blob: d1be39ca20ea408491076cdd99f856154280c546 [file] [log] [blame]
Skip Montanaroe5d7f7f2002-09-20 14:16:59 +00001+++++++++++
2Python News
3+++++++++++
4
Anthony Baxterb0c66302004-11-04 05:23:17 +00005(editors: check NEWS.help for information about editing NEWS using ReST.)
6
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
Brett Cannon54bd41d2008-09-02 04:01:42 +000015- Issue 3639: The _warnings module could segfault the interpreter when
16 unexpected types were passed in as arguments.
17
Antoine Pitrouc6b09eb2008-09-01 15:10:14 +000018- Issue #3712: The memoryview object had a reference leak and didn't support
19 cyclic garbage collection.
20
Antoine Pitrouf71995782008-08-29 18:37:05 +000021- Issue #3668: Fix a memory leak with the "s*" argument parser in
22 PyArg_ParseTuple and friends, which occurred when the argument for "s*"
23 was correctly parsed but parsing of subsequent arguments failed.
24
Amaury Forgeot d'Arcdb26f7c2008-08-29 07:13:32 +000025- Issue #3611: An exception __context__ could be cleared in a complex pattern
26 involving a __del__ method re-raising an exception.
27
Antoine Pitrouec569b72008-08-26 22:40:48 +000028- Issue #2534: speed up isinstance() and issubclass() by 50-70%, so as to
29 match Python 2.5 speed despite the __instancecheck__ / __subclasscheck__
30 mechanism. In the process, fix a bug where isinstance() and issubclass(),
31 when given a tuple of classes as second argument, were looking up
32 __instancecheck__ / __subclasscheck__ on the tuple rather than on each
33 type object.
34
Antoine Pitroue2dffc02008-08-26 22:02:58 +000035- Issue #3663: Py_None was decref'd when printing SyntaxErrors.
36
Benjamin Peterson9edd2bd2008-08-27 00:31:37 +000037- Issue #3651: Fix various memory leaks when using the buffer
38 interface, or when the "s#" code of PyArg_ParseTuple is given a
39 bytes object.
40
Neal Norwitz6ae2eb22008-08-24 23:50:08 +000041- Issue #3657: Fix uninitialized memory read when pickling longs.
42 Found by valgrind.
43
Neal Norwitz3ce5d922008-08-24 07:08:55 +000044- Apply security patches from Apple.
45
Neal Norwitz2f99b242008-08-24 05:48:10 +000046- Fix crashes on memory allocation failure found with failmalloc.
47
48- Fix memory leaks found with valgrind and update suppressions file.
49
50- Fix compiler warnings in opt mode which would lead to invalid memory reads.
51
52- Fix problem using wrong name in decimal module reported by pychecker.
53
Amaury Forgeot d'Arc20443f32008-08-22 22:05:20 +000054- Issue #3650: Fixed a reference leak in bytes.split('x').
55
Benjamin Petersonc15a0732008-08-26 16:46:47 +000056- bytes(o) now tries to use o.__bytes__() before using fallbacks.
57
58C API
59-----
60
61- PyObject_Bytes and PyBytes_FromObject were added.
62
Barry Warsaw8509df72008-08-21 03:02:47 +000063Library
64-------
65
Marc-André Lemburg7b2b1f92008-09-02 12:10:46 +000066- Issue #3719: platform.architecture() fails if there are spaces in the
67 path to the Python binary.
68
Brett Cannonec92e182008-09-02 02:46:59 +000069- Issue 3602: As part of the merge of r66135, make the parameters on
70 warnings.catch_warnings() keyword-only. Also remove a DeprecationWarning.
71
Benjamin Petersonb3085c92008-09-01 23:09:31 +000072- The deprecation warnings for the camelCase threading API names were removed.
73
Benjamin Peterson6784eb72008-08-23 20:32:27 +000074Extension Modules
75-----------------
76
77- Issue #3643: Added a few more checks to _testcapi to prevent segfaults by
78 exploitation of poor argument checking.
79
Jesus Cea6ba33292008-08-31 14:12:11 +000080- bsddb code updated to version 4.7.3pre2. This code is the same than
81 Python 2.6 one, since the intention is to keep an unified 2.x/3.x codebase.
82 The Python code is automatically translated using "2to3". Please, do not
83 update this code in Python 3.0 by hand. Update the 2.6 one and then
84 do "2to3".
85
Neal Norwitz8f2f22a2008-08-24 20:59:23 +000086Tools/Demos
87-----------
88
89- Fix Misc/gdbinit so it works.
90
Barry Warsaw8509df72008-08-21 03:02:47 +000091
Antoine Pitrou6e1df8d2008-07-25 19:58:18 +000092What's new in Python 3.0b3?
