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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
Barry Warsaw8509df72008-08-21 03:02:47 +00007What's New in Python 3.0 release candidate 1
8============================================
9
10*Release date: XX-XXXX-2008*
11
12Core and Builtins
13-----------------
14
Amaury Forgeot d'Arcdb26f7c2008-08-29 07:13:32 +000015- Issue #3611: An exception __context__ could be cleared in a complex pattern
16 involving a __del__ method re-raising an exception.
17
Antoine Pitrouec569b72008-08-26 22:40:48 +000018- Issue #2534: speed up isinstance() and issubclass() by 50-70%, so as to
19 match Python 2.5 speed despite the __instancecheck__ / __subclasscheck__
20 mechanism. In the process, fix a bug where isinstance() and issubclass(),
21 when given a tuple of classes as second argument, were looking up
22 __instancecheck__ / __subclasscheck__ on the tuple rather than on each
23 type object.
24
Antoine Pitroue2dffc02008-08-26 22:02:58 +000025- Issue #3663: Py_None was decref'd when printing SyntaxErrors.
26
Benjamin Peterson9edd2bd2008-08-27 00:31:37 +000027- Issue #3651: Fix various memory leaks when using the buffer
28 interface, or when the "s#" code of PyArg_ParseTuple is given a
29 bytes object.
30
Neal Norwitz6ae2eb22008-08-24 23:50:08 +000031- Issue #3657: Fix uninitialized memory read when pickling longs.
32 Found by valgrind.
33
Neal Norwitz3ce5d922008-08-24 07:08:55 +000034- Apply security patches from Apple.
35
Neal Norwitz2f99b242008-08-24 05:48:10 +000036- Fix crashes on memory allocation failure found with failmalloc.
37
38- Fix memory leaks found with valgrind and update suppressions file.
39
40- Fix compiler warnings in opt mode which would lead to invalid memory reads.
41
42- Fix problem using wrong name in decimal module reported by pychecker.
43
Amaury Forgeot d'Arc20443f32008-08-22 22:05:20 +000044- Issue #3650: Fixed a reference leak in bytes.split('x').
45
Benjamin Petersonc15a0732008-08-26 16:46:47 +000046- bytes(o) now tries to use o.__bytes__() before using fallbacks.
47
48C API
49-----
50
51- PyObject_Bytes and PyBytes_FromObject were added.
52
Barry Warsaw8509df72008-08-21 03:02:47 +000053Library
54-------
55
Benjamin Peterson6784eb72008-08-23 20:32:27 +000056Extension Modules
57-----------------
58
59- Issue #3643: Added a few more checks to _testcapi to prevent segfaults by
60 exploitation of poor argument checking.
61
Neal Norwitz8f2f22a2008-08-24 20:59:23 +000062Tools/Demos
63-----------
64
65- Fix Misc/gdbinit so it works.
66
Barry Warsaw8509df72008-08-21 03:02:47 +000067
Antoine Pitrou6e1df8d2008-07-25 19:58:18 +000068What's new in Python 3.0b3?
69===========================
70
Barry Warsaw57c10582008-08-21 02:39:51 +000071*Release date: 20-Aug-2008*
Antoine Pitrou6e1df8d2008-07-25 19:58:18 +000072
Antoine Pitrou9a2310d2008-07-25 22:39:39 +000073Core and Builtins
74-----------------
75
Benjamin Petersonbc74e5b2008-08-23 20:19:17 +000076- Issue #3653: Fix a segfault when sys.excepthook was called with invalid
77 arguments.
78
Antoine Pitrou616d2852008-08-19 22:09:34 +000079- Issue #2394: implement more of the memoryview API, with the caveat that
80 only one-dimensional contiguous buffers are supported and exercised right
81 now. Slicing, slice assignment and comparison (equality and inequality)
82 have been added. Also, the tolist() method has been implemented, but only
83 for byte buffers. Endly, the API has been updated to return bytes objects
84 wherever it used to return bytearrays.
85
Antoine Pitrouee58fa42008-08-19 18:22:14 +000086- Issue #3560: clean up the new C PyMemoryView API so that naming is
87 internally consistent; add macros PyMemoryView_GET_BASE() and
88 PyMemoryView_GET_BUFFER() to access useful properties of a memory views
89 without relying on a particular implementation; remove the ill-named
90 PyMemoryView() function (PyMemoryView_GET_BUFFER() can be used instead).
91
Thomas Hellerf5049fc2008-08-19 19:49:49 +000092- ctypes function pointers that are COM methods have a boolean True
93 value again.
94
Antoine Pitrou9a2310d2008-07-25 22:39:39 +000095- Issue #1819: function calls with several named parameters are now on
96 average 35% faster (as measured by pybench).
97
Marc-André Lemburg4cc0f242008-08-07 18:54:33 +000098- The undocumented C APIs PyUnicode_AsString() and
99 PyUnicode_AsStringAndSize() were made private to the interpreter, in
100 order to be able to refine their interfaces for Python 3.1.
101
102 If you need to access the UTF-8 representation of a Unicode object
103 as bytes string, please use PyUnicode_AsUTF8String() instead.
104
Antoine Pitrouaf14b792008-08-07 21:50:41 +0000105- Issue #3460: PyUnicode_Join() implementation is 10% to 80% faster thanks
106 to Python 3.0's stricter semantics which allow to avoid successive
107 reallocations of the result string (this also affects str.join()).
108
Marc-André Lemburg4cc0f242008-08-07 18:54:33 +0000109
Antoine Pitrou6e1df8d2008-07-25 19:58:18 +0000110Library
111-------
112
Hye-Shik Chang50d1f792008-08-23 08:03:03 +0000113- Issue #1276: Added temporary aliases for CJK Mac encodings to resolve
114 a build problem on MacOS with CJK locales. It adds four temporary
115 mappings to existing legacy codecs that are virtually compatible
116 with Mac encodings. They will be replaced by codecs correctly
117 implemented in 3.1.
118
Amaury Forgeot d'Arc41e36672008-08-20 21:35:50 +0000119- Issue #3614: Corrected a typo in xmlrpc.client, leading to a NameError
120 "global name 'header' is not defined".
121
Antoine Pitroufd036452008-08-19 17:56:33 +0000122- Issue #2834: update the regular expression library to match the unicode
123 standards of py3k. In other words, mixing bytes and unicode strings
124 (be it as pattern, search string or replacement string) raises a TypeError.
125 Moreover, the re.UNICODE flag is enabled automatically for unicode patterns,
126 and can be disabled by specifying a new re.ASCII flag; as for bytes
127 patterns, ASCII matching is the only option and trying to specify re.UNICODE
128 for such patterns raises a ValueError.
129
Guido van Rossum52dbbb92008-08-18 21:44:30 +0000130- Issue #3300: make urllib.parse.[un]quote() default to UTF-8.
131 Code contributed by Matt Giuca. quote() now encodes the input
132 before quoting, unquote() decodes after unquoting. There are
133 new arguments to change the encoding and errors settings.
134 There are also new APIs to skip the encode/decode steps.
135 [un]quote_plus() are also affected.
136
Nick Coghlan36f49522008-08-18 12:31:52 +0000137- Issue #2235: numbers.Number now blocks inheritance of the default id()
138 based hash because that hash mechanism is not correct for numeric types.
139 All concrete numeric types that inherit from Number (rather than just
140 registering with it) must explicitly provide a hash implementation in
141 order for their instances to be hashable.
142
Benjamin Peterson4cd6a952008-08-17 20:23:46 +0000143- Issue #2676: in the email package, content-type parsing was hanging on
144 pathological input because of quadratic or exponential behaviour of a
145 regular expression.
146
Antoine Pitrou87695762008-08-14 22:44:29 +0000147- Issue #3476: binary buffered reading through the new "io" library is now
148 thread-safe.
149
Robert Schuppenies3d1c7de2008-08-10 11:28:17 +0000150- Issue #1342811: Fix leak in Tkinter.Menu.delete. Commands associated to
151 menu entries were not deleted.
152
Lars Gustäbel0c24e8b2008-08-02 11:43:24 +0000153- Remove the TarFileCompat class from tarfile.py.
154
Amaury Forgeot d'Arcbdbddf82008-08-01 00:06:49 +0000155- Issue #2491: os.fdopen is now almost an alias for the built-in open(), and
156 accepts the same parameters. It just checks that its first argument is an
157 integer.
