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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
Antoine Pitrou6e1df8d2008-07-25 19:58:18 +00007What's new in Python 3.0b3?
8===========================
9
10*Release date: XX-XXX-2008*
11
Antoine Pitrou9a2310d2008-07-25 22:39:39 +000012Core and Builtins
13-----------------
14
15- Issue #1819: function calls with several named parameters are now on
16 average 35% faster (as measured by pybench).
17
Marc-André Lemburg4cc0f242008-08-07 18:54:33 +000018- The undocumented C APIs PyUnicode_AsString() and
19 PyUnicode_AsStringAndSize() were made private to the interpreter, in
20 order to be able to refine their interfaces for Python 3.1.
21
22 If you need to access the UTF-8 representation of a Unicode object
23 as bytes string, please use PyUnicode_AsUTF8String() instead.
24
Antoine Pitrouaf14b792008-08-07 21:50:41 +000025- Issue #3460: PyUnicode_Join() implementation is 10% to 80% faster thanks
26 to Python 3.0's stricter semantics which allow to avoid successive
27 reallocations of the result string (this also affects str.join()).
28
Marc-André Lemburg4cc0f242008-08-07 18:54:33 +000029
Antoine Pitrou6e1df8d2008-07-25 19:58:18 +000030Library
31-------
32
Antoine Pitrou87695762008-08-14 22:44:29 +000033- Issue #3476: binary buffered reading through the new "io" library is now
34 thread-safe.
35
Robert Schuppenies3d1c7de2008-08-10 11:28:17 +000036- Issue #1342811: Fix leak in Tkinter.Menu.delete. Commands associated to
37 menu entries were not deleted.
38
Lars Gustäbel0c24e8b2008-08-02 11:43:24 +000039- Remove the TarFileCompat class from tarfile.py.
40
Amaury Forgeot d'Arcbdbddf82008-08-01 00:06:49 +000041- Issue #2491: os.fdopen is now almost an alias for the built-in open(), and
42 accepts the same parameters. It just checks that its first argument is an
43 integer.
44
Antoine Pitrou6e1df8d2008-07-25 19:58:18 +000045- Issue #3394: zipfile.writestr sets external attributes when passed a
46 file name rather than a ZipInfo instance, so files are extracted with
47 mode 0600 rather than 000 under Unix.
48
Antoine Pitrouc66f9092008-07-28 19:46:11 +000049- Issue #2523: Fix quadratic behaviour when read()ing a binary file without
50 asking for a specific length.
Antoine Pitrou6e1df8d2008-07-25 19:58:18 +000051
Amaury Forgeot d'Arc9196dc62008-06-19 20:54:32 +000052What's new in Python 3.0b2?
53===========================
54
Barry Warsaw4bd1cef2008-07-18 02:28:44 +000055*Release date: 17-Jul-2008*
Amaury Forgeot d'Arc9196dc62008-06-19 20:54:32 +000056
57Core and Builtins
58-----------------
59
Mark Dickinson65fe25e2008-07-16 11:30:51 +000060- Issue #3008: the float type has a new instance method 'float.hex'
61 and a new class method 'float.fromhex' to convert floating-point
62 numbers to and from hexadecimal strings, respectively.
63
Eric Smithd68af8f2008-07-16 00:15:35 +000064- Issue #3083: Add alternate (#) formatting for bin, oct, hex output
65 for str.format(). This adds the prefix 0b, 0o, or 0x, respectively.
66
Amaury Forgeot d'Arca4db6862008-07-04 21:26:43 +000067- Issue #3280: like chr(), the "%c" format now accepts unicode code points
68 beyond the Basic Multilingual Plane (above 0xffff) on all configurations. On
69 "narrow Unicode" builds, the result is a string of 2 code units, forming a
70 UTF-16 surrogate pair.
71
Georg Brandld52429f2008-07-04 15:55:02 +000072- Issue #3282: str.isprintable() should return False for undefined
73 Unicode characters.
74
Martin v. Löwis029656f2008-06-30 04:06:08 +000075- Issue #3236: Return small longs from PyLong_FromString.
76
Benjamin Petersone6528212008-07-15 15:32:09 +000077- Exception tracebacks now support exception chaining.
78
Amaury Forgeot d'Arc9196dc62008-06-19 20:54:32 +000079Library
80-------
81
Brett Cannonc2542e92008-07-25 18:19:20 +000082- Removed the sunaudio module. Use sunau instead.
83
Georg Brandl30704ea02008-07-23 15:07:12 +000084- Removed "ast" function aliases from the parser module.
85
Thomas Heller15383a02008-07-15 19:46:52 +000086- Issue #3313: Fixed a crash when a failed dlopen() call does not set
87 a valid dlerror() message.
88
Thomas Heller0261e1e2008-07-15 17:25:07 +000089- Issue #3258: Fixed a crash when a ctypes POINTER type to an
90 incomplete structure was created.
91
Georg Brandl1abcbf82008-07-01 19:28:43 +000092- Issue #2683: Fix inconsistency in subprocess.Popen.communicate(): the
93 argument now must be a bytes object in any case.
94
Amaury Forgeot d'Arc9196dc62008-06-19 20:54:32 +000095- Issue #3145: help("modules whatever") failed when trying to load the source
96 code of every single module of the standard library, including invalid files
97 used in the test suite.
98
Georg Brandlbded4d32008-07-17 18:15:35 +000099- The gettext library now consistently uses Unicode strings for message ids
100 and message strings, and ``ugettext()`` and the like don't exist anymore.
Benjamin Peterson801844d2008-07-14 14:32:15 +0000101
Benjamin Petersone6528212008-07-15 15:32:09 +0000102- The traceback module has been expanded to handle chained exceptions.
103
Amaury Forgeot d'Arc612f61f2008-07-02 23:02:21 +0000104C API
105-----
106
107- Issue #3247: the function Py_FindMethod was removed. Modern types should
108 use the tp_methods slot instead.
109
Benjamin Petersonde9c8692008-07-01 18:23:09 +0000110Tools/Demos
111-----------
112
Georg Brandl336341f2008-07-01 20:21:28 +0000113- The Mac/Demos directory has been removed.
Benjamin Petersonde9c8692008-07-01 18:23:09 +0000114
Georg Brandl336341f2008-07-01 20:21:28 +0000115- All of the Mac scripts have been removed (including BuildApplet.py).
Benjamin Petersonde9c8692008-07-01 18:23:09 +0000116
117
Brett Cannon0d71ee72008-05-08 18:13:40 +0000118What's new in Python 3.0b1?
119===========================
120
Barry Warsawc1e689e2008-06-19 00:35:43 +0000121*Release date: 18-Jun-2008*
Brett Cannon0d71ee72008-05-08 18:13:40 +0000122
123Core and Builtins
124-----------------
125
Brett Cannondb734912008-06-27 00:52:15 +0000126- Issue #3211: warnings.warn_explicit() did not guard against its 'registry'
127 argument being anything other than a dict or None. Also fixed a bug in error
128 handling when 'message' and 'category' were both set to None, triggering a
129 bus error.
130
Amaury Forgeot d'Arcc856c7a2008-06-16 19:50:09 +0000131- Issue #3100: Corrected a crash on deallocation of a subclassed weakref which
132 holds the last (strong) reference to its referent.
133
Georg Brandl559e5d72008-06-11 18:37:52 +0000134- Issue #2630: implement PEP 3138. repr() now returns printable
135 Unicode characters unescaped, to get an ASCII-only representation
136 of an object use ascii().
