source line in SyntaxErrors back to its
246 original source encoding.
Christian Heimes7131fd92008-02-19 14:21:46 +0000247
Christian Heimes09aaa882008-02-23 15:01:06 +0000248- inspect.getsource() includes the decorators again.
249
Guido van Rossumea6775b2008-02-21 20:16:31 +0000250- Bug #1713: posixpath.ismount() claims symlink to a mountpoint is a
251 mountpoint.
Christian Heimes7131fd92008-02-19 14:21:46 +0000252
Christian Heimes7131fd92008-02-19 14:21:46 +0000253- Fix utf-8-sig incremental decoder, which didn't recognise a BOM when the
Guido van Rossumea6775b2008-02-21 20:16:31 +0000254 first chunk fed to the decoder started with a BOM, but was longer than 3
255 bytes.
Christian Heimes7131fd92008-02-19 14:21:46 +0000256
Christian Heimes7131fd92008-02-19 14:21:46 +0000257
Christian Heimesbc873412007-12-08 22:11:32 +0000258Extension Modules
259-----------------
260
Raymond Hettinger736c0ab2008-03-13 02:09:15 +0000261- Code for itertools ifilter(), imap(), and izip() moved to bultins and
262 renamed to filter(), map(), and zip(). Also, renamed izip_longest()
263 to zip_longest() and ifilterfalse() to filterfalse().
264
Christian Heimes043d6f62008-01-07 17:19:16 +0000265- Issue #1762972: Readded the reload() function as imp.reload()
Guido van Rossumea6775b2008-02-21 20:16:31 +0000266
Christian Heimesa156e092008-02-16 07:38:31 +0000267- Bug #2111: mmap segfaults when trying to write a block opened with PROT_READ
268
269- #2063: correct order of utime and stime in os.times() result on Windows.
Christian Heimesbc873412007-12-08 22:11:32 +0000270
Christian Heimes7131fd92008-02-19 14:21:46 +0000271
Christian Heimesbc873412007-12-08 22:11:32 +0000272Library
273-------
274
Raymond Hettinger48b8b662008-02-05 01:53:00 +0000275- Weakref dictionaries now inherit from MutableMapping.
276 XXX their API still needs to be modernized (i.e. eliminate the iter methods).
277
278- Created new UserDict class in collections module. This one inherits from and
Raymond Hettingerb3a65f82008-02-21 22:11:37 +0000279 complies with the MutableMapping ABC. Also, moved UserString and UserList
280 to the collections module. The MutableUserString class was removed.
Raymond Hettinger48b8b662008-02-05 01:53:00 +0000281
Guido van Rossumea6775b2008-02-21 20:16:31 +0000282- Removed UserDict.DictMixin. Replaced all its uses with
283 collections.MutableMapping.
Raymond Hettingeredf3b732008-02-04 22:07:15 +0000284
Guido van Rossume239b002008-01-06 00:44:20 +0000285- Issue #1703: getpass() should flush after writing prompt.
Christian Heimesfc5aa9d2007-12-11 09:00:01 +0000286
Guido van Rossume239b002008-01-06 00:44:20 +0000287- Issue #1585: IDLE uses non-existent xrange() function.
288
289- Issue #1578: Problems in win_getpass.
290
Georg Brandl52d168a2008-01-07 18:10:24 +0000291Build
292-----
293
294- Renamed --enable-unicode configure flag to --with-wide-unicode, since
295 Unicode strings can't be disabled anymore.
296
297
Guido van Rossume239b002008-01-06 00:44:20 +0000298C API
299-----
300
301- Issue #1629: Renamed Py_Size, Py_Type and Py_Refcnt to Py_SIZE,
302 Py_TYPE and Py_REFCNT.
303
304- New API PyImport_ImportModuleNoBlock(), works like PyImport_ImportModule()
305 but won't block on the import lock (returning an error instead).
Christian Heimes0ec88b32007-12-10 17:02:00 +0000306
Christian Heimesbc873412007-12-08 22:11:32 +0000307
Fred Drake0e474a82007-10-11 18:01:43 +0000308What's New in Python 3.0a2?
Christian Heimesbc873412007-12-08 22:11:32 +0000309===========================
Fred Drake0e474a82007-10-11 18:01:43 +0000310
Guido van Rossum99533a92007-12-06 05:07:41 +0000311*Release date: 07-Dec-2007*
312
313(Note: this list is incomplete.)