158
Antoine Pitrou6e1df8d2008-07-25 19:58:18 +0000159- Issue #3394: zipfile.writestr sets external attributes when passed a
160 file name rather than a ZipInfo instance, so files are extracted with
161 mode 0600 rather than 000 under Unix.
162
Antoine Pitrouc66f9092008-07-28 19:46:11 +0000163- Issue #2523: Fix quadratic behaviour when read()ing a binary file without
164 asking for a specific length.
Antoine Pitrou6e1df8d2008-07-25 19:58:18 +0000165
Martin v. Löwis371bb502008-08-16 13:02:57 +0000166Extension Modules
167-----------------
168
169- Bug #3542: Support Unicode strings in _msi module.
170
Amaury Forgeot d'Arc9196dc62008-06-19 20:54:32 +0000171What's new in Python 3.0b2?
172===========================
173
Barry Warsaw4bd1cef2008-07-18 02:28:44 +0000174*Release date: 17-Jul-2008*
Amaury Forgeot d'Arc9196dc62008-06-19 20:54:32 +0000175
176Core and Builtins
177-----------------
178
Mark Dickinson65fe25e2008-07-16 11:30:51 +0000179- Issue #3008: the float type has a new instance method 'float.hex'
180 and a new class method 'float.fromhex' to convert floating-point
181 numbers to and from hexadecimal strings, respectively.
182
Eric Smithd68af8f2008-07-16 00:15:35 +0000183- Issue #3083: Add alternate (#) formatting for bin, oct, hex output
184 for str.format(). This adds the prefix 0b, 0o, or 0x, respectively.
185
Amaury Forgeot d'Arca4db6862008-07-04 21:26:43 +0000186- Issue #3280: like chr(), the "%c" format now accepts unicode code points
187 beyond the Basic Multilingual Plane (above 0xffff) on all configurations. On
188 "narrow Unicode" builds, the result is a string of 2 code units, forming a
189 UTF-16 surrogate pair.
190
Georg Brandld52429f2008-07-04 15:55:02 +0000191- Issue #3282: str.isprintable() should return False for undefined
192 Unicode characters.
193
Martin v. Löwis029656f2008-06-30 04:06:08 +0000194- Issue #3236: Return small longs from PyLong_FromString.
195
Benjamin Petersone6528212008-07-15 15:32:09 +0000196- Exception tracebacks now support exception chaining.
197
Amaury Forgeot d'Arc9196dc62008-06-19 20:54:32 +0000198Library
199-------
200
Brett Cannonc2542e92008-07-25 18:19:20 +0000201- Removed the sunaudio module. Use sunau instead.
202
Thomas Heller47bc8092008-08-19 06:38:12 +0000203- Issue #3554: ctypes.string_at and ctypes.wstring_at did call Python
204 api functions without holding the GIL, which could lead to a fatal
205 error when they failed.
206
207- Issue #799428: Fix Tkinter.Misc._nametowidget to unwrap Tcl command objects.
208
Georg Brandl30704ea02008-07-23 15:07:12 +0000209- Removed "ast" function aliases from the parser module.
210
Thomas Heller15383a02008-07-15 19:46:52 +0000211- Issue #3313: Fixed a crash when a failed dlopen() call does not set
212 a valid dlerror() message.
213
Thomas Heller0261e1e2008-07-15 17:25:07 +0000214- Issue #3258: Fixed a crash when a ctypes POINTER type to an
215 incomplete structure was created.
216
Georg Brandl1abcbf82008-07-01 19:28:43 +0000217- Issue #2683: Fix inconsistency in subprocess.Popen.communicate(): the
218 argument now must be a bytes object in any case.
219
Amaury Forgeot d'Arc9196dc62008-06-19 20:54:32 +0000220- Issue #3145: help("modules whatever") failed when trying to load the source
221 code of every single module of the standard library, including invalid files
222 used in the test suite.
223
Georg Brandlbded4d32008-07-17 18:15:35 +0000224- The gettext library now consistently uses Unicode strings for message ids
225 and message strings, and ``ugettext()`` and the like don't exist anymore.
Benjamin Peterson801844d2008-07-14 14:32:15 +0000226
Benjamin Petersone6528212008-07-15 15:32:09 +0000227- The traceback module has been expanded to handle chained exceptions.
228
Amaury Forgeot d'Arc612f61f2008-07-02 23:02:21 +0000229C API
230-----
231
232- Issue #3247: the function Py_FindMethod was removed. Modern types should
233 use the tp_methods slot instead.
234
Benjamin Petersonde9c8692008-07-01 18:23:09 +0000235Tools/Demos
236-----------
237
Georg Brandl336341f2008-07-01 20:21:28 +0000238- The Mac/Demos directory has been removed.
Benjamin Petersonde9c8692008-07-01 18:23:09 +0000239
Georg Brandl336341f2008-07-01 20:21:28 +0000240- All of the Mac scripts have been removed (including BuildApplet.py).
Benjamin Petersonde9c8692008-07-01 18:23:09 +0000241
242
Brett Cannon0d71ee72008-05-08 18:13:40 +0000243What's new in Python 3.0b1?
244===========================
245
Barry Warsawc1e689e2008-06-19 00:35:43 +0000246*Release date: 18-Jun-2008*
Brett Cannon0d71ee72008-05-08 18:13:40 +0000247
248Core and Builtins
249-----------------
250
Brett Cannondb734912008-06-27 00:52:15 +0000251- Issue #3211: warnings.warn_explicit() did not guard against its 'registry'
252 argument being anything other than a dict or None. Also fixed a bug in error
253 handling when 'message' and 'category' were both set to None, triggering a
254 bus error.
255
Amaury Forgeot d'Arcc856c7a2008-06-16 19:50:09 +0000256- Issue #3100: Corrected a crash on deallocation of a subclassed weakref which
257 holds the last (strong) reference to its referent.
258
Georg Brandl559e5d72008-06-11 18:37:52 +0000259- Issue #2630: implement PEP 3138. repr() now returns printable
260 Unicode characters unescaped, to get an ASCII-only representation
261 of an object use ascii().
262
Amaury Forgeot d'Arcf1ca0b12008-06-11 17:40:47 +0000263- Issue #1342: On windows, Python could not start when installed in a
264 directory with non-ascii characters.
265
Martin v. Löwis1a214512008-06-11 05:26:20 +0000266- Implement PEP 3121: new module initialization and finalization API.
267
Georg Brandle1b5ac62008-06-04 13:06:58 +0000268- Removed the already-defunct ``-t`` option.
269
Amaury Forgeot d'Arc74c71f52008-05-26 21:41:42 +0000270- Issue #2957: Corrected a ValueError "recursion limit exceeded", when
271 unmarshalling many code objects, which happens when importing a
272 large .pyc file (~1000 functions).
273
Georg Brandl52b92cc2008-05-25 09:43:03 +0000274- Issue #2963: fix merging oversight that disabled method cache for
275 all types.
Georg Brandl1bcf35a2008-05-25 09:32:09 +0000276
Georg Brandlc9b09532008-05-25 09:24:38 +0000277- Issue #2964: fix a missing INCREF in instancemethod_descr_get.
278
Georg Brandl52b92cc2008-05-25 09:43:03 +0000279- Issue #2895: Don't crash when given bytes objects as keyword names.
Georg Brandld8b690f2008-05-16 17:28:50 +0000280
Georg Brandl52b92cc2008-05-25 09:43:03 +0000281- Issue #2798: When parsing arguments with PyArg_ParseTuple, the "s"
282 code now allows any unicode string and returns a utf-8 encoded
283 buffer, just like the "s#" code already does. The "z" code was
284 corrected as well.
Amaury Forgeot d'Arc07404592008-05-12 13:19:07 +0000285
Georg Brandl52b92cc2008-05-25 09:43:03 +0000286- Issue #2863: generators now have a ``gen.__name__`` attribute that
287 equals ``gen.gi_code.co_name``, like ``func.__name___`` that equals
288 ``func.func_code.co_name``. The repr() of a generator now also
289 contains this name.
Alexandre Vassalottie9f305f2008-05-16 04:39:54 +0000290
291- Issue #2831: enumerate() now has a ``start`` argument.