137
Amaury Forgeot d'Arcf1ca0b12008-06-11 17:40:47 +0000138- Issue #1342: On windows, Python could not start when installed in a
139 directory with non-ascii characters.
140
Martin v. Löwis1a214512008-06-11 05:26:20 +0000141- Implement PEP 3121: new module initialization and finalization API.
142
Georg Brandle1b5ac62008-06-04 13:06:58 +0000143- Removed the already-defunct ``-t`` option.
144
Amaury Forgeot d'Arc74c71f52008-05-26 21:41:42 +0000145- Issue #2957: Corrected a ValueError "recursion limit exceeded", when
146 unmarshalling many code objects, which happens when importing a
147 large .pyc file (~1000 functions).
148
Georg Brandl52b92cc2008-05-25 09:43:03 +0000149- Issue #2963: fix merging oversight that disabled method cache for
150 all types.
Georg Brandl1bcf35a2008-05-25 09:32:09 +0000151
Georg Brandlc9b09532008-05-25 09:24:38 +0000152- Issue #2964: fix a missing INCREF in instancemethod_descr_get.
153
Georg Brandl52b92cc2008-05-25 09:43:03 +0000154- Issue #2895: Don't crash when given bytes objects as keyword names.
Georg Brandld8b690f2008-05-16 17:28:50 +0000155
Georg Brandl52b92cc2008-05-25 09:43:03 +0000156- Issue #2798: When parsing arguments with PyArg_ParseTuple, the "s"
157 code now allows any unicode string and returns a utf-8 encoded
158 buffer, just like the "s#" code already does. The "z" code was
159 corrected as well.
Amaury Forgeot d'Arc07404592008-05-12 13:19:07 +0000160
Georg Brandl52b92cc2008-05-25 09:43:03 +0000161- Issue #2863: generators now have a ``gen.__name__`` attribute that
162 equals ``gen.gi_code.co_name``, like ``func.__name___`` that equals
163 ``func.func_code.co_name``. The repr() of a generator now also
164 contains this name.
Alexandre Vassalottie9f305f2008-05-16 04:39:54 +0000165
166- Issue #2831: enumerate() now has a ``start`` argument.
167
Georg Brandl52b92cc2008-05-25 09:43:03 +0000168- Issue #2801: fix bug in the float.is_integer method where a
169 ValueError was sometimes incorrectly raised.
Mark Dickinsonc4352b02008-05-09 13:55:01 +0000170
Georg Brandl52b92cc2008-05-25 09:43:03 +0000171- The ``--with-toolbox-glue`` option (and the associated
172 pymactoolbox.h) have been removed.
Benjamin Peterson79629ab2008-05-14 21:07:12 +0000173
Georg Brandl52b92cc2008-05-25 09:43:03 +0000174- Issue #2196: hasattr() now lets exceptions which do not inherit
175 Exception (KeyboardInterrupt, and SystemExit) propagate instead of
176 ignoring them.
Alexandre Vassalottieca20b62008-05-16 02:54:33 +0000177
Benjamin Petersoneec3d712008-06-11 15:59:43 +0000178- #3021 Exception reraising sematics have been significantly improved. However,
179 f_exc_type, f_exc_value, and f_exc_traceback cannot be accessed from Python
180 code anymore.
181
Benjamin Peterson4f92ca42008-06-11 20:21:57 +0000182- Three of PyNumberMethods' members, nb_coerce, nb_hex, and nb_oct, have been
183 removed.
184
Brett Cannon0d71ee72008-05-08 18:13:40 +0000185Extension Modules
186-----------------
187
Georg Brandl38feaf02008-05-25 07:45:51 +0000188- Renamed ``_winreg`` module to ``winreg``.
189
Georg Brandl52b92cc2008-05-25 09:43:03 +0000190- Support os.O_ASYNC and fcntl.FASYNC if the constants exist on the
191 platform.
Alexandre Vassalottibee32532008-05-16 18:15:12 +0000192
193- Support for Windows 9x has been removed from the winsound module.
194
Georg Brandl52b92cc2008-05-25 09:43:03 +0000195- Issue #2870: cmathmodule.c compile error.
Alexandre Vassalottieca20b62008-05-16 02:54:33 +0000196
Brett Cannon0d71ee72008-05-08 18:13:40 +0000197Library
198-------
199
Amaury Forgeot d'Arccb0d2d72008-06-18 22:19:22 +0000200- Patch #3133: http.server.CGIHTTPRequestHandler did not work on windows.
201
Jeremy Hylton1afc1692008-06-18 20:49:58 +0000202- a new ``urllib`` package was created. It consists of code from
203 ``urllib``, ``urllib2``, ``urlparse``, and ``robotparser``. The old
204 modules have all been removed. The new package has five submodules:
205 ``urllib.parse``, ``urllib.request``, ``urllib.response``,
206 ``urllib.error``, and ``urllib.robotparser``. The
207 ``urllib.request.urlopen()`` function uses the url opener from
208 ``urllib2``. (Note that the unittests have not been renamed for the
209 beta, but they will be renamed in the future.)
210
Benjamin Petersona0c0a4a2008-06-12 22:15:50 +0000211- rfc822 has been removed in favor of the email package.
212
Benjamin Peterson425ea7f2008-06-12 14:11:35 +0000213- mimetools has been removed in favor of the email package.
Benjamin Peterson23c51a22008-06-12 14:06:57 +0000214
Barry Warsawf5019422008-06-12 02:42:00 +0000215- Patch #2849: Remove use of rfc822 module from standard library.
216
Alexandre Vassalotti794652d2008-06-11 22:58:36 +0000217- Added C optimized implementation of io.StringIO.
218
Alexandre Vassalottica2d6102008-06-12 18:26:05 +0000219- The ``pickle`` module is now automatically use an optimized C
220 implementation of Pickler and Unpickler when available. The
221 ``cPickle`` module is no longer needed.
222
Georg Brandl877b10a2008-06-01 21:25:55 +0000223- Removed the ``htmllib`` and ``sgmllib`` modules.
224
Georg Brandl61013952008-05-28 15:56:30 +0000225- The deprecated ``SmartCookie`` and ``SimpleCookie`` classes have
226 been removed from ``http.cookies``.
227
Brett Cannona23810f2008-05-26 19:04:21 +0000228- The ``commands`` module has been removed. Its getoutput() and
229 getstatusoutput() functions have been moved to the ``subprocess`` module.
230
Georg Brandl3d5c4252008-05-26 18:03:26 +0000231- The ``http`` package was created; it contains the old ``httplib``
232 as ``http.client``, ``Cookie`` as ``http.cookies``, ``cookielib``
233 as ``http.cookiejar``, and the content of the three ``HTTPServer``
234 modules as ``http.server``.
235
Georg Brandl38eceaa2008-05-26 11:14:17 +0000236- The ``xmlrpc`` package was created; it contains the old
237 ``xmlrpclib`` module as ``xmlrpc.client`` and the content of
238 the old ``SimpleXMLRPCServer`` and ``DocXMLRPCServer`` modules
Antoine Pitrou6e1df8d2008-07-25 19:58:18 +0000239 as ``xmlrpc.server``.
Georg Brandl38eceaa2008-05-26 11:14:17 +0000240
241- The ``dbm`` package was created, containing the old modules
242 ``anydbm`` and ``whichdb`` in its ``__init__.py``, and having
243 ``dbm.gnu`` (was ``gdbm``), ``dbm.bsd`` (was ``dbhash``),
244 ``dbm.ndbm`` (was ``dbm``) and ``dbm.dumb`` (was ``dumbdbm``)
245 as submodules.