Fred Drake0e474a82007-10-11 18:01:43 +0000314
Guido van Rossum40d20bc2007-10-22 00:09:51 +0000315Core and Builtins
316-----------------
317
Brett Cannon37f7e6e2007-10-26 05:42:09 +0000318- str8 now has the same construction signature as bytes.
319
Brett Cannon40430012007-10-22 20:24:51 +0000320- Comparisons between str and str8 now return False/True for ==/!=. sqlite3
321 returns str8 when recreating on object from it's __conform__ value. The
322 struct module returns str8 for all string-related formats. This was true
323 before this change, but becomes more apparent thanks to string comparisons
324 always being False.
325
Guido van Rossum40d20bc2007-10-22 00:09:51 +0000326- Replaced `PyFile_FromFile()` with `PyFile_FromFd(fd, name. mode, buffer,
327 encoding, newline)`
328
329- Fixed `imp.find_module()` to obey the -*- coding: -*- header.
330
331- Changed `__file__` and `co_filename` to unicode. The path names are decoded
332 with `Py_FileSystemDefaultEncoding` and a new API method
333 `PyUnicode_DecodeFSDefault(char*)` was added.
334
Guido van Rossum2dced8b2007-10-30 17:27:30 +0000335- io.open() and _fileio.FileIO have grown a new argument closefd. A false
336 value disables the closing of the file descriptor.
337
Guido van Rossum98297ee2007-11-06 21:34:58 +0000338- Added a new option -b to issues warnings (-bb for errors) about certain
339 operations between bytes/buffer and str like str(b'') and comparsion.
340
Christian Heimes58cb1b82007-11-13 02:19:40 +0000341- The standards streams sys.stdin, stdout and stderr may be None when the
342 when the C runtime library returns an invalid file descriptor for the
343 streams (fileno(stdin) < 0). For now this happens only for Windows GUI
344 apps and scripts started with `pythonw.exe`.
345
Christian Heimesbce52be2007-11-17 19:08:41 +0000346- Added PCbuild9 directory for VS 2008.
347
348- Renamed structmember.h WRITE_RESTRICTED to PY_WRITE_RESTRICTED to work
349 around a name clash with VS 2008 on Windows.
350
Christian Heimesff737952007-11-27 10:40:20 +0000351- Unbound methods are gone for good. ClassObject.method returns an ordinary
352 function object, instance.method still returns a bound method object.
353 The API of bound methods is cleaned up, too. The im_class attribute is
354 removed and im_func + im_self are renamed to __func__ and __self__. The
355 factory PyMethod_New takes only func and instance as argument.
356
Christian Heimesf78b1c62007-12-02 16:52:32 +0000357- intobject.h is no longer included by Python.h. The remains were moved
358 to longobject.h. It still exists to define several aliases from PyInt_
359 to PyLong_ functions.
360
Christian Heimesa37d4c62007-12-04 23:02:19 +0000361- Removed sys.maxint, use sys.maxsize instead.
362
Christian Heimesbce52be2007-11-17 19:08:41 +0000363
Fred Drake0e474a82007-10-11 18:01:43 +0000364Extension Modules
365-----------------
366
367- The `hotshot` profiler has been removed; use `cProfile` instead.
368
369
Brett Cannone9fd2312007-10-12 19:18:19 +0000370Library
371-------
372
373- When loading an external file using testfile(), the passed-in encoding
374 argument was being ignored if __loader__ is defined and forcing the source to
375 be UTF-8.
376
Guido van Rossum687b9c02007-10-25 23:18:51 +0000377- The methods `os.tmpnam()`, `os.tempnam()` and `os.tmpfile()` have been
378 removed in favor of the tempfile module.
379
Christian Heimesc9543e42007-11-28 08:28:28 +0000380- Removed the 'new' module.
381
382- Removed all types from the 'types' module that are easily accessable through
383 builtins.
Brett Cannone9fd2312007-10-12 19:18:19 +0000384
Georg Brandl52d168a2008-01-07 18:10:24 +0000385
Guido van Rossum4405cf32007-08-30 17:16:55 +0000386What's New in Python 3.0a1?
Guido van Rossum45aecf42006-03-15 04:58:47 +0000387==========================
Thomas Wouters4d70c3d2006-06-08 14:42:34 +0000388
Guido van Rossum4405cf32007-08-30 17:16:55 +0000389*Release date: 31-Aug-2007*
Neal Norwitz4886cc32006-08-21 17:06:07 +0000390
391Core and Builtins
392-----------------
393
Martin v. Löwis47383402007-08-15 07:32:56 +0000394- PEP 3131: Support non-ASCII identifiers.