292
Georg Brandl52b92cc2008-05-25 09:43:03 +0000293- Issue #2801: fix bug in the float.is_integer method where a
294 ValueError was sometimes incorrectly raised.
Mark Dickinsonc4352b02008-05-09 13:55:01 +0000295
Georg Brandl52b92cc2008-05-25 09:43:03 +0000296- The ``--with-toolbox-glue`` option (and the associated
297 pymactoolbox.h) have been removed.
Benjamin Peterson79629ab2008-05-14 21:07:12 +0000298
Georg Brandl52b92cc2008-05-25 09:43:03 +0000299- Issue #2196: hasattr() now lets exceptions which do not inherit
300 Exception (KeyboardInterrupt, and SystemExit) propagate instead of
301 ignoring them.
Alexandre Vassalottieca20b62008-05-16 02:54:33 +0000302
Benjamin Petersoneec3d712008-06-11 15:59:43 +0000303- #3021 Exception reraising sematics have been significantly improved. However,
304 f_exc_type, f_exc_value, and f_exc_traceback cannot be accessed from Python
305 code anymore.
306
Benjamin Peterson4f92ca42008-06-11 20:21:57 +0000307- Three of PyNumberMethods' members, nb_coerce, nb_hex, and nb_oct, have been
308 removed.
309
Brett Cannon0d71ee72008-05-08 18:13:40 +0000310Extension Modules
311-----------------
312
Georg Brandl38feaf02008-05-25 07:45:51 +0000313- Renamed ``_winreg`` module to ``winreg``.
314
Georg Brandl52b92cc2008-05-25 09:43:03 +0000315- Support os.O_ASYNC and fcntl.FASYNC if the constants exist on the
316 platform.
Alexandre Vassalottibee32532008-05-16 18:15:12 +0000317
318- Support for Windows 9x has been removed from the winsound module.
319
Georg Brandl52b92cc2008-05-25 09:43:03 +0000320- Issue #2870: cmathmodule.c compile error.
Alexandre Vassalottieca20b62008-05-16 02:54:33 +0000321
Brett Cannon0d71ee72008-05-08 18:13:40 +0000322Library
323-------
324
Benjamin Peterson87069fd2008-08-20 02:00:14 +0000325- The methods ``is_in_tuple()``, ``is_vararg()``, and ``is_keywordarg()`` of
326 symtable.Symbol have been removed.
327
Amaury Forgeot d'Arccb0d2d72008-06-18 22:19:22 +0000328- Patch #3133: http.server.CGIHTTPRequestHandler did not work on windows.
329
Jeremy Hylton1afc1692008-06-18 20:49:58 +0000330- a new ``urllib`` package was created. It consists of code from
331 ``urllib``, ``urllib2``, ``urlparse``, and ``robotparser``. The old
332 modules have all been removed. The new package has five submodules:
333 ``urllib.parse``, ``urllib.request``, ``urllib.response``,
334 ``urllib.error``, and ``urllib.robotparser``. The
335 ``urllib.request.urlopen()`` function uses the url opener from
336 ``urllib2``. (Note that the unittests have not been renamed for the
337 beta, but they will be renamed in the future.)
338
Benjamin Petersona0c0a4a2008-06-12 22:15:50 +0000339- rfc822 has been removed in favor of the email package.
340
Benjamin Peterson425ea7f2008-06-12 14:11:35 +0000341- mimetools has been removed in favor of the email package.
Benjamin Peterson23c51a22008-06-12 14:06:57 +0000342
Barry Warsawf5019422008-06-12 02:42:00 +0000343- Patch #2849: Remove use of rfc822 module from standard library.
344
Alexandre Vassalotti794652d2008-06-11 22:58:36 +0000345- Added C optimized implementation of io.StringIO.
346
Alexandre Vassalottica2d6102008-06-12 18:26:05 +0000347- The ``pickle`` module is now automatically use an optimized C
348 implementation of Pickler and Unpickler when available. The
349 ``cPickle`` module is no longer needed.
350
Georg Brandl877b10a2008-06-01 21:25:55 +0000351- Removed the ``htmllib`` and ``sgmllib`` modules.
352
Georg Brandl61013952008-05-28 15:56:30 +0000353- The deprecated ``SmartCookie`` and ``SimpleCookie`` classes have
354 been removed from ``http.cookies``.
355
Brett Cannona23810f2008-05-26 19:04:21 +0000356- The ``commands`` module has been removed. Its getoutput() and
357 getstatusoutput() functions have been moved to the ``subprocess`` module.
358
Georg Brandl3d5c4252008-05-26 18:03:26 +0000359- The ``http`` package was created; it contains the old ``httplib``
360 as ``http.client``, ``Cookie`` as ``http.cookies``, ``cookielib``
361 as ``http.cookiejar``, and the content of the three ``HTTPServer``
362 modules as ``http.server``.
363
Georg Brandl38eceaa2008-05-26 11:14:17 +0000364- The ``xmlrpc`` package was created; it contains the old
365 ``xmlrpclib`` module as ``xmlrpc.client`` and the content of
366 the old ``SimpleXMLRPCServer`` and ``DocXMLRPCServer`` modules
Antoine Pitrou6e1df8d2008-07-25 19:58:18 +0000367 as ``xmlrpc.server``.
Georg Brandl38eceaa2008-05-26 11:14:17 +0000368
369- The ``dbm`` package was created, containing the old modules
370 ``anydbm`` and ``whichdb`` in its ``__init__.py``, and having
371 ``dbm.gnu`` (was ``gdbm``), ``dbm.bsd`` (was ``dbhash``),
372 ``dbm.ndbm`` (was ``dbm``) and ``dbm.dumb`` (was ``dumbdbm``)
373 as submodules.
374
Georg Brandl52b92cc2008-05-25 09:43:03 +0000375- The ``repr`` module has been renamed to ``reprlib``.
Alexandre Vassalotti1f2ba4b2008-05-16 07:12:44 +0000376
Georg Brandl52b92cc2008-05-25 09:43:03 +0000377- The ``statvfs`` module has been removed.
Brett Cannonacbb7862008-05-16 00:42:57 +0000378
Georg Brandl52b92cc2008-05-25 09:43:03 +0000379- Issue #1713041: fix pprint's handling of maximum depth.
Alexandre Vassalottieca20b62008-05-16 02:54:33 +0000380
Georg Brandl52b92cc2008-05-25 09:43:03 +0000381- Issue #2250: Exceptions raised during evaluation of names in
382 rlcompleter's ``Completer.complete()`` method are now caught and
383 ignored.
Alexandre Vassalotti8ae3e052008-05-16 00:41:41 +0000384
Georg Brandl52b92cc2008-05-25 09:43:03 +0000385- Patch #2659: Added ``break_on_hyphens`` option to textwrap's
386 ``TextWrapper`` class.
Alexandre Vassalotti1d1eaa42008-05-14 22:59:42 +0000387
Alexandre Vassalotti6461e102008-05-15 22:09:29 +0000388- Issue #2487: change the semantics of math.ldexp(x, n) when n is too
389 large to fit in a C long. ldexp(x, n) now returns a zero (with
390 suitable sign) if n is large and negative; previously, it raised
391 OverflowError.
392
Georg Brandl52b92cc2008-05-25 09:43:03 +0000393- The ``ConfigParser`` module has been renamed to ``configparser``.
Alexandre Vassalotti5f8ced22008-05-16 00:03:33 +0000394
Georg Brandl52b92cc2008-05-25 09:43:03 +0000395- Issue #2865: webbrowser.open() works again in a KDE environment.
Amaury Forgeot d'Arc2b2b44d2008-05-12 14:41:00 +0000396
Georg Brandl52b92cc2008-05-25 09:43:03 +0000397- The ``multifile`` module has been removed.
Brett Cannond3343cb2008-05-12 03:18:21 +0000398
Georg Brandl52b92cc2008-05-25 09:43:03 +0000399- The ``SocketServer`` module has been renamed to ``socketserver``.
Alexandre Vassalottice261952008-05-12 02:31:37 +0000400
Georg Brandl52b92cc2008-05-25 09:43:03 +0000401- Fixed the ``__all__`` setting on ``collections`` to include
402 ``UserList`` and ``UserString``.
Brett Cannon23a4a7b2008-05-12 00:56:28 +0000403
Brett Cannoncf3520c2008-05-11 22:47:58 +0000404- The sre module has been removed.