246
Georg Brandl52b92cc2008-05-25 09:43:03 +0000247- The ``repr`` module has been renamed to ``reprlib``.
Alexandre Vassalotti1f2ba4b2008-05-16 07:12:44 +0000248
Georg Brandl52b92cc2008-05-25 09:43:03 +0000249- The ``statvfs`` module has been removed.
Brett Cannonacbb7862008-05-16 00:42:57 +0000250
Georg Brandl52b92cc2008-05-25 09:43:03 +0000251- Issue #1713041: fix pprint's handling of maximum depth.
Alexandre Vassalottieca20b62008-05-16 02:54:33 +0000252
Georg Brandl52b92cc2008-05-25 09:43:03 +0000253- Issue #2250: Exceptions raised during evaluation of names in
254 rlcompleter's ``Completer.complete()`` method are now caught and
255 ignored.
Alexandre Vassalotti8ae3e052008-05-16 00:41:41 +0000256
Georg Brandl52b92cc2008-05-25 09:43:03 +0000257- Patch #2659: Added ``break_on_hyphens`` option to textwrap's
258 ``TextWrapper`` class.
Alexandre Vassalotti1d1eaa42008-05-14 22:59:42 +0000259
Alexandre Vassalotti6461e102008-05-15 22:09:29 +0000260- Issue #2487: change the semantics of math.ldexp(x, n) when n is too
261 large to fit in a C long. ldexp(x, n) now returns a zero (with
262 suitable sign) if n is large and negative; previously, it raised
263 OverflowError.
264
Georg Brandl52b92cc2008-05-25 09:43:03 +0000265- The ``ConfigParser`` module has been renamed to ``configparser``.
Alexandre Vassalotti5f8ced22008-05-16 00:03:33 +0000266
Georg Brandl52b92cc2008-05-25 09:43:03 +0000267- Issue #2865: webbrowser.open() works again in a KDE environment.
Amaury Forgeot d'Arc2b2b44d2008-05-12 14:41:00 +0000268
Georg Brandl52b92cc2008-05-25 09:43:03 +0000269- The ``multifile`` module has been removed.
Brett Cannond3343cb2008-05-12 03:18:21 +0000270
Georg Brandl52b92cc2008-05-25 09:43:03 +0000271- The ``SocketServer`` module has been renamed to ``socketserver``.
Alexandre Vassalottice261952008-05-12 02:31:37 +0000272
Georg Brandl52b92cc2008-05-25 09:43:03 +0000273- Fixed the ``__all__`` setting on ``collections`` to include
274 ``UserList`` and ``UserString``.
Brett Cannon23a4a7b2008-05-12 00:56:28 +0000275
Brett Cannoncf3520c2008-05-11 22:47:58 +0000276- The sre module has been removed.
277
Alexandre Vassalottif260e442008-05-11 19:59:59 +0000278- The Queue module has been renamed to queue.
279
Alexandre Vassalottif7fa63d2008-05-11 08:55:36 +0000280- The copy_reg module has been renamed to copyreg.
281
Brett Cannond8b61ee2008-05-11 03:00:26 +0000282- The mhlib module has been removed.
283
Brett Cannonbd474422008-05-10 22:42:14 +0000284- The ihooks module has been removed.
285
Brett Cannonb59a2bd2008-05-10 22:03:16 +0000286- The fpformat module has been removed.
287
Brett Cannonf4fd9932008-05-10 21:11:46 +0000288- The dircache module has been removed.
289
Brett Cannond175b4c2008-05-10 03:19:54 +0000290- The Canvas module has been removed.
291
Mark Dickinsonb27406c2008-05-09 13:42:33 +0000292- The Decimal module gained the magic methods __round__, __ceil__,
293 __floor__ and __trunc__, to give support for round, math.ceil,
294 math.floor and math.trunc.
295
Brett Cannon900ee3a2008-05-08 20:31:11 +0000296- The user module has been removed.
297
Brett Cannon34afe872008-05-08 20:31:44 +0000298- The mutex module has been removed.
299
Brett Cannon0d71ee72008-05-08 18:13:40 +0000300- The imputil module has been removed.
301
Georg Brandl52b92cc2008-05-25 09:43:03 +0000302- os.path.walk has been removed in favor of os.walk.
Benjamin Petersond71ca412008-05-08 23:44:58 +0000303
Alexandre Vassalotti5f8ced22008-05-16 00:03:33 +0000304- pdb gained the "until" command.
305
Georg Brandl52b92cc2008-05-25 09:43:03 +0000306- The test.test_support module has been renamed to test.support.
Benjamin Petersonee8712c2008-05-20 21:35:26 +0000307
Georg Brandlf9926402008-06-13 06:32:25 +0000308- The threading module API was renamed to be PEP 8 complaint.
Benjamin Peterson672b8032008-06-11 19:14:14 +0000309
Georg Brandl294d5a92008-06-01 19:25:32 +0000310Tools/Demos
311-----------
312
313- The bgen tool has been removed.
Benjamin Peterson630c8292008-06-01 18:50:38 +0000314
Brett Cannon0d71ee72008-05-08 18:13:40 +0000315Build
316-----
317
318
Barry Warsaw66079cd2008-04-04 01:36:36 +0000319What's New in Python 3.0a5?
320===========================
321
Barry Warsaw9eab8b02008-05-08 13:05:38 +0000322*Release date: 08-May-2008*
Barry Warsaw66079cd2008-04-04 01:36:36 +0000323
324Core and Builtins
325-----------------
326
Georg Brandl52b92cc2008-05-25 09:43:03 +0000327- Fixed misbehaviour of PyLong_FromSsize_t on systems where
328 sizeof(size_t) > sizeof(long).
Mark Dickinson7ab6be22008-04-15 21:42:42 +0000329
Georg Brandl52b92cc2008-05-25 09:43:03 +0000330- Issue #2221: Corrected a SystemError "error return without exception
331 set", when the code executed by exec() raises an exception, and
332 sys.stdout.flush() also raises an error.
Amaury Forgeot d'Arc7fedbe52008-04-10 21:03:09 +0000333
Georg Brandl52b92cc2008-05-25 09:43:03 +0000334- Bug #2565: The repr() of type objects now calls them 'class', not
335 'type' - whether they are builtin types or not.
Martin v. Löwis250ad612008-04-07 05:43:42 +0000336
Martin v. Löwis790465f2008-04-05 20:41:37 +0000337- The command line processing was converted to pass Unicode strings
338 through as unmodified as possible; as a consequence, the C API
339 related to command line arguments was changed to use wchar_t.
340
Georg Brandl52b92cc2008-05-25 09:43:03 +0000341- All backslashes in raw strings are interpreted literally. This
342 means that '\u' and '\U' escapes are not treated specially.
Benjamin Petersona2f837f2008-04-28 21:05:10 +0000343
Barry Warsaw66079cd2008-04-04 01:36:36 +0000344Extension Modules
345-----------------
346
347Library
348-------
349
Georg Brandl52b92cc2008-05-25 09:43:03 +0000350- ctypes objects now support the PEP3118 buffer interface.
Thomas Hellerb041fda2008-04-30 17:11:46 +0000351
Thomas Hellere106dc32008-04-24 18:39:36 +0000352- Issue #2682: ctypes callback functions now longer contain a cyclic
353 reference to themselves.