395
Martin v. Löwis447d33e2007-07-29 18:10:01 +0000396- PEP 3120: Change default encoding to UTF-8.
397
Martin v. Löwis9f2e3462007-07-21 17:22:18 +0000398- PEP 3123: Use proper C inheritance for PyObject.
399
Guido van Rossumcd16bf62007-06-13 18:07:49 +0000400- Removed the __oct__ and __hex__ special methods and added a bin()
401 builtin function.
402
403- PEP 3127: octal literals now start with "0o". Old-style octal literals
404 are invalid. There are binary literals with a prefix of "0b".
405 This also affects int(x, 0).
406
Guido van Rossume7ba4952007-06-06 23:52:48 +0000407- None, True, False are now keywords.
408
Guido van Rossum29478ef2007-05-29 00:39:44 +0000409- PEP 3119: isinstance() and issubclass() can be overridden.
410
Guido van Rossumebe3e162007-05-17 18:20:34 +0000411- Remove BaseException.message.
412
Guido van Rossum1bc535d2007-05-15 18:46:22 +0000413- Remove tuple parameter unpacking (PEP 3113).
414
Kurt B. Kaiser2c7f3142007-08-30 21:52:19 +0000415- Remove the f_restricted attribute from frames. This naturally leads to the
Guido van Rossuma8add0e2007-05-14 22:03:55 +0000416 removal of PyEval_GetRestricted() and PyFrame_IsRestricted().
417
Guido van Rossum0368b722007-05-11 16:50:42 +0000418- PEP 3132 was accepted. That means that you can do ``a, *b = range(5)``
419 to assign 0 to a and [1, 2, 3, 4] to b.
420
Guido van Rossum805365e2007-05-07 22:24:25 +0000421- range() now returns an iterator rather than a list. Floats are not allowed.
422 xrange() is no longer defined.
423
Nick Coghlan650f0d02007-04-15 12:05:43 +0000424- Patch #1660500: hide iteration variable in list comps, add set comps
425 and use common code to handle compilation of iterative expressions
426
Guido van Rossume27dc722007-03-27 22:37:34 +0000427- By default, != returns the opposite of ==, unless the latter returns
428 NotImplemented.
429
Collin Winter670e6922007-03-21 02:57:17 +0000430- Patch #1680961: sys.exitfunc has been removed and replaced with a private
431 C-level API.
432
Georg Brandl801dd732007-03-18 20:18:31 +0000433- PEP 3115: new metaclasses: the metaclass is now specified as a
434 keyword arg in the class statement, which can now use the full syntax of
435 a parameter list. Also, the metaclass can implement a __prepare__ function
436 which will be called to create the dictionary for the new class namespace.
437
Georg Brandl428f0642007-03-18 18:35:15 +0000438- The long-deprecated argument "pend" of PyFloat_FromString() has been
439 removed.
440
Georg Brandle32b4222007-03-10 22:13:27 +0000441- The dir() function has been extended to call the __dir__() method on
442 its argument, if it exists. If not, it will work like before. This allows
443 customizing the output of dir() in the presence of a __getattr__().
Brett Cannonba7bf492007-02-27 00:15:55 +0000444
Neal Norwitz8dfc4a92007-08-11 06:39:53 +0000445- Removed support for __members__ and __methods__.
446
Georg Brandle32b4222007-03-10 22:13:27 +0000447- Removed indexing/slicing on BaseException.
Neal Norwitz2633c692007-02-26 22:22:47 +0000448
Georg Brandle32b4222007-03-10 22:13:27 +0000449- input() became raw_input(): the name input() now implements the
Guido van Rossum0240b922007-02-26 21:23:50 +0000450 functionality formerly known as raw_input(); the name raw_input()
451 is no longer defined.
452
Brett Cannon39590462007-02-26 22:01:14 +0000453- Classes listed in an 'except' clause must inherit from BaseException.
Brett Cannonf74225d2007-02-26 21:10:16 +0000454
Guido van Rossumcc2b0162007-02-11 06:12:03 +0000455- PEP 3106: dict.iterkeys(), .iteritems(), .itervalues() are now gone;
Guido van Rossumcf1be882007-08-30 22:07:17 +0000456 and .keys(), .items(), .values() return dict views, which behave
457 like sets.