405
Alexandre Vassalottif260e442008-05-11 19:59:59 +0000406- The Queue module has been renamed to queue.
407
Alexandre Vassalottif7fa63d2008-05-11 08:55:36 +0000408- The copy_reg module has been renamed to copyreg.
409
Brett Cannond8b61ee2008-05-11 03:00:26 +0000410- The mhlib module has been removed.
411
Brett Cannonbd474422008-05-10 22:42:14 +0000412- The ihooks module has been removed.
413
Brett Cannonb59a2bd2008-05-10 22:03:16 +0000414- The fpformat module has been removed.
415
Brett Cannonf4fd9932008-05-10 21:11:46 +0000416- The dircache module has been removed.
417
Brett Cannond175b4c2008-05-10 03:19:54 +0000418- The Canvas module has been removed.
419
Mark Dickinsonb27406c2008-05-09 13:42:33 +0000420- The Decimal module gained the magic methods __round__, __ceil__,
421 __floor__ and __trunc__, to give support for round, math.ceil,
422 math.floor and math.trunc.
423
Brett Cannon900ee3a2008-05-08 20:31:11 +0000424- The user module has been removed.
425
Brett Cannon34afe872008-05-08 20:31:44 +0000426- The mutex module has been removed.
427
Brett Cannon0d71ee72008-05-08 18:13:40 +0000428- The imputil module has been removed.
429
Georg Brandl52b92cc2008-05-25 09:43:03 +0000430- os.path.walk has been removed in favor of os.walk.
Benjamin Petersond71ca412008-05-08 23:44:58 +0000431
Alexandre Vassalotti5f8ced22008-05-16 00:03:33 +0000432- pdb gained the "until" command.
433
Georg Brandl52b92cc2008-05-25 09:43:03 +0000434- The test.test_support module has been renamed to test.support.
Benjamin Petersonee8712c2008-05-20 21:35:26 +0000435
Georg Brandl32de7af2008-08-18 23:07:41 +0000436- The threading module API was renamed to be PEP 8 compliant. The
437 old names are still present, but will be removed in the near future.
Benjamin Peterson672b8032008-06-11 19:14:14 +0000438
Georg Brandl294d5a92008-06-01 19:25:32 +0000439Tools/Demos
440-----------
441
442- The bgen tool has been removed.
Benjamin Peterson630c8292008-06-01 18:50:38 +0000443
Brett Cannon0d71ee72008-05-08 18:13:40 +0000444Build
445-----
446
447
Barry Warsaw66079cd2008-04-04 01:36:36 +0000448What's New in Python 3.0a5?
449===========================
450
Barry Warsaw9eab8b02008-05-08 13:05:38 +0000451*Release date: 08-May-2008*
Barry Warsaw66079cd2008-04-04 01:36:36 +0000452
453Core and Builtins
454-----------------
455
Georg Brandl52b92cc2008-05-25 09:43:03 +0000456- Fixed misbehaviour of PyLong_FromSsize_t on systems where
457 sizeof(size_t) > sizeof(long).
Mark Dickinson7ab6be22008-04-15 21:42:42 +0000458
Georg Brandl52b92cc2008-05-25 09:43:03 +0000459- Issue #2221: Corrected a SystemError "error return without exception
460 set", when the code executed by exec() raises an exception, and
461 sys.stdout.flush() also raises an error.
Amaury Forgeot d'Arc7fedbe52008-04-10 21:03:09 +0000462
Georg Brandl52b92cc2008-05-25 09:43:03 +0000463- Bug #2565: The repr() of type objects now calls them 'class', not
464 'type' - whether they are builtin types or not.
Martin v. Löwis250ad612008-04-07 05:43:42 +0000465
Martin v. Löwis790465f2008-04-05 20:41:37 +0000466- The command line processing was converted to pass Unicode strings
467 through as unmodified as possible; as a consequence, the C API
468 related to command line arguments was changed to use wchar_t.
469
Georg Brandl52b92cc2008-05-25 09:43:03 +0000470- All backslashes in raw strings are interpreted literally. This
471 means that '\u' and '\U' escapes are not treated specially.
Benjamin Petersona2f837f2008-04-28 21:05:10 +0000472
Barry Warsaw66079cd2008-04-04 01:36:36 +0000473Extension Modules
474-----------------
475
476Library
477-------
478
Georg Brandl52b92cc2008-05-25 09:43:03 +0000479- ctypes objects now support the PEP3118 buffer interface.
Thomas Hellerb041fda2008-04-30 17:11:46 +0000480
Thomas Hellere106dc32008-04-24 18:39:36 +0000481- Issue #2682: ctypes callback functions now longer contain a cyclic
482 reference to themselves.
483
Georg Brandl52b92cc2008-05-25 09:43:03 +0000484- Issue #2058: Remove the buf attribute and add __slots__ to the
485 TarInfo class in order to reduce tarfile's memory usage.
Lars Gustäbelc2ea8c62008-04-14 10:05:48 +0000486
Martin v. Löwis8efc62c2008-04-10 19:02:25 +0000487- Bug #2606: Avoid calling .sort() on a dict_keys object.
488
Thomas Hellerbff533b2008-04-04 19:53:14 +0000489- The bundled libffi copy is now in sync with the recently released
490 libffi3.0.5 version, apart from some small changes to
491 Modules/_ctypes/libffi/configure.ac.
492
Thomas Hellerf44b9a12008-04-04 10:18:23 +0000493Build
494-----
495
Mark Dickinsonb0e2b4c2008-04-26 20:48:56 +0000496- Issue #1496032: On alpha, use -mieee when gcc is the compiler.
497
Guido van Rossumdc21db32008-04-07 18:37:41 +0000498- "make install" is now an alias for "make altinstall", to prevent
Georg Brandl52b92cc2008-05-25 09:43:03 +0000499 accidentally overwriting a Python 2.x installation. Use "make
500 fullinstall" to force Python 3.0 to be installed as "python".
Guido van Rossumdc21db32008-04-07 18:37:41 +0000501
Thomas Hellerf44b9a12008-04-04 10:18:23 +0000502- Issue #2544: On HP-UX systems, use 'gcc -shared' for linking when
503 gcc is used as compiler.
Barry Warsaw66079cd2008-04-04 01:36:36 +0000504
Georg Brandl52b92cc2008-05-25 09:43:03 +0000505
Barry Warsawa9d499d2008-03-01 18:38:07 +0000506What's New in Python 3.0a4?
507===========================
508
Barry Warsawbb5cd082008-04-02 23:33:27 +0000509*Release date: 02-Apr-2008*
Barry Warsawa9d499d2008-03-01 18:38:07 +0000510
Martin v. Löwis25931462008-03-17 20:43:42 +0000511Core and Builtins
512-----------------
513
514- Bug #2301: Don't try decoding the source code into the original
515 encoding for syntax errors.
516
Martin v. Löwis92fab752008-03-08 10:40:41 +0000517Extension Modules
518-----------------
519
Neal Norwitz6cf49cf2008-03-24 06:22:57 +0000520- The dl module was removed, use the ctypes module instead.
521
Martin v. Löwis92fab752008-03-08 10:40:41 +0000522- Use wchar_t functions in _locale module.
Barry Warsawa9d499d2008-03-01 18:38:07 +0000523
Martin v. Löwis071ef772008-03-08 11:24:24 +0000524Library
525-------
526
Georg Brandl52b92cc2008-05-25 09:43:03 +0000527- The class distutils.commands.build_py.build_py_2to3 can be used as a
528 build_py replacement to automatically run 2to3 on modules that are
529 going to be installed.
Martin v. Löwis73a22f02008-03-22 00:35:10 +0000530
Guido van Rossumf4169812008-03-17 22:56:06 +0000531- A new pickle protocol (protocol 3) is added with explicit support
532 for bytes. This is the default protocol. It intentionally cannot
533 be unpickled by Python 2.x.
534
535- When a pickle written by Python 2.x contains an (8-bit) str
536 instance, this is now decoded to a (Unicode) str instance. The
537 encoding used to do this defaults to ASCII, but can be overridden
538 via two new keyword arguments to the Unpickler class. Previously
539 this would create bytes instances, which is usually wrong: str
540 instances are often used to pickle attribute names etc., and text is
541 more common than binary data anyway.