354
Georg Brandl52b92cc2008-05-25 09:43:03 +0000355- Issue #2058: Remove the buf attribute and add __slots__ to the
356 TarInfo class in order to reduce tarfile's memory usage.
Lars Gustäbelc2ea8c62008-04-14 10:05:48 +0000357
Martin v. Löwis8efc62c2008-04-10 19:02:25 +0000358- Bug #2606: Avoid calling .sort() on a dict_keys object.
359
Thomas Hellerbff533b2008-04-04 19:53:14 +0000360- The bundled libffi copy is now in sync with the recently released
361 libffi3.0.5 version, apart from some small changes to
362 Modules/_ctypes/libffi/configure.ac.
363
Thomas Hellerf44b9a12008-04-04 10:18:23 +0000364Build
365-----
366
Mark Dickinsonb0e2b4c2008-04-26 20:48:56 +0000367- Issue #1496032: On alpha, use -mieee when gcc is the compiler.
368
Guido van Rossumdc21db32008-04-07 18:37:41 +0000369- "make install" is now an alias for "make altinstall", to prevent
Georg Brandl52b92cc2008-05-25 09:43:03 +0000370 accidentally overwriting a Python 2.x installation. Use "make
371 fullinstall" to force Python 3.0 to be installed as "python".
Guido van Rossumdc21db32008-04-07 18:37:41 +0000372
Thomas Hellerf44b9a12008-04-04 10:18:23 +0000373- Issue #2544: On HP-UX systems, use 'gcc -shared' for linking when
374 gcc is used as compiler.
Barry Warsaw66079cd2008-04-04 01:36:36 +0000375
Georg Brandl52b92cc2008-05-25 09:43:03 +0000376
Barry Warsawa9d499d2008-03-01 18:38:07 +0000377What's New in Python 3.0a4?
378===========================
379
Barry Warsawbb5cd082008-04-02 23:33:27 +0000380*Release date: 02-Apr-2008*
Barry Warsawa9d499d2008-03-01 18:38:07 +0000381
Martin v. Löwis25931462008-03-17 20:43:42 +0000382Core and Builtins
383-----------------
384
385- Bug #2301: Don't try decoding the source code into the original
386 encoding for syntax errors.
387
Martin v. Löwis92fab752008-03-08 10:40:41 +0000388Extension Modules
389-----------------
390
Neal Norwitz6cf49cf2008-03-24 06:22:57 +0000391- The dl module was removed, use the ctypes module instead.
392
Martin v. Löwis92fab752008-03-08 10:40:41 +0000393- Use wchar_t functions in _locale module.
Barry Warsawa9d499d2008-03-01 18:38:07 +0000394
Martin v. Löwis071ef772008-03-08 11:24:24 +0000395Library
396-------
397
Georg Brandl52b92cc2008-05-25 09:43:03 +0000398- The class distutils.commands.build_py.build_py_2to3 can be used as a
399 build_py replacement to automatically run 2to3 on modules that are
400 going to be installed.
Martin v. Löwis73a22f02008-03-22 00:35:10 +0000401
Guido van Rossumf4169812008-03-17 22:56:06 +0000402- A new pickle protocol (protocol 3) is added with explicit support
403 for bytes. This is the default protocol. It intentionally cannot
404 be unpickled by Python 2.x.
405
406- When a pickle written by Python 2.x contains an (8-bit) str
407 instance, this is now decoded to a (Unicode) str instance. The
408 encoding used to do this defaults to ASCII, but can be overridden
409 via two new keyword arguments to the Unpickler class. Previously
410 this would create bytes instances, which is usually wrong: str
411 instances are often used to pickle attribute names etc., and text is
412 more common than binary data anyway.
413
Martin v. Löwis071ef772008-03-08 11:24:24 +0000414- Default to ASCII as the locale.getpreferredencoding, if the POSIX
Georg Brandl52b92cc2008-05-25 09:43:03 +0000415 system doesn't support CODESET and LANG isn't set or doesn't allow
416 deduction of an encoding.
Martin v. Löwis071ef772008-03-08 11:24:24 +0000417
Georg Brandl52b92cc2008-05-25 09:43:03 +0000418- Issue #1202: zlib.crc32 and zlib.adler32 now return an unsigned
419 value.
Gregory P. Smith425136b2008-03-17 20:45:21 +0000420
Georg Brandl52b92cc2008-05-25 09:43:03 +0000421- Issue #719888: Updated tokenize to use a bytes API. generate_tokens
422 has been renamed tokenize and now works with bytes rather than
423 strings. A new detect_encoding function has been added for
424 determining source file encoding according to PEP-0263. Token
425 sequences returned by tokenize always start with an ENCODING token
426 which specifies the encoding used to decode the file. This token is
427 used to encode the output of untokenize back to bytes.
428
Barry Warsawa9d499d2008-03-01 18:38:07 +0000429
Christian Heimesbc873412007-12-08 22:11:32 +0000430What's New in Python 3.0a3?
431===========================
432
Barry Warsaw659fc422008-03-01 17:45:23 +0000433*Release date: 29-Feb-2008*
Christian Heimesbc873412007-12-08 22:11:32 +0000434
435Core and Builtins
436-----------------
437
Georg Brandl52b92cc2008-05-25 09:43:03 +0000438- Issue #2282: io.TextIOWrapper was not overriding seekable() from
439 io.IOBase.
Ka-Ping Yeeddaa7062008-03-17 20:35:15 +0000440
Georg Brandl52b92cc2008-05-25 09:43:03 +0000441- Issue #2115: Important speedup in setting __slot__ attributes. Also
442 prevent a possible crash: an Abstract Base Class would try to access
443 a slot on a registered virtual subclass.
Christian Heimesa156e092008-02-16 07:38:31 +0000444
Georg Brandl52b92cc2008-05-25 09:43:03 +0000445- Fixed repr() and str() of complex numbers with infinity or nan as
446 real or imaginary part.
Christian Heimesa156e092008-02-16 07:38:31 +0000447
Georg Brandl52b92cc2008-05-25 09:43:03 +0000448- Clear all free list during a gc.collect() of the highest generation
449 in order to allow pymalloc to free more arenas. Python may give back
450 memory to the OS earlier.
Christian Heimesa156e092008-02-16 07:38:31 +0000451
Georg Brandl52b92cc2008-05-25 09:43:03 +0000452- Issue #2045: Fix an infinite recursion triggered when printing a
453 subclass of collections.defaultdict, if its default_factory is set
454 to a bound method.
Christian Heimesa156e092008-02-16 07:38:31 +0000455
456- Fixed a minor memory leak in dictobject.c. The content of the free
457 list was not freed on interpreter shutdown.
458
Georg Brandl52b92cc2008-05-25 09:43:03 +0000459- Limit free list of method and builtin function objects to 256
460 entries each.
Christian Heimesa156e092008-02-16 07:38:31 +0000461
Georg Brandl52b92cc2008-05-25 09:43:03 +0000462- Patch #1953: Added ``sys._compact_freelists()`` and the C API
463 functions ``PyInt_CompactFreeList`` and ``PyFloat_CompactFreeList``
Christian Heimesa156e092008-02-16 07:38:31 +0000464 to compact the internal free lists of pre-allocted ints and floats.
465
466- Bug #1983: Fixed return type of fork(), fork1() and forkpty() calls.