93===========================
94
Barry Warsaw57c10582008-08-21 02:39:51 +000095*Release date: 20-Aug-2008*
Antoine Pitrou6e1df8d2008-07-25 19:58:18 +000096
Antoine Pitrou9a2310d2008-07-25 22:39:39 +000097Core and Builtins
98-----------------
99
Benjamin Petersonbc74e5b2008-08-23 20:19:17 +0000100- Issue #3653: Fix a segfault when sys.excepthook was called with invalid
101 arguments.
102
Antoine Pitrou616d2852008-08-19 22:09:34 +0000103- Issue #2394: implement more of the memoryview API, with the caveat that
104 only one-dimensional contiguous buffers are supported and exercised right
105 now. Slicing, slice assignment and comparison (equality and inequality)
106 have been added. Also, the tolist() method has been implemented, but only
107 for byte buffers. Endly, the API has been updated to return bytes objects
108 wherever it used to return bytearrays.
109
Antoine Pitrouee58fa42008-08-19 18:22:14 +0000110- Issue #3560: clean up the new C PyMemoryView API so that naming is
111 internally consistent; add macros PyMemoryView_GET_BASE() and
112 PyMemoryView_GET_BUFFER() to access useful properties of a memory views
113 without relying on a particular implementation; remove the ill-named
114 PyMemoryView() function (PyMemoryView_GET_BUFFER() can be used instead).
115
Thomas Hellerf5049fc2008-08-19 19:49:49 +0000116- ctypes function pointers that are COM methods have a boolean True
117 value again.
118
Antoine Pitrou9a2310d2008-07-25 22:39:39 +0000119- Issue #1819: function calls with several named parameters are now on
120 average 35% faster (as measured by pybench).
121
Marc-André Lemburg4cc0f242008-08-07 18:54:33 +0000122- The undocumented C APIs PyUnicode_AsString() and
123 PyUnicode_AsStringAndSize() were made private to the interpreter, in
124 order to be able to refine their interfaces for Python 3.1.
125
126 If you need to access the UTF-8 representation of a Unicode object
127 as bytes string, please use PyUnicode_AsUTF8String() instead.
128
Antoine Pitrouaf14b792008-08-07 21:50:41 +0000129- Issue #3460: PyUnicode_Join() implementation is 10% to 80% faster thanks
130 to Python 3.0's stricter semantics which allow to avoid successive
131 reallocations of the result string (this also affects str.join()).
132
Marc-André Lemburg4cc0f242008-08-07 18:54:33 +0000133
Antoine Pitrou6e1df8d2008-07-25 19:58:18 +0000134Library
135-------
136
Hye-Shik Chang50d1f792008-08-23 08:03:03 +0000137- Issue #1276: Added temporary aliases for CJK Mac encodings to resolve
138 a build problem on MacOS with CJK locales. It adds four temporary
139 mappings to existing legacy codecs that are virtually compatible
140 with Mac encodings. They will be replaced by codecs correctly
141 implemented in 3.1.
142
Amaury Forgeot d'Arc41e36672008-08-20 21:35:50 +0000143- Issue #3614: Corrected a typo in xmlrpc.client, leading to a NameError
144 "global name 'header' is not defined".
145
Antoine Pitroufd036452008-08-19 17:56:33 +0000146- Issue #2834: update the regular expression library to match the unicode
147 standards of py3k. In other words, mixing bytes and unicode strings
148 (be it as pattern, search string or replacement string) raises a TypeError.
149 Moreover, the re.UNICODE flag is enabled automatically for unicode patterns,
150 and can be disabled by specifying a new re.ASCII flag; as for bytes
151 patterns, ASCII matching is the only option and trying to specify re.UNICODE
152 for such patterns raises a ValueError.
153
Guido van Rossum52dbbb92008-08-18 21:44:30 +0000154- Issue #3300: make urllib.parse.[un]quote() default to UTF-8.
155 Code contributed by Matt Giuca. quote() now encodes the input
156 before quoting, unquote() decodes after unquoting. There are
157 new arguments to change the encoding and errors settings.
158 There are also new APIs to skip the encode/decode steps.
159 [un]quote_plus() are also affected.
160
Nick Coghlan36f49522008-08-18 12:31:52 +0000161- Issue #2235: numbers.Number now blocks inheritance of the default id()
162 based hash because that hash mechanism is not correct for numeric types.
163 All concrete numeric types that inherit from Number (rather than just
164 registering with it) must explicitly provide a hash implementation in
165 order for their instances to be hashable.
166
Benjamin Peterson4cd6a952008-08-17 20:23:46 +0000167- Issue #2676: in the email package, content-type parsing was hanging on
168 pathological input because of quadratic or exponential behaviour of a
169 regular expression.
170
Antoine Pitrou87695762008-08-14 22:44:29 +0000171- Issue #3476: binary buffered reading through the new "io" library is now
172 thread-safe.
173
Robert Schuppenies3d1c7de2008-08-10 11:28:17 +0000174- Issue #1342811: Fix leak in Tkinter.Menu.delete. Commands associated to
175 menu entries were not deleted.
176
Lars Gustäbel0c24e8b2008-08-02 11:43:24 +0000177- Remove the TarFileCompat class from tarfile.py.