542
Martin v. Löwis071ef772008-03-08 11:24:24 +0000543- Default to ASCII as the locale.getpreferredencoding, if the POSIX
Georg Brandl52b92cc2008-05-25 09:43:03 +0000544 system doesn't support CODESET and LANG isn't set or doesn't allow
545 deduction of an encoding.
Martin v. Löwis071ef772008-03-08 11:24:24 +0000546
Georg Brandl52b92cc2008-05-25 09:43:03 +0000547- Issue #1202: zlib.crc32 and zlib.adler32 now return an unsigned
548 value.
Gregory P. Smith425136b2008-03-17 20:45:21 +0000549
Georg Brandl52b92cc2008-05-25 09:43:03 +0000550- Issue #719888: Updated tokenize to use a bytes API. generate_tokens
551 has been renamed tokenize and now works with bytes rather than
552 strings. A new detect_encoding function has been added for
553 determining source file encoding according to PEP-0263. Token
554 sequences returned by tokenize always start with an ENCODING token
555 which specifies the encoding used to decode the file. This token is
556 used to encode the output of untokenize back to bytes.
557
Barry Warsawa9d499d2008-03-01 18:38:07 +0000558
Christian Heimesbc873412007-12-08 22:11:32 +0000559What's New in Python 3.0a3?
560===========================
561
Barry Warsaw659fc422008-03-01 17:45:23 +0000562*Release date: 29-Feb-2008*
Christian Heimesbc873412007-12-08 22:11:32 +0000563
564Core and Builtins
565-----------------
566
Georg Brandl52b92cc2008-05-25 09:43:03 +0000567- Issue #2282: io.TextIOWrapper was not overriding seekable() from
568 io.IOBase.
Ka-Ping Yeeddaa7062008-03-17 20:35:15 +0000569
Georg Brandl52b92cc2008-05-25 09:43:03 +0000570- Issue #2115: Important speedup in setting __slot__ attributes. Also
571 prevent a possible crash: an Abstract Base Class would try to access
572 a slot on a registered virtual subclass.
Christian Heimesa156e092008-02-16 07:38:31 +0000573
Georg Brandl52b92cc2008-05-25 09:43:03 +0000574- Fixed repr() and str() of complex numbers with infinity or nan as
575 real or imaginary part.
Christian Heimesa156e092008-02-16 07:38:31 +0000576
Georg Brandl52b92cc2008-05-25 09:43:03 +0000577- Clear all free list during a gc.collect() of the highest generation
578 in order to allow pymalloc to free more arenas. Python may give back
579 memory to the OS earlier.
Christian Heimesa156e092008-02-16 07:38:31 +0000580
Georg Brandl52b92cc2008-05-25 09:43:03 +0000581- Issue #2045: Fix an infinite recursion triggered when printing a
582 subclass of collections.defaultdict, if its default_factory is set
583 to a bound method.
Christian Heimesa156e092008-02-16 07:38:31 +0000584
585- Fixed a minor memory leak in dictobject.c. The content of the free
586 list was not freed on interpreter shutdown.
587
Georg Brandl52b92cc2008-05-25 09:43:03 +0000588- Limit free list of method and builtin function objects to 256
589 entries each.
Christian Heimesa156e092008-02-16 07:38:31 +0000590
Georg Brandl52b92cc2008-05-25 09:43:03 +0000591- Patch #1953: Added ``sys._compact_freelists()`` and the C API
592 functions ``PyInt_CompactFreeList`` and ``PyFloat_CompactFreeList``
Christian Heimesa156e092008-02-16 07:38:31 +0000593 to compact the internal free lists of pre-allocted ints and floats.
594
595- Bug #1983: Fixed return type of fork(), fork1() and forkpty() calls.
Georg Brandl52b92cc2008-05-25 09:43:03 +0000596 Python expected the return type int but the fork familie returns
597 pi_t.
Christian Heimesa156e092008-02-16 07:38:31 +0000598
Georg Brandl52b92cc2008-05-25 09:43:03 +0000599- Issue #1678380: Fix a bug that identifies 0j and -0j when they
600 appear in the same code unit.
Christian Heimesa156e092008-02-16 07:38:31 +0000601
Georg Brandl52b92cc2008-05-25 09:43:03 +0000602- Issue #2025: Added tuple.count() and tuple.index() methods to comply
603 with the collections.Sequence API.
Raymond Hettinger65baa342008-02-07 00:41:02 +0000604
Georg Brandl52b92cc2008-05-25 09:43:03 +0000605- Fixed multiple reinitialization of the Python interpreter. The small
606 int list in longobject.c has caused a seg fault during the third
607 finalization.
Christian Heimesdfc12ed2008-01-31 15:16:38 +0000608
Georg Brandl52b92cc2008-05-25 09:43:03 +0000609- Issue #1973: bytes.fromhex('') raised SystemError.
Christian Heimesc04dac02008-01-30 11:27:57 +0000610
Georg Brandl52b92cc2008-05-25 09:43:03 +0000611- Issue #1771: remove cmp parameter from sorted() and list.sort().
Raymond Hettinger70b64fc2008-01-30 20:15:17 +0000612
Georg Brandl52b92cc2008-05-25 09:43:03 +0000613- Issue #1969: split and rsplit in bytearray are inconsistent.
Christian Heimes7b876152008-01-30 09:51:48 +0000614
Georg Brandl52b92cc2008-05-25 09:43:03 +0000615- map() no longer accepts None for the first argument. Use zip()
616 instead.
Raymond Hettinger1dfde1d2008-01-22 23:25:35 +0000617
Facundo Batista2336bdd2008-01-19 19:12:01 +0000618- Issue #1769: Now int("- 1") is not allowed any more.
619
Georg Brandl52b92cc2008-05-25 09:43:03 +0000620- Object/longobject.c: long(float('nan')) raises an OverflowError
621 instead of returning 0.
Christian Heimes386cd1e2008-01-15 02:01:20 +0000622
Georg Brandl52b92cc2008-05-25 09:43:03 +0000623- Issue #1762972: __file__ points to the source file instead of the
624 pyc/pyo file if the py file exists.
Christian Heimes3b06e532008-01-07 20:12:44 +0000625
Guido van Rossumab078dd2008-01-06 00:09:11 +0000626- Issue #1393: object_richcompare() returns NotImplemented instead of
627 False if the objects aren't equal, to give the other side a chance.
628
Guido van Rossume239b002008-01-06 00:44:20 +0000629- Issue #1692: Interpreter was not displaying location of SyntaxError.
Kurt B. Kaiser43b15092008-01-05 04:32:22 +0000630
Georg Brandl52b92cc2008-05-25 09:43:03 +0000631- Improve some exception messages when Windows fails to load an
632 extension module. Now we get for example '%1 is not a valid Win32
633 application' instead of 'error code 193'. Also use Unicode strings
634 to deal with non-English locales.
Amaury Forgeot d'Arcbccd63c2008-01-04 01:21:27 +0000635
Georg Brandl52b92cc2008-05-25 09:43:03 +0000636- Issue #1587: Added instancemethod wrapper for PyCFunctions. The
637 Python C API has gained a new type *PyInstanceMethod_Type* and the
638 functions *PyInstanceMethod_Check(o)*, *PyInstanceMethod_New(func)*
639 and *PyInstanceMethod_Function(im)*.
Christian Heimesa3534a62007-12-11 19:56:40 +0000640
Georg Brandl52b92cc2008-05-25 09:43:03 +0000641- Constants gc.DEBUG_OBJECT and gc.DEBUG_INSTANCE have been removed
642 from the gc module; gc.DEBUG_COLLECTABLE or gc.DEBUG_UNCOLLECTABLE
643 are now enough to print the corresponding list of objects considered
644 by the garbage collector.
Amaury Forgeot d'Arcad8dcd52007-12-10 23:58:35 +0000645
Georg Brandl52b92cc2008-05-25 09:43:03 +0000646- Issue #1573: Improper use of the keyword-only syntax makes the
647 parser crash.
Christian Heimesbc873412007-12-08 22:11:32 +0000648
Georg Brandl52b92cc2008-05-25 09:43:03 +0000649- Issue #1564: The set implementation should special-case PyUnicode
650 instead of PyString.
Christian Heimes0ded5b52007-12-10 15:50:56 +0000651
Guido van Rossumea6775b2008-02-21 20:16:31 +0000652- Patch #1031213: Decode source line in SyntaxErrors back to its
653 original source encoding.