Guido van Rossumcc2b0162007-02-11 06:12:03 +0000458
Guido van Rossum8b545362007-02-09 23:52:14 +0000459- PEP 3105: print is now a function. Also (not in the PEP) the
460 'softspace' attribute of files is now gone (since print() doesn't use
461 it). A side effect of this change is that you can get incomplete
462 output lines in interactive sessions:
463
464 >>> print(42, end="")
Kurt B. Kaiser2c7f3142007-08-30 21:52:19 +0000465 42>>>
Guido van Rossum8b545362007-02-09 23:52:14 +0000466
467 We may be able to fix this after the I/O library rewrite.
Guido van Rossum4502c802007-02-09 05:42:38 +0000468
Brett Cannon398db8b2007-01-29 23:44:37 +0000469- PEP 3102: keyword-only arguments.
470
Guido van Rossumd4588c12007-02-13 19:55:23 +0000471- Int/Long unification is complete. The 'long' built-in type
Guido van Rossumec7027f2007-01-30 00:00:40 +0000472 and literals with trailing 'L' or 'l' have been removed.
473 Performance may be sub-optimal (haven't really benchmarked).
Guido van Rossumab186842007-01-14 03:42:30 +0000474
475- 'except E, V' must now be spelled as 'except E as V' and deletes V
476 at the end of the except clause; V must be a simple name.
477
Neal Norwitzc1505362006-12-28 06:47:50 +0000478- Added function annotations per PEP 3107.
479
Jeremy Hyltona4f9fc62007-02-27 15:53:28 +0000480- Added nonlocal declaration from PEP 3104
481
482 >>> def f(x):
483 ... def inc():
484 ... nonlocal x
485 ... x += 1
486 ... return x
487 ... return inc
488 ...
489 >>> inc = f(0)
490 >>> inc()
491 1
492 >>> inc()
493 2
494
Georg Brandl66a796e2006-12-19 20:50:34 +0000495- Moved intern() to sys.intern().
496
497- exec is now a function.
498
499- Renamed nb_nonzero to nb_bool and __nonzero__ to __bool__.
Jack Diederich4dafcc42006-11-28 19:15:13 +0000500
Neal Norwitz4886cc32006-08-21 17:06:07 +0000501- Classic classes are a thing of the past. All classes are new style.
502
503- Exceptions *must* derive from BaseException.
504
505- Integer division always returns a float. The -Q option is no more.
506 All the following are gone:
507 * PyNumber_Divide and PyNumber_InPlaceDivide
508 * __div__, __rdiv__, and __idiv__
509 * nb_divide, nb_inplace_divide
510 * operator.div, operator.idiv, operator.__div__, operator.__idiv__
511 (Only __truediv__ and __floordiv__ remain, not sure how to handle them
512 if we want to re-use __div__ and friends. If we do, it will make
513 it harder to write code for both 2.x and 3.x.)
514
515- 'as' and 'with' are keywords.
516
517- Absolute import is the default behavior for 'import foo' etc.
518
Neal Norwitz378b2c92006-08-29 07:57:22 +0000519- Removed support for syntax:
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000520 backticks (ie, `x`), <>
Neal Norwitz378b2c92006-08-29 07:57:22 +0000521
Neal Norwitz4886cc32006-08-21 17:06:07 +0000522- Removed these Python builtins:
Neal Norwitz01688022007-08-12 00:43:29 +0000523 apply(), callable(), coerce(), execfile(), file(), reduce(), reload()
Neal Norwitz4886cc32006-08-21 17:06:07 +0000524
Neal Norwitz378b2c92006-08-29 07:57:22 +0000525- Removed these Python methods:
526 {}.has_key
527
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000528- Removed these opcodes:
529 BINARY_DIVIDE, INPLACE_DIVIDE, UNARY_CONVERT
530
531- Remove C API support for restricted execution.
532
Guido van Rossumcf1be882007-08-30 22:07:17 +0000533- zip(), map() and filter() now return iterators, behaving like their
534 itertools counterparts. This also affect map()'s behavior on
535 sequences of unequal length -- it now stops after the shortest one
536 is exhausted.
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000537
538- Additions:
Guido van Rossumcf1be882007-08-30 22:07:17 +0000539 set literals, set comprehensions, ellipsis literal.
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000540
541- Added class decorators per PEP 3129.
542
543
544Extension Modules
545-----------------
546
547- Remove the imageop module. Obsolete long with its unit tests becoming
548 useless from the removal of rgbimg and imgfile.