Georg Brandl52b92cc2008-05-25 09:43:03 +0000467 Python expected the return type int but the fork familie returns
468 pi_t.
Christian Heimesa156e092008-02-16 07:38:31 +0000469
Georg Brandl52b92cc2008-05-25 09:43:03 +0000470- Issue #1678380: Fix a bug that identifies 0j and -0j when they
471 appear in the same code unit.
Christian Heimesa156e092008-02-16 07:38:31 +0000472
Georg Brandl52b92cc2008-05-25 09:43:03 +0000473- Issue #2025: Added tuple.count() and tuple.index() methods to comply
474 with the collections.Sequence API.
Raymond Hettinger65baa342008-02-07 00:41:02 +0000475
Georg Brandl52b92cc2008-05-25 09:43:03 +0000476- Fixed multiple reinitialization of the Python interpreter. The small
477 int list in longobject.c has caused a seg fault during the third
478 finalization.
Christian Heimesdfc12ed2008-01-31 15:16:38 +0000479
Georg Brandl52b92cc2008-05-25 09:43:03 +0000480- Issue #1973: bytes.fromhex('') raised SystemError.
Christian Heimesc04dac02008-01-30 11:27:57 +0000481
Georg Brandl52b92cc2008-05-25 09:43:03 +0000482- Issue #1771: remove cmp parameter from sorted() and list.sort().
Raymond Hettinger70b64fc2008-01-30 20:15:17 +0000483
Georg Brandl52b92cc2008-05-25 09:43:03 +0000484- Issue #1969: split and rsplit in bytearray are inconsistent.
Christian Heimes7b876152008-01-30 09:51:48 +0000485
Georg Brandl52b92cc2008-05-25 09:43:03 +0000486- map() no longer accepts None for the first argument. Use zip()
487 instead.
Raymond Hettinger1dfde1d2008-01-22 23:25:35 +0000488
Facundo Batista2336bdd2008-01-19 19:12:01 +0000489- Issue #1769: Now int("- 1") is not allowed any more.
490
Georg Brandl52b92cc2008-05-25 09:43:03 +0000491- Object/longobject.c: long(float('nan')) raises an OverflowError
492 instead of returning 0.
Christian Heimes386cd1e2008-01-15 02:01:20 +0000493
Georg Brandl52b92cc2008-05-25 09:43:03 +0000494- Issue #1762972: __file__ points to the source file instead of the
495 pyc/pyo file if the py file exists.
Christian Heimes3b06e532008-01-07 20:12:44 +0000496
Guido van Rossumab078dd2008-01-06 00:09:11 +0000497- Issue #1393: object_richcompare() returns NotImplemented instead of
498 False if the objects aren't equal, to give the other side a chance.
499
Guido van Rossume239b002008-01-06 00:44:20 +0000500- Issue #1692: Interpreter was not displaying location of SyntaxError.
Kurt B. Kaiser43b15092008-01-05 04:32:22 +0000501
Georg Brandl52b92cc2008-05-25 09:43:03 +0000502- Improve some exception messages when Windows fails to load an
503 extension module. Now we get for example '%1 is not a valid Win32
504 application' instead of 'error code 193'. Also use Unicode strings
505 to deal with non-English locales.
Amaury Forgeot d'Arcbccd63c2008-01-04 01:21:27 +0000506
Georg Brandl52b92cc2008-05-25 09:43:03 +0000507- Issue #1587: Added instancemethod wrapper for PyCFunctions. The
508 Python C API has gained a new type *PyInstanceMethod_Type* and the
509 functions *PyInstanceMethod_Check(o)*, *PyInstanceMethod_New(func)*
510 and *PyInstanceMethod_Function(im)*.
Christian Heimesa3534a62007-12-11 19:56:40 +0000511
Georg Brandl52b92cc2008-05-25 09:43:03 +0000512- Constants gc.DEBUG_OBJECT and gc.DEBUG_INSTANCE have been removed
513 from the gc module; gc.DEBUG_COLLECTABLE or gc.DEBUG_UNCOLLECTABLE
514 are now enough to print the corresponding list of objects considered
515 by the garbage collector.
Amaury Forgeot d'Arcad8dcd52007-12-10 23:58:35 +0000516
Georg Brandl52b92cc2008-05-25 09:43:03 +0000517- Issue #1573: Improper use of the keyword-only syntax makes the
518 parser crash.
Christian Heimesbc873412007-12-08 22:11:32 +0000519
Georg Brandl52b92cc2008-05-25 09:43:03 +0000520- Issue #1564: The set implementation should special-case PyUnicode
521 instead of PyString.
Christian Heimes0ded5b52007-12-10 15:50:56 +0000522
Guido van Rossumea6775b2008-02-21 20:16:31 +0000523- Patch #1031213: Decode source line in SyntaxErrors back to its
524 original source encoding.
Christian Heimes7131fd92008-02-19 14:21:46 +0000525
Christian Heimes09aaa882008-02-23 15:01:06 +0000526- inspect.getsource() includes the decorators again.
527
Guido van Rossumea6775b2008-02-21 20:16:31 +0000528- Bug #1713: posixpath.ismount() claims symlink to a mountpoint is a
529 mountpoint.
Christian Heimes7131fd92008-02-19 14:21:46 +0000530
Georg Brandl52b92cc2008-05-25 09:43:03 +0000531- Fix utf-8-sig incremental decoder, which didn't recognise a BOM when
532 the first chunk fed to the decoder started with a BOM, but was
533 longer than 3 bytes.
Christian Heimes7131fd92008-02-19 14:21:46 +0000534
Christian Heimesbc873412007-12-08 22:11:32 +0000535Extension Modules
536-----------------
537
Georg Brandl52b92cc2008-05-25 09:43:03 +0000538- Code for itertools ifilter(), imap(), and izip() moved to bultins
539 and renamed to filter(), map(), and zip(). Also, renamed
540 izip_longest() to zip_longest() and ifilterfalse() to filterfalse().
Raymond Hettinger736c0ab2008-03-13 02:09:15 +0000541
Georg Brandl52b92cc2008-05-25 09:43:03 +0000542- Issue #1762972: Readded the reload() function as imp.reload().
Guido van Rossumea6775b2008-02-21 20:16:31 +0000543
Georg Brandl52b92cc2008-05-25 09:43:03 +0000544- Bug #2111: mmap segfaults when trying to write a block opened with
545 PROT_READ.
Christian Heimesa156e092008-02-16 07:38:31 +0000546
Georg Brandl52b92cc2008-05-25 09:43:03 +0000547- Issue #2063: correct order of utime and stime in os.times() result
548 on Windows.
Christian Heimes7131fd92008-02-19 14:21:46 +0000549
Christian Heimesbc873412007-12-08 22:11:32 +0000550Library
551-------
552
Raymond Hettinger48b8b662008-02-05 01:53:00 +0000553- Weakref dictionaries now inherit from MutableMapping.
Raymond Hettinger48b8b662008-02-05 01:53:00 +0000554
Georg Brandl52b92cc2008-05-25 09:43:03 +0000555- Created new UserDict class in collections module. This one inherits
556 from and complies with the MutableMapping ABC. Also, moved
557 UserString and UserList to the collections module. The
558 MutableUserString class was removed.
Raymond Hettinger48b8b662008-02-05 01:53:00 +0000559
Guido van Rossumea6775b2008-02-21 20:16:31 +0000560- Removed UserDict.DictMixin. Replaced all its uses with
561 collections.MutableMapping.