Christian Heimes7131fd92008-02-19 14:21:46 +0000654
Christian Heimes09aaa882008-02-23 15:01:06 +0000655- inspect.getsource() includes the decorators again.
656
Guido van Rossumea6775b2008-02-21 20:16:31 +0000657- Bug #1713: posixpath.ismount() claims symlink to a mountpoint is a
658 mountpoint.
Christian Heimes7131fd92008-02-19 14:21:46 +0000659
Georg Brandl52b92cc2008-05-25 09:43:03 +0000660- Fix utf-8-sig incremental decoder, which didn't recognise a BOM when
661 the first chunk fed to the decoder started with a BOM, but was
662 longer than 3 bytes.
Christian Heimes7131fd92008-02-19 14:21:46 +0000663
Christian Heimesbc873412007-12-08 22:11:32 +0000664Extension Modules
665-----------------
666
Georg Brandl52b92cc2008-05-25 09:43:03 +0000667- Code for itertools ifilter(), imap(), and izip() moved to bultins
668 and renamed to filter(), map(), and zip(). Also, renamed
669 izip_longest() to zip_longest() and ifilterfalse() to filterfalse().
Raymond Hettinger736c0ab2008-03-13 02:09:15 +0000670
Georg Brandl52b92cc2008-05-25 09:43:03 +0000671- Issue #1762972: Readded the reload() function as imp.reload().
Guido van Rossumea6775b2008-02-21 20:16:31 +0000672
Georg Brandl52b92cc2008-05-25 09:43:03 +0000673- Bug #2111: mmap segfaults when trying to write a block opened with
674 PROT_READ.
Christian Heimesa156e092008-02-16 07:38:31 +0000675
Georg Brandl52b92cc2008-05-25 09:43:03 +0000676- Issue #2063: correct order of utime and stime in os.times() result
677 on Windows.
Christian Heimes7131fd92008-02-19 14:21:46 +0000678
Christian Heimesbc873412007-12-08 22:11:32 +0000679Library
680-------
681
Raymond Hettinger48b8b662008-02-05 01:53:00 +0000682- Weakref dictionaries now inherit from MutableMapping.
Raymond Hettinger48b8b662008-02-05 01:53:00 +0000683
Georg Brandl52b92cc2008-05-25 09:43:03 +0000684- Created new UserDict class in collections module. This one inherits
685 from and complies with the MutableMapping ABC. Also, moved
686 UserString and UserList to the collections module. The
687 MutableUserString class was removed.
Raymond Hettinger48b8b662008-02-05 01:53:00 +0000688
Guido van Rossumea6775b2008-02-21 20:16:31 +0000689- Removed UserDict.DictMixin. Replaced all its uses with
690 collections.MutableMapping.
Raymond Hettingeredf3b732008-02-04 22:07:15 +0000691
Guido van Rossume239b002008-01-06 00:44:20 +0000692- Issue #1703: getpass() should flush after writing prompt.
Christian Heimesfc5aa9d2007-12-11 09:00:01 +0000693
Guido van Rossume239b002008-01-06 00:44:20 +0000694- Issue #1585: IDLE uses non-existent xrange() function.
695
696- Issue #1578: Problems in win_getpass.
697
Georg Brandl52d168a2008-01-07 18:10:24 +0000698Build
699-----
700
Georg Brandl52b92cc2008-05-25 09:43:03 +0000701- Renamed --enable-unicode configure flag to --with-wide-unicode,
702 since Unicode strings can't be disabled anymore.
Georg Brandl52d168a2008-01-07 18:10:24 +0000703
Guido van Rossume239b002008-01-06 00:44:20 +0000704C API
705-----
706
707- Issue #1629: Renamed Py_Size, Py_Type and Py_Refcnt to Py_SIZE,
708 Py_TYPE and Py_REFCNT.
709
Georg Brandl52b92cc2008-05-25 09:43:03 +0000710- New API PyImport_ImportModuleNoBlock(), works like
711 PyImport_ImportModule() but won't block on the import lock
712 (returning an error instead).
Christian Heimes0ec88b32007-12-10 17:02:00 +0000713
Christian Heimesbc873412007-12-08 22:11:32 +0000714
Fred Drake0e474a82007-10-11 18:01:43 +0000715What's New in Python 3.0a2?
Christian Heimesbc873412007-12-08 22:11:32 +0000716===========================
Fred Drake0e474a82007-10-11 18:01:43 +0000717
Guido van Rossum99533a92007-12-06 05:07:41 +0000718*Release date: 07-Dec-2007*
719
720(Note: this list is incomplete.)
Fred Drake0e474a82007-10-11 18:01:43 +0000721
Guido van Rossum40d20bc2007-10-22 00:09:51 +0000722Core and Builtins
723-----------------
724
Brett Cannon37f7e6e2007-10-26 05:42:09 +0000725- str8 now has the same construction signature as bytes.
726
Georg Brandl52b92cc2008-05-25 09:43:03 +0000727- Comparisons between str and str8 now return False/True for ==/!=.
728 sqlite3 returns str8 when recreating on object from it's __conform__
729 value. The struct module returns str8 for all string-related
730 formats. This was true before this change, but becomes more
731 apparent thanks to string comparisons always being False.
Brett Cannon40430012007-10-22 20:24:51 +0000732
Georg Brandl52b92cc2008-05-25 09:43:03 +0000733- Replaced `PyFile_FromFile()` with `PyFile_FromFd(fd, name. mode,
734 buffer, encoding, newline)`.
Guido van Rossum40d20bc2007-10-22 00:09:51 +0000735
736- Fixed `imp.find_module()` to obey the -*- coding: -*- header.
737
738- Changed `__file__` and `co_filename` to unicode. The path names are decoded
Antoine Pitrou6e1df8d2008-07-25 19:58:18 +0000739 with `Py_FileSystemDefaultEncoding` and a new API method
Guido van Rossum40d20bc2007-10-22 00:09:51 +0000740 `PyUnicode_DecodeFSDefault(char*)` was added.
741
Georg Brandl52b92cc2008-05-25 09:43:03 +0000742- io.open() and _fileio.FileIO have grown a new argument closefd. A
743 false value disables the closing of the file descriptor.
Guido van Rossum2dced8b2007-10-30 17:27:30 +0000744
Georg Brandl52b92cc2008-05-25 09:43:03 +0000745- Added a new option -b to issues warnings (-bb for errors) about
746 certain operations between bytes/buffer and str like str(b'') and
747 comparison.
Guido van Rossum98297ee2007-11-06 21:34:58 +0000748
Georg Brandl52b92cc2008-05-25 09:43:03 +0000749- The standards streams sys.stdin, stdout and stderr may be None when
750 the when the C runtime library returns an invalid file descriptor
751 for the streams (fileno(stdin) < 0). For now this happens only for
752 Windows GUI apps and scripts started with `pythonw.exe`.
Christian Heimes58cb1b82007-11-13 02:19:40 +0000753
Christian Heimesbce52be2007-11-17 19:08:41 +0000754- Added PCbuild9 directory for VS 2008.
755
Georg Brandl52b92cc2008-05-25 09:43:03 +0000756- Renamed structmember.h WRITE_RESTRICTED to PY_WRITE_RESTRICTED to
757 work around a name clash with VS 2008 on Windows.
Christian Heimesbce52be2007-11-17 19:08:41 +0000758
Georg Brandl52b92cc2008-05-25 09:43:03 +0000759- Unbound methods are gone for good. ClassObject.method returns an
760 ordinary function object, instance.method still returns a bound
761 method object. The API of bound methods is cleaned up, too. The
762 im_class attribute is removed and im_func + im_self are renamed to
763 __func__ and __self__. The factory PyMethod_New takes only func and
764 instance as argument.
Christian Heimesff737952007-11-27 10:40:20 +0000765
Georg Brandl52b92cc2008-05-25 09:43:03 +0000766- intobject.h is no longer included by Python.h. The remains were
767 moved to longobject.h. It still exists to define several aliases
768 from PyInt_ to PyLong_ functions.
Christian Heimesf78b1c62007-12-02 16:52:32 +0000769
Christian Heimesa37d4c62007-12-04 23:02:19 +0000770- Removed sys.maxint, use sys.maxsize instead.
771
Fred Drake0e474a82007-10-11 18:01:43 +0000772Extension Modules
773-----------------
774
775- The `hotshot` profiler has been removed; use `cProfile` instead.