Neal Norwitz4886cc32006-08-21 17:06:07 +0000549
550- Removed these attributes from Python modules:
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000551 * operator module: div, idiv, __div__, __idiv__, isCallable, sequenceIncludes
Guido van Rossume7ba4952007-06-06 23:52:48 +0000552 * sys module: exc_clear(), exc_type, exc_value, exc_traceback
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000553
554
555Library
556-------
557
558- Remove the compiler package. Use of the _ast module and (an eventual)
559 AST -> bytecode mechanism.
560
561- Removed these modules:
Guido van Rossum33d26892007-08-05 15:29:28 +0000562 * audiodev, Bastion, bsddb185, exceptions, linuxaudiodev,
563 md5, MimeWriter, mimify, popen2,
564 rexec, sets, sha, stringold, strop, sunaudiodev, timing, xmllib.
565
566- Moved these modules to Tools/Demos:
567 * toaiff
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000568
569- Remove obsolete IRIX modules: al/AL, cd/CD, cddb, cdplayer, cl/CL, DEVICE,
570 ERRNO, FILE, fl/FL, flp, fm, GET, gl/GL, GLWS, IN, imgfile, IOCTL, jpeg,
571 panel, panelparser, readcd, sgi, sv/SV, torgb, WAIT.
572
573- Remove obsolete functions:
574 * commands.getstatus(), os.popen*,
575
Martin v. Löwis967f1e32007-08-14 09:23:10 +0000576- Remove functions in the string module that are also string methods;
577 Remove string.{letters, lowercase, uppercase}.
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000578
579- Remove support for long obsolete platforms: plat-aix3, plat-irix5.
580
581- Remove xmlrpclib.SlowParser. It was based on xmllib.
582
583- Patch #1680961: atexit has been reimplemented in C.
584
Walter Dörwald41980ca2007-08-16 21:55:45 +0000585- Add new codecs for UTF-32, UTF-32-LE and UTF-32-BE.
586
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000587
588Build
589-----
590
591C API
592-----
593
594- Removed these Python slots:
595 __coerce__, __div__, __idiv__, __rdiv__
Neal Norwitz4886cc32006-08-21 17:06:07 +0000596
Neal Norwitz4886cc32006-08-21 17:06:07 +0000597- Removed these C APIs:
Neal Norwitz8dfc4a92007-08-11 06:39:53 +0000598 PyNumber_Coerce(), PyNumber_CoerceEx(), PyMember_Get, PyMember_Set
Neal Norwitz4886cc32006-08-21 17:06:07 +0000599
600- Removed these C slots/fields:
601 nb_divide, nb_inplace_divide
602
603- Removed these macros:
Neal Norwitz30d1c512007-08-19 22:48:23 +0000604 staticforward, statichere, PyArg_GetInt, PyArg_NoArgs, _PyObject_Del
Neal Norwitz4886cc32006-08-21 17:06:07 +0000605
606- Removed these typedefs:
607 intargfunc, intintargfunc, intobjargproc, intintobjargproc,
Neal Norwitz8dfc4a92007-08-11 06:39:53 +0000608 getreadbufferproc, getwritebufferproc, getsegcountproc, getcharbufferproc,
609 memberlist
Neal Norwitz4886cc32006-08-21 17:06:07 +0000610
Raymond Hettinger4901a1f2004-12-02 08:59:14 +0000611
Raymond Hettinger4901a1f2004-12-02 08:59:14 +0000612Tests
613-----
614
Brett Cannone7a30f72008-03-03 03:36:27 +0000615- Removed test.testall as test.regrtest replaces it.
616
617
Brett Cannonced04e02005-02-13 22:53:22 +0000618Documentation
619-------------
620
Raymond Hettinger4901a1f2004-12-02 08:59:14 +0000621Mac
622---
623
Guido van Rossume7ba4952007-06-06 23:52:48 +0000624- The cfmfile was removed.
625
626
Guido van Rossum845702c2007-08-30 18:44:53 +0000627Platforms
628---------
629
630- Support for BeOS and AtheOS was removed (according to PEP 11).
631
632- Support for RiscOS, Irix, Tru64 was removed (alledgedly).
633
Hye-Shik Chang4e422812005-07-17 02:36:59 +0000634
Raymond Hettinger4901a1f2004-12-02 08:59:14 +0000635Tools/Demos
636-----------
637
Skip Montanaroe5d7f7f2002-09-20 14:16:59 +0000638**(For information about older versions, consult the HISTORY file.)**