Raymond Hettingeredf3b732008-02-04 22:07:15 +0000562
Guido van Rossume239b002008-01-06 00:44:20 +0000563- Issue #1703: getpass() should flush after writing prompt.
Christian Heimesfc5aa9d2007-12-11 09:00:01 +0000564
Guido van Rossume239b002008-01-06 00:44:20 +0000565- Issue #1585: IDLE uses non-existent xrange() function.
566
567- Issue #1578: Problems in win_getpass.
568
Georg Brandl52d168a2008-01-07 18:10:24 +0000569Build
570-----
571
Georg Brandl52b92cc2008-05-25 09:43:03 +0000572- Renamed --enable-unicode configure flag to --with-wide-unicode,
573 since Unicode strings can't be disabled anymore.
Georg Brandl52d168a2008-01-07 18:10:24 +0000574
Guido van Rossume239b002008-01-06 00:44:20 +0000575C API
576-----
577
578- Issue #1629: Renamed Py_Size, Py_Type and Py_Refcnt to Py_SIZE,
579 Py_TYPE and Py_REFCNT.
580
Georg Brandl52b92cc2008-05-25 09:43:03 +0000581- New API PyImport_ImportModuleNoBlock(), works like
582 PyImport_ImportModule() but won't block on the import lock
583 (returning an error instead).
Christian Heimes0ec88b32007-12-10 17:02:00 +0000584
Christian Heimesbc873412007-12-08 22:11:32 +0000585
Fred Drake0e474a82007-10-11 18:01:43 +0000586What's New in Python 3.0a2?
Christian Heimesbc873412007-12-08 22:11:32 +0000587===========================
Fred Drake0e474a82007-10-11 18:01:43 +0000588
Guido van Rossum99533a92007-12-06 05:07:41 +0000589*Release date: 07-Dec-2007*
590
591(Note: this list is incomplete.)
Fred Drake0e474a82007-10-11 18:01:43 +0000592
Guido van Rossum40d20bc2007-10-22 00:09:51 +0000593Core and Builtins
594-----------------
595
Brett Cannon37f7e6e2007-10-26 05:42:09 +0000596- str8 now has the same construction signature as bytes.
597
Georg Brandl52b92cc2008-05-25 09:43:03 +0000598- Comparisons between str and str8 now return False/True for ==/!=.
599 sqlite3 returns str8 when recreating on object from it's __conform__
600 value. The struct module returns str8 for all string-related
601 formats. This was true before this change, but becomes more
602 apparent thanks to string comparisons always being False.
Brett Cannon40430012007-10-22 20:24:51 +0000603
Georg Brandl52b92cc2008-05-25 09:43:03 +0000604- Replaced `PyFile_FromFile()` with `PyFile_FromFd(fd, name. mode,
605 buffer, encoding, newline)`.
Guido van Rossum40d20bc2007-10-22 00:09:51 +0000606
607- Fixed `imp.find_module()` to obey the -*- coding: -*- header.
608
609- Changed `__file__` and `co_filename` to unicode. The path names are decoded
Antoine Pitrou6e1df8d2008-07-25 19:58:18 +0000610 with `Py_FileSystemDefaultEncoding` and a new API method
Guido van Rossum40d20bc2007-10-22 00:09:51 +0000611 `PyUnicode_DecodeFSDefault(char*)` was added.
612
Georg Brandl52b92cc2008-05-25 09:43:03 +0000613- io.open() and _fileio.FileIO have grown a new argument closefd. A
614 false value disables the closing of the file descriptor.
Guido van Rossum2dced8b2007-10-30 17:27:30 +0000615
Georg Brandl52b92cc2008-05-25 09:43:03 +0000616- Added a new option -b to issues warnings (-bb for errors) about
617 certain operations between bytes/buffer and str like str(b'') and
618 comparison.
Guido van Rossum98297ee2007-11-06 21:34:58 +0000619
Georg Brandl52b92cc2008-05-25 09:43:03 +0000620- The standards streams sys.stdin, stdout and stderr may be None when
621 the when the C runtime library returns an invalid file descriptor
622 for the streams (fileno(stdin) < 0). For now this happens only for
623 Windows GUI apps and scripts started with `pythonw.exe`.
Christian Heimes58cb1b82007-11-13 02:19:40 +0000624
Christian Heimesbce52be2007-11-17 19:08:41 +0000625- Added PCbuild9 directory for VS 2008.
626
Georg Brandl52b92cc2008-05-25 09:43:03 +0000627- Renamed structmember.h WRITE_RESTRICTED to PY_WRITE_RESTRICTED to
628 work around a name clash with VS 2008 on Windows.
Christian Heimesbce52be2007-11-17 19:08:41 +0000629
Georg Brandl52b92cc2008-05-25 09:43:03 +0000630- Unbound methods are gone for good. ClassObject.method returns an
631 ordinary function object, instance.method still returns a bound
632 method object. The API of bound methods is cleaned up, too. The
633 im_class attribute is removed and im_func + im_self are renamed to
634 __func__ and __self__. The factory PyMethod_New takes only func and
635 instance as argument.
Christian Heimesff737952007-11-27 10:40:20 +0000636
Georg Brandl52b92cc2008-05-25 09:43:03 +0000637- intobject.h is no longer included by Python.h. The remains were
638 moved to longobject.h. It still exists to define several aliases
639 from PyInt_ to PyLong_ functions.
Christian Heimesf78b1c62007-12-02 16:52:32 +0000640
Christian Heimesa37d4c62007-12-04 23:02:19 +0000641- Removed sys.maxint, use sys.maxsize instead.
642
Fred Drake0e474a82007-10-11 18:01:43 +0000643Extension Modules
644-----------------
645
646- The `hotshot` profiler has been removed; use `cProfile` instead.
647
Brett Cannone9fd2312007-10-12 19:18:19 +0000648Library
649-------
650
Georg Brandl52b92cc2008-05-25 09:43:03 +0000651- When loading an external file using testfile(), the passed-in
652 encoding argument was being ignored if __loader__ is defined and
653 forcing the source to be UTF-8.
Brett Cannone9fd2312007-10-12 19:18:19 +0000654
Georg Brandl52b92cc2008-05-25 09:43:03 +0000655- The methods `os.tmpnam()`, `os.tempnam()` and `os.tmpfile()` have
656 been removed in favor of the tempfile module.
Guido van Rossum687b9c02007-10-25 23:18:51 +0000657
Christian Heimesc9543e42007-11-28 08:28:28 +0000658- Removed the 'new' module.
659
Georg Brandl52b92cc2008-05-25 09:43:03 +0000660- Removed all types from the 'types' module that are easily accessable
661 through builtins.
Brett Cannone9fd2312007-10-12 19:18:19 +0000662
Georg Brandl52d168a2008-01-07 18:10:24 +0000663
Guido van Rossum4405cf32007-08-30 17:16:55 +0000664What's New in Python 3.0a1?
Guido van Rossum45aecf42006-03-15 04:58:47 +0000665==========================
Thomas Wouters4d70c3d2006-06-08 14:42:34 +0000666
Guido van Rossum4405cf32007-08-30 17:16:55 +0000667*Release date: 31-Aug-2007*
Neal Norwitz4886cc32006-08-21 17:06:07 +0000668
669Core and Builtins
670-----------------
671
Martin v. Löwis47383402007-08-15 07:32:56 +0000672- PEP 3131: Support non-ASCII identifiers.