776
Brett Cannone9fd2312007-10-12 19:18:19 +0000777Library
778-------
779
Georg Brandl52b92cc2008-05-25 09:43:03 +0000780- When loading an external file using testfile(), the passed-in
781 encoding argument was being ignored if __loader__ is defined and
782 forcing the source to be UTF-8.
Brett Cannone9fd2312007-10-12 19:18:19 +0000783
Georg Brandl52b92cc2008-05-25 09:43:03 +0000784- The methods `os.tmpnam()`, `os.tempnam()` and `os.tmpfile()` have
785 been removed in favor of the tempfile module.
Guido van Rossum687b9c02007-10-25 23:18:51 +0000786
Christian Heimesc9543e42007-11-28 08:28:28 +0000787- Removed the 'new' module.
788
Georg Brandl52b92cc2008-05-25 09:43:03 +0000789- Removed all types from the 'types' module that are easily accessable
790 through builtins.
Brett Cannone9fd2312007-10-12 19:18:19 +0000791
Georg Brandl52d168a2008-01-07 18:10:24 +0000792
Guido van Rossum4405cf32007-08-30 17:16:55 +0000793What's New in Python 3.0a1?
Guido van Rossum45aecf42006-03-15 04:58:47 +0000794==========================
Thomas Wouters4d70c3d2006-06-08 14:42:34 +0000795
Guido van Rossum4405cf32007-08-30 17:16:55 +0000796*Release date: 31-Aug-2007*
Neal Norwitz4886cc32006-08-21 17:06:07 +0000797
798Core and Builtins
799-----------------
800
Martin v. Löwis47383402007-08-15 07:32:56 +0000801- PEP 3131: Support non-ASCII identifiers.
802
Martin v. Löwis447d33e2007-07-29 18:10:01 +0000803- PEP 3120: Change default encoding to UTF-8.
804
Martin v. Löwis9f2e3462007-07-21 17:22:18 +0000805- PEP 3123: Use proper C inheritance for PyObject.
806
Guido van Rossumcd16bf62007-06-13 18:07:49 +0000807- Removed the __oct__ and __hex__ special methods and added a bin()
808 builtin function.
809
Georg Brandl52b92cc2008-05-25 09:43:03 +0000810- PEP 3127: octal literals now start with "0o". Old-style octal
811 literals are invalid. There are binary literals with a prefix of
812 "0b". This also affects int(x, 0).
Guido van Rossumcd16bf62007-06-13 18:07:49 +0000813
Guido van Rossume7ba4952007-06-06 23:52:48 +0000814- None, True, False are now keywords.
815
Guido van Rossum29478ef2007-05-29 00:39:44 +0000816- PEP 3119: isinstance() and issubclass() can be overridden.
817
Guido van Rossumebe3e162007-05-17 18:20:34 +0000818- Remove BaseException.message.
819
Guido van Rossum1bc535d2007-05-15 18:46:22 +0000820- Remove tuple parameter unpacking (PEP 3113).
821
Georg Brandl52b92cc2008-05-25 09:43:03 +0000822- Remove the f_restricted attribute from frames. This naturally leads
823 to the removal of PyEval_GetRestricted() and PyFrame_IsRestricted().
Guido van Rossuma8add0e2007-05-14 22:03:55 +0000824
Georg Brandl52b92cc2008-05-25 09:43:03 +0000825- PEP 3132 was accepted. That means that you can do ``a, *b =
826 range(5)`` to assign 0 to a and [1, 2, 3, 4] to b.
Guido van Rossum0368b722007-05-11 16:50:42 +0000827
Georg Brandl52b92cc2008-05-25 09:43:03 +0000828- range() now returns an iterator rather than a list. Floats are not
829 allowed. xrange() is no longer defined.
Guido van Rossum805365e2007-05-07 22:24:25 +0000830
Nick Coghlan650f0d02007-04-15 12:05:43 +0000831- Patch #1660500: hide iteration variable in list comps, add set comps
Georg Brandl52b92cc2008-05-25 09:43:03 +0000832 and use common code to handle compilation of iterative expressions.
Nick Coghlan650f0d02007-04-15 12:05:43 +0000833
Guido van Rossume27dc722007-03-27 22:37:34 +0000834- By default, != returns the opposite of ==, unless the latter returns
835 NotImplemented.
836
Georg Brandl52b92cc2008-05-25 09:43:03 +0000837- Patch #1680961: sys.exitfunc has been removed and replaced with a
838 private C-level API.
Collin Winter670e6922007-03-21 02:57:17 +0000839
Georg Brandl801dd732007-03-18 20:18:31 +0000840- PEP 3115: new metaclasses: the metaclass is now specified as a
Georg Brandl52b92cc2008-05-25 09:43:03 +0000841 keyword arg in the class statement, which can now use the full
842 syntax of a parameter list. Also, the metaclass can implement a
843 __prepare__ function which will be called to create the dictionary
844 for the new class namespace.
Georg Brandl801dd732007-03-18 20:18:31 +0000845
Georg Brandl428f0642007-03-18 18:35:15 +0000846- The long-deprecated argument "pend" of PyFloat_FromString() has been
847 removed.
848
Georg Brandle32b4222007-03-10 22:13:27 +0000849- The dir() function has been extended to call the __dir__() method on
Georg Brandl52b92cc2008-05-25 09:43:03 +0000850 its argument, if it exists. If not, it will work like before. This
851 allows customizing the output of dir() in the presence of a
852 __getattr__().
Brett Cannonba7bf492007-02-27 00:15:55 +0000853
Neal Norwitz8dfc4a92007-08-11 06:39:53 +0000854- Removed support for __members__ and __methods__.
855
Georg Brandle32b4222007-03-10 22:13:27 +0000856- Removed indexing/slicing on BaseException.
Neal Norwitz2633c692007-02-26 22:22:47 +0000857
Georg Brandle32b4222007-03-10 22:13:27 +0000858- input() became raw_input(): the name input() now implements the
Georg Brandl52b92cc2008-05-25 09:43:03 +0000859 functionality formerly known as raw_input(); the name raw_input() is
860 no longer defined.
Guido van Rossum0240b922007-02-26 21:23:50 +0000861
Georg Brandl52b92cc2008-05-25 09:43:03 +0000862- Classes listed in an 'except' clause must inherit from
863 BaseException.
Brett Cannonf74225d2007-02-26 21:10:16 +0000864
Guido van Rossumcc2b0162007-02-11 06:12:03 +0000865- PEP 3106: dict.iterkeys(), .iteritems(), .itervalues() are now gone;
Guido van Rossumcf1be882007-08-30 22:07:17 +0000866 and .keys(), .items(), .values() return dict views, which behave
867 like sets.
Guido van Rossumcc2b0162007-02-11 06:12:03 +0000868
Guido van Rossum8b545362007-02-09 23:52:14 +0000869- PEP 3105: print is now a function. Also (not in the PEP) the
Georg Brandl52b92cc2008-05-25 09:43:03 +0000870 'softspace' attribute of files is now gone (since print() doesn't
871 use it). A side effect of this change is that you can get
872 incomplete output lines in interactive sessions:
Guido van Rossum8b545362007-02-09 23:52:14 +0000873
874 >>> print(42, end="")
Kurt B. Kaiser2c7f3142007-08-30 21:52:19 +0000875 42>>>
Guido van Rossum8b545362007-02-09 23:52:14 +0000876
877 We may be able to fix this after the I/O library rewrite.
Guido van Rossum4502c802007-02-09 05:42:38 +0000878
Brett Cannon398db8b2007-01-29 23:44:37 +0000879- PEP 3102: keyword-only arguments.
880
Georg Brandl52b92cc2008-05-25 09:43:03 +0000881- Int/Long unification is complete. The 'long' built-in type and
882 literals with trailing 'L' or 'l' have been removed. Performance
883 may be sub-optimal (haven't really benchmarked).
Guido van Rossumab186842007-01-14 03:42:30 +0000884
885- 'except E, V' must now be spelled as 'except E as V' and deletes V
886 at the end of the except clause; V must be a simple name.
887
Neal Norwitzc1505362006-12-28 06:47:50 +0000888- Added function annotations per PEP 3107.
889
Georg Brandl52b92cc2008-05-25 09:43:03 +0000890- Added nonlocal declaration from PEP 3104:
Jeremy Hyltona4f9fc62007-02-27 15:53:28 +0000891
892 >>> def f(x):
893 ... def inc():
894 ... nonlocal x
895 ... x += 1
896 ... return x
897 ... return inc
898 ...
899 >>> inc = f(0)
900 >>> inc()
901 1
902 >>> inc()
903 2
904
Georg Brandl66a796e2006-12-19 20:50:34 +0000905- Moved intern() to sys.intern().
906
907- exec is now a function.
908
909- Renamed nb_nonzero to nb_bool and __nonzero__ to __bool__.
Jack Diederich4dafcc42006-11-28 19:15:13 +0000910
Neal Norwitz4886cc32006-08-21 17:06:07 +0000911- Classic classes are a thing of the past. All classes are new style.
912
913- Exceptions *must* derive from BaseException.
914
915- Integer division always returns a float. The -Q option is no more.
916 All the following are gone:
917 * PyNumber_Divide and PyNumber_InPlaceDivide
918 * __div__, __rdiv__, and __idiv__
919 * nb_divide, nb_inplace_divide
920 * operator.div, operator.idiv, operator.__div__, operator.__idiv__
921 (Only __truediv__ and __floordiv__ remain, not sure how to handle them
922 if we want to re-use __div__ and friends. If we do, it will make
923 it harder to write code for both 2.x and 3.x.)
924
925- 'as' and 'with' are keywords.
926
927- Absolute import is the default behavior for 'import foo' etc.
928
Georg Brandl52b92cc2008-05-25 09:43:03 +0000929- Removed support for syntax: backticks (ie, `x`), <>.
Neal Norwitz378b2c92006-08-29 07:57:22 +0000930
Georg Brandl52b92cc2008-05-25 09:43:03 +0000931- Removed these Python builtins: apply(), callable(), coerce(),
932 execfile(), file(), reduce(), reload().
Neal Norwitz4886cc32006-08-21 17:06:07 +0000933
Georg Brandl52b92cc2008-05-25 09:43:03 +0000934- Removed these Python methods: {}.has_key.
Neal Norwitz378b2c92006-08-29 07:57:22 +0000935
Georg Brandl52b92cc2008-05-25 09:43:03 +0000936- Removed these opcodes: BINARY_DIVIDE, INPLACE_DIVIDE, UNARY_CONVERT.
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000937
938- Remove C API support for restricted execution.
939
Guido van Rossumcf1be882007-08-30 22:07:17 +0000940- zip(), map() and filter() now return iterators, behaving like their
Georg Brandl52b92cc2008-05-25 09:43:03 +0000941 itertools counterparts. This also affect map()'s behavior on
Guido van Rossumcf1be882007-08-30 22:07:17 +0000942 sequences of unequal length -- it now stops after the shortest one
943 is exhausted.
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000944
Georg Brandl52b92cc2008-05-25 09:43:03 +0000945- Additions: set literals, set comprehensions, ellipsis literal.
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000946
947- Added class decorators per PEP 3129.
948
949
950Extension Modules
951-----------------
952
Georg Brandl52b92cc2008-05-25 09:43:03 +0000953- Removed the imageop module. Obsolete long with its unit tests
954 becoming useless from the removal of rgbimg and imgfile.
Neal Norwitz4886cc32006-08-21 17:06:07 +0000955
Georg Brandl52b92cc2008-05-25 09:43:03 +0000956- Removed these attributes from the operator module: div, idiv,
957 __div__, __idiv__, isCallable, sequenceIncludes.
958
959- Removed these attributes from the sys module: exc_clear(), exc_type,
960 exc_value, exc_traceback.
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000961
962
963Library
964-------
965
Georg Brandl52b92cc2008-05-25 09:43:03 +0000966- Removed the compiler package. Use of the _ast module and (an
967 eventual) AST -> bytecode mechanism.
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000968
Georg Brandl52b92cc2008-05-25 09:43:03 +0000969- Removed these modules: audiodev, Bastion, bsddb185, exceptions,
970 linuxaudiodev, md5, MimeWriter, mimify, popen2, rexec, sets, sha,
971 stringold, strop, sunaudiodev, timing, xmllib.
Guido van Rossum33d26892007-08-05 15:29:28 +0000972
Georg Brandl52b92cc2008-05-25 09:43:03 +0000973- Moved the toaiff module to Tools/Demos.
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000974
Georg Brandl52b92cc2008-05-25 09:43:03 +0000975- Removed obsolete IRIX modules: al/AL, cd/CD, cddb, cdplayer, cl/CL,
976 DEVICE, ERRNO, FILE, fl/FL, flp, fm, GET, gl/GL, GLWS, IN, imgfile,
977 IOCTL, jpeg, panel, panelparser, readcd, sgi, sv/SV, torgb, WAIT.
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000978
Georg Brandl52b92cc2008-05-25 09:43:03 +0000979- Removed obsolete functions: commands.getstatus(), os.popen*().
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000980
Georg Brandl52b92cc2008-05-25 09:43:03 +0000981- Removed functions in the string module that are also string methods;
Martin v. Löwis967f1e32007-08-14 09:23:10 +0000982 Remove string.{letters, lowercase, uppercase}.
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000983
Georg Brandl52b92cc2008-05-25 09:43:03 +0000984- Removed support for long obsolete platforms: plat-aix3, plat-irix5.
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000985
Georg Brandl52b92cc2008-05-25 09:43:03 +0000986- Removed xmlrpclib.SlowParser. It was based on xmllib.
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000987
988- Patch #1680961: atexit has been reimplemented in C.
989
Walter Dörwald41980ca2007-08-16 21:55:45 +0000990- Add new codecs for UTF-32, UTF-32-LE and UTF-32-BE.
991
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000992Build
993-----
994
995C API
996-----
997
Georg Brandl52b92cc2008-05-25 09:43:03 +0000998- Removed these Python slots: __coerce__, __div__, __idiv__, __rdiv__.
Neal Norwitz4886cc32006-08-21 17:06:07 +0000999
Georg Brandl52b92cc2008-05-25 09:43:03 +00001000- Removed these C APIs: PyNumber_Coerce(), PyNumber_CoerceEx(),
1001 PyMember_Get, PyMember_Set.
Neal Norwitz4886cc32006-08-21 17:06:07 +00001002
Georg Brandl52b92cc2008-05-25 09:43:03 +00001003- Removed these C slots/fields: nb_divide, nb_inplace_divide.
Neal Norwitz4886cc32006-08-21 17:06:07 +00001004
Georg Brandl52b92cc2008-05-25 09:43:03 +00001005- Removed these macros: staticforward, statichere, PyArg_GetInt,
1006 PyArg_NoArgs, _PyObject_Del.
Neal Norwitz4886cc32006-08-21 17:06:07 +00001007
Georg Brandl52b92cc2008-05-25 09:43:03 +00001008- Removed these typedefs: intargfunc, intintargfunc, intobjargproc,
1009 intintobjargproc, getreadbufferproc, getwritebufferproc,
1010 getsegcountproc, getcharbufferproc, memberlist.
Raymond Hettinger4901a1f2004-12-02 08:59:14 +00001011
Raymond Hettinger4901a1f2004-12-02 08:59:14 +00001012Tests
1013-----
1014
Brett Cannone7a30f72008-03-03 03:36:27 +00001015- Removed test.testall as test.regrtest replaces it.
1016
Brett Cannonced04e02005-02-13 22:53:22 +00001017Documentation
1018-------------
1019
Raymond Hettinger4901a1f2004-12-02 08:59:14 +00001020Mac
1021---
1022
Georg Brandl52b92cc2008-05-25 09:43:03 +00001023- The cfmfile module was removed.
Guido van Rossume7ba4952007-06-06 23:52:48 +00001024
Guido van Rossum845702c2007-08-30 18:44:53 +00001025Platforms
1026---------
1027
1028- Support for BeOS and AtheOS was removed (according to PEP 11).
1029
1030- Support for RiscOS, Irix, Tru64 was removed (alledgedly).
1031
Raymond Hettinger4901a1f2004-12-02 08:59:14 +00001032Tools/Demos
1033-----------
1034
Georg Brandl52b92cc2008-05-25 09:43:03 +00001035
Skip Montanaroe5d7f7f2002-09-20 14:16:59 +00001036**(For information about older versions, consult the HISTORY file.)**