673
Martin v. Löwis447d33e2007-07-29 18:10:01 +0000674- PEP 3120: Change default encoding to UTF-8.
675
Martin v. Löwis9f2e3462007-07-21 17:22:18 +0000676- PEP 3123: Use proper C inheritance for PyObject.
677
Guido van Rossumcd16bf62007-06-13 18:07:49 +0000678- Removed the __oct__ and __hex__ special methods and added a bin()
679 builtin function.
680
Georg Brandl52b92cc2008-05-25 09:43:03 +0000681- PEP 3127: octal literals now start with "0o". Old-style octal
682 literals are invalid. There are binary literals with a prefix of
683 "0b". This also affects int(x, 0).
Guido van Rossumcd16bf62007-06-13 18:07:49 +0000684
Guido van Rossume7ba4952007-06-06 23:52:48 +0000685- None, True, False are now keywords.
686
Guido van Rossum29478ef2007-05-29 00:39:44 +0000687- PEP 3119: isinstance() and issubclass() can be overridden.
688
Guido van Rossumebe3e162007-05-17 18:20:34 +0000689- Remove BaseException.message.
690
Guido van Rossum1bc535d2007-05-15 18:46:22 +0000691- Remove tuple parameter unpacking (PEP 3113).
692
Georg Brandl52b92cc2008-05-25 09:43:03 +0000693- Remove the f_restricted attribute from frames. This naturally leads
694 to the removal of PyEval_GetRestricted() and PyFrame_IsRestricted().
Guido van Rossuma8add0e2007-05-14 22:03:55 +0000695
Georg Brandl52b92cc2008-05-25 09:43:03 +0000696- PEP 3132 was accepted. That means that you can do ``a, *b =
697 range(5)`` to assign 0 to a and [1, 2, 3, 4] to b.
Guido van Rossum0368b722007-05-11 16:50:42 +0000698
Georg Brandl52b92cc2008-05-25 09:43:03 +0000699- range() now returns an iterator rather than a list. Floats are not
700 allowed. xrange() is no longer defined.
Guido van Rossum805365e2007-05-07 22:24:25 +0000701
Nick Coghlan650f0d02007-04-15 12:05:43 +0000702- Patch #1660500: hide iteration variable in list comps, add set comps
Georg Brandl52b92cc2008-05-25 09:43:03 +0000703 and use common code to handle compilation of iterative expressions.
Nick Coghlan650f0d02007-04-15 12:05:43 +0000704
Guido van Rossume27dc722007-03-27 22:37:34 +0000705- By default, != returns the opposite of ==, unless the latter returns
706 NotImplemented.
707
Georg Brandl52b92cc2008-05-25 09:43:03 +0000708- Patch #1680961: sys.exitfunc has been removed and replaced with a
709 private C-level API.
Collin Winter670e6922007-03-21 02:57:17 +0000710
Georg Brandl801dd732007-03-18 20:18:31 +0000711- PEP 3115: new metaclasses: the metaclass is now specified as a
Georg Brandl52b92cc2008-05-25 09:43:03 +0000712 keyword arg in the class statement, which can now use the full
713 syntax of a parameter list. Also, the metaclass can implement a
714 __prepare__ function which will be called to create the dictionary
715 for the new class namespace.
Georg Brandl801dd732007-03-18 20:18:31 +0000716
Georg Brandl428f0642007-03-18 18:35:15 +0000717- The long-deprecated argument "pend" of PyFloat_FromString() has been
718 removed.
719
Georg Brandle32b4222007-03-10 22:13:27 +0000720- The dir() function has been extended to call the __dir__() method on
Georg Brandl52b92cc2008-05-25 09:43:03 +0000721 its argument, if it exists. If not, it will work like before. This
722 allows customizing the output of dir() in the presence of a
723 __getattr__().
Brett Cannonba7bf492007-02-27 00:15:55 +0000724
Neal Norwitz8dfc4a92007-08-11 06:39:53 +0000725- Removed support for __members__ and __methods__.
726
Georg Brandle32b4222007-03-10 22:13:27 +0000727- Removed indexing/slicing on BaseException.
Neal Norwitz2633c692007-02-26 22:22:47 +0000728
Georg Brandle32b4222007-03-10 22:13:27 +0000729- input() became raw_input(): the name input() now implements the
Georg Brandl52b92cc2008-05-25 09:43:03 +0000730 functionality formerly known as raw_input(); the name raw_input() is
731 no longer defined.
Guido van Rossum0240b922007-02-26 21:23:50 +0000732
Georg Brandl52b92cc2008-05-25 09:43:03 +0000733- Classes listed in an 'except' clause must inherit from
734 BaseException.
Brett Cannonf74225d2007-02-26 21:10:16 +0000735
Guido van Rossumcc2b0162007-02-11 06:12:03 +0000736- PEP 3106: dict.iterkeys(), .iteritems(), .itervalues() are now gone;
Guido van Rossumcf1be882007-08-30 22:07:17 +0000737 and .keys(), .items(), .values() return dict views, which behave
738 like sets.
Guido van Rossumcc2b0162007-02-11 06:12:03 +0000739
Guido van Rossum8b545362007-02-09 23:52:14 +0000740- PEP 3105: print is now a function. Also (not in the PEP) the
Georg Brandl52b92cc2008-05-25 09:43:03 +0000741 'softspace' attribute of files is now gone (since print() doesn't
742 use it). A side effect of this change is that you can get
743 incomplete output lines in interactive sessions:
Guido van Rossum8b545362007-02-09 23:52:14 +0000744
745 >>> print(42, end="")
Kurt B. Kaiser2c7f3142007-08-30 21:52:19 +0000746 42>>>
Guido van Rossum8b545362007-02-09 23:52:14 +0000747
748 We may be able to fix this after the I/O library rewrite.
Guido van Rossum4502c802007-02-09 05:42:38 +0000749
Brett Cannon398db8b2007-01-29 23:44:37 +0000750- PEP 3102: keyword-only arguments.
751
Georg Brandl52b92cc2008-05-25 09:43:03 +0000752- Int/Long unification is complete. The 'long' built-in type and
753 literals with trailing 'L' or 'l' have been removed. Performance
754 may be sub-optimal (haven't really benchmarked).
Guido van Rossumab186842007-01-14 03:42:30 +0000755
756- 'except E, V' must now be spelled as 'except E as V' and deletes V
757 at the end of the except clause; V must be a simple name.
758
Neal Norwitzc1505362006-12-28 06:47:50 +0000759- Added function annotations per PEP 3107.
760
Georg Brandl52b92cc2008-05-25 09:43:03 +0000761- Added nonlocal declaration from PEP 3104:
Jeremy Hyltona4f9fc62007-02-27 15:53:28 +0000762
763 >>> def f(x):
764 ... def inc():
765 ... nonlocal x
766 ... x += 1
767 ... return x
768 ... return inc
769 ...
770 >>> inc = f(0)
771 >>> inc()
772 1
773 >>> inc()
774 2
775
Georg Brandl66a796e2006-12-19 20:50:34 +0000776- Moved intern() to sys.intern().
777
778- exec is now a function.
779
780- Renamed nb_nonzero to nb_bool and __nonzero__ to __bool__.
Jack Diederich4dafcc42006-11-28 19:15:13 +0000781
Neal Norwitz4886cc32006-08-21 17:06:07 +0000782- Classic classes are a thing of the past. All classes are new style.
783
784- Exceptions *must* derive from BaseException.
785
786- Integer division always returns a float. The -Q option is no more.
787 All the following are gone:
788 * PyNumber_Divide and PyNumber_InPlaceDivide
789 * __div__, __rdiv__, and __idiv__
790 * nb_divide, nb_inplace_divide
791 * operator.div, operator.idiv, operator.__div__, operator.__idiv__
792 (Only __truediv__ and __floordiv__ remain, not sure how to handle them
793 if we want to re-use __div__ and friends. If we do, it will make
794 it harder to write code for both 2.x and 3.x.)
795
796- 'as' and 'with' are keywords.
797
798- Absolute import is the default behavior for 'import foo' etc.
799
Georg Brandl52b92cc2008-05-25 09:43:03 +0000800- Removed support for syntax: backticks (ie, `x`), <>.
Neal Norwitz378b2c92006-08-29 07:57:22 +0000801
Georg Brandl52b92cc2008-05-25 09:43:03 +0000802- Removed these Python builtins: apply(), callable(), coerce(),
803 execfile(), file(), reduce(), reload().
Neal Norwitz4886cc32006-08-21 17:06:07 +0000804
Georg Brandl52b92cc2008-05-25 09:43:03 +0000805- Removed these Python methods: {}.has_key.
Neal Norwitz378b2c92006-08-29 07:57:22 +0000806
Georg Brandl52b92cc2008-05-25 09:43:03 +0000807- Removed these opcodes: BINARY_DIVIDE, INPLACE_DIVIDE, UNARY_CONVERT.
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000808
809- Remove C API support for restricted execution.
810
Guido van Rossumcf1be882007-08-30 22:07:17 +0000811- zip(), map() and filter() now return iterators, behaving like their
Georg Brandl52b92cc2008-05-25 09:43:03 +0000812 itertools counterparts. This also affect map()'s behavior on
Guido van Rossumcf1be882007-08-30 22:07:17 +0000813 sequences of unequal length -- it now stops after the shortest one
814 is exhausted.
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000815
Georg Brandl52b92cc2008-05-25 09:43:03 +0000816- Additions: set literals, set comprehensions, ellipsis literal.
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000817
818- Added class decorators per PEP 3129.
819
820
821Extension Modules
822-----------------
823
Georg Brandl52b92cc2008-05-25 09:43:03 +0000824- Removed the imageop module. Obsolete long with its unit tests
825 becoming useless from the removal of rgbimg and imgfile.
Neal Norwitz4886cc32006-08-21 17:06:07 +0000826
Georg Brandl52b92cc2008-05-25 09:43:03 +0000827- Removed these attributes from the operator module: div, idiv,
828 __div__, __idiv__, isCallable, sequenceIncludes.
829
830- Removed these attributes from the sys module: exc_clear(), exc_type,
831 exc_value, exc_traceback.
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000832
833
834Library
835-------
836
Georg Brandl52b92cc2008-05-25 09:43:03 +0000837- Removed the compiler package. Use of the _ast module and (an
838 eventual) AST -> bytecode mechanism.
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000839
Georg Brandl52b92cc2008-05-25 09:43:03 +0000840- Removed these modules: audiodev, Bastion, bsddb185, exceptions,
841 linuxaudiodev, md5, MimeWriter, mimify, popen2, rexec, sets, sha,
842 stringold, strop, sunaudiodev, timing, xmllib.
Guido van Rossum33d26892007-08-05 15:29:28 +0000843
Georg Brandl52b92cc2008-05-25 09:43:03 +0000844- Moved the toaiff module to Tools/Demos.
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000845
Georg Brandl52b92cc2008-05-25 09:43:03 +0000846- Removed obsolete IRIX modules: al/AL, cd/CD, cddb, cdplayer, cl/CL,
847 DEVICE, ERRNO, FILE, fl/FL, flp, fm, GET, gl/GL, GLWS, IN, imgfile,
848 IOCTL, jpeg, panel, panelparser, readcd, sgi, sv/SV, torgb, WAIT.
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000849
Georg Brandl52b92cc2008-05-25 09:43:03 +0000850- Removed obsolete functions: commands.getstatus(), os.popen*().
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000851
Georg Brandl52b92cc2008-05-25 09:43:03 +0000852- Removed functions in the string module that are also string methods;
Martin v. Löwis967f1e32007-08-14 09:23:10 +0000853 Remove string.{letters, lowercase, uppercase}.
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000854
Georg Brandl52b92cc2008-05-25 09:43:03 +0000855- Removed support for long obsolete platforms: plat-aix3, plat-irix5.
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000856
Georg Brandl52b92cc2008-05-25 09:43:03 +0000857- Removed xmlrpclib.SlowParser. It was based on xmllib.
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000858
859- Patch #1680961: atexit has been reimplemented in C.
860
Walter Dörwald41980ca2007-08-16 21:55:45 +0000861- Add new codecs for UTF-32, UTF-32-LE and UTF-32-BE.
862
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000863Build
864-----
865
866C API
867-----
868
Georg Brandl52b92cc2008-05-25 09:43:03 +0000869- Removed these Python slots: __coerce__, __div__, __idiv__, __rdiv__.
Neal Norwitz4886cc32006-08-21 17:06:07 +0000870
Georg Brandl52b92cc2008-05-25 09:43:03 +0000871- Removed these C APIs: PyNumber_Coerce(), PyNumber_CoerceEx(),
872 PyMember_Get, PyMember_Set.
Neal Norwitz4886cc32006-08-21 17:06:07 +0000873
Georg Brandl52b92cc2008-05-25 09:43:03 +0000874- Removed these C slots/fields: nb_divide, nb_inplace_divide.
Neal Norwitz4886cc32006-08-21 17:06:07 +0000875
Georg Brandl52b92cc2008-05-25 09:43:03 +0000876- Removed these macros: staticforward, statichere, PyArg_GetInt,
877 PyArg_NoArgs, _PyObject_Del.
Neal Norwitz4886cc32006-08-21 17:06:07 +0000878
Georg Brandl52b92cc2008-05-25 09:43:03 +0000879- Removed these typedefs: intargfunc, intintargfunc, intobjargproc,
880 intintobjargproc, getreadbufferproc, getwritebufferproc,
881 getsegcountproc, getcharbufferproc, memberlist.
Raymond Hettinger4901a1f2004-12-02 08:59:14 +0000882
Raymond Hettinger4901a1f2004-12-02 08:59:14 +0000883Tests
884-----
885
Brett Cannone7a30f72008-03-03 03:36:27 +0000886- Removed test.testall as test.regrtest replaces it.
887
Brett Cannonced04e02005-02-13 22:53:22 +0000888Documentation
889-------------
890
Raymond Hettinger4901a1f2004-12-02 08:59:14 +0000891Mac
892---
893
Georg Brandl52b92cc2008-05-25 09:43:03 +0000894- The cfmfile module was removed.
Guido van Rossume7ba4952007-06-06 23:52:48 +0000895
Guido van Rossum845702c2007-08-30 18:44:53 +0000896Platforms
897---------
898
899- Support for BeOS and AtheOS was removed (according to PEP 11).
900
901- Support for RiscOS, Irix, Tru64 was removed (alledgedly).
902
Raymond Hettinger4901a1f2004-12-02 08:59:14 +0000903Tools/Demos
904-----------
905
Georg Brandl52b92cc2008-05-25 09:43:03 +0000906
Skip Montanaroe5d7f7f2002-09-20 14:16:59 +0000907**(For information about older versions, consult the HISTORY file.)**