178
Amaury Forgeot d'Arcbdbddf82008-08-01 00:06:49 +0000179- Issue #2491: os.fdopen is now almost an alias for the built-in open(), and
180 accepts the same parameters. It just checks that its first argument is an
181 integer.
182
Antoine Pitrou6e1df8d2008-07-25 19:58:18 +0000183- Issue #3394: zipfile.writestr sets external attributes when passed a
184 file name rather than a ZipInfo instance, so files are extracted with
185 mode 0600 rather than 000 under Unix.
186
Antoine Pitrouc66f9092008-07-28 19:46:11 +0000187- Issue #2523: Fix quadratic behaviour when read()ing a binary file without
188 asking for a specific length.
Antoine Pitrou6e1df8d2008-07-25 19:58:18 +0000189
Martin v. Löwis371bb502008-08-16 13:02:57 +0000190Extension Modules
191-----------------
192
193- Bug #3542: Support Unicode strings in _msi module.
194
Amaury Forgeot d'Arc9196dc62008-06-19 20:54:32 +0000195What's new in Python 3.0b2?
196===========================
197
Barry Warsaw4bd1cef2008-07-18 02:28:44 +0000198*Release date: 17-Jul-2008*
Amaury Forgeot d'Arc9196dc62008-06-19 20:54:32 +0000199
200Core and Builtins
201-----------------
202
Mark Dickinson65fe25e2008-07-16 11:30:51 +0000203- Issue #3008: the float type has a new instance method 'float.hex'
204 and a new class method 'float.fromhex' to convert floating-point
205 numbers to and from hexadecimal strings, respectively.
206
Eric Smithd68af8f2008-07-16 00:15:35 +0000207- Issue #3083: Add alternate (#) formatting for bin, oct, hex output
208 for str.format(). This adds the prefix 0b, 0o, or 0x, respectively.
209
Amaury Forgeot d'Arca4db6862008-07-04 21:26:43 +0000210- Issue #3280: like chr(), the "%c" format now accepts unicode code points
211 beyond the Basic Multilingual Plane (above 0xffff) on all configurations. On
212 "narrow Unicode" builds, the result is a string of 2 code units, forming a
213 UTF-16 surrogate pair.
214
Georg Brandld52429f2008-07-04 15:55:02 +0000215- Issue #3282: str.isprintable() should return False for undefined
216 Unicode characters.
217
Martin v. Löwis029656f2008-06-30 04:06:08 +0000218- Issue #3236: Return small longs from PyLong_FromString.
219
Benjamin Petersone6528212008-07-15 15:32:09 +0000220- Exception tracebacks now support exception chaining.
221
Amaury Forgeot d'Arc9196dc62008-06-19 20:54:32 +0000222Library
223-------
224
Brett Cannonc2542e92008-07-25 18:19:20 +0000225- Removed the sunaudio module. Use sunau instead.
226
Thomas Heller47bc8092008-08-19 06:38:12 +0000227- Issue #3554: ctypes.string_at and ctypes.wstring_at did call Python
228 api functions without holding the GIL, which could lead to a fatal
229 error when they failed.
230
231- Issue #799428: Fix Tkinter.Misc._nametowidget to unwrap Tcl command objects.
232
Georg Brandl30704ea02008-07-23 15:07:12 +0000233- Removed "ast" function aliases from the parser module.
234
Thomas Heller15383a02008-07-15 19:46:52 +0000235- Issue #3313: Fixed a crash when a failed dlopen() call does not set
236 a valid dlerror() message.
237
Thomas Heller0261e1e2008-07-15 17:25:07 +0000238- Issue #3258: Fixed a crash when a ctypes POINTER type to an
239 incomplete structure was created.
240
Georg Brandl1abcbf82008-07-01 19:28:43 +0000241- Issue #2683: Fix inconsistency in subprocess.Popen.communicate(): the
242 argument now must be a bytes object in any case.
243
Amaury Forgeot d'Arc9196dc62008-06-19 20:54:32 +0000244- Issue #3145: help("modules whatever") failed when trying to load the source
245 code of every single module of the standard library, including invalid files
246 used in the test suite.
247
Georg Brandlbded4d32008-07-17 18:15:35 +0000248- The gettext library now consistently uses Unicode strings for message ids
249 and message strings, and ``ugettext()`` and the like don't exist anymore.
Benjamin Peterson801844d2008-07-14 14:32:15 +0000250
Benjamin Petersone6528212008-07-15 15:32:09 +0000251- The traceback module has been expanded to handle chained exceptions.
252
Amaury Forgeot d'Arc612f61f2008-07-02 23:02:21 +0000253C API
254-----
255
256- Issue #3247: the function Py_FindMethod was removed. Modern types should
257 use the tp_methods slot instead.
258
Benjamin Petersonde9c8692008-07-01 18:23:09 +0000259Tools/Demos
260-----------
261
Georg Brandl336341f2008-07-01 20:21:28 +0000262- The Mac/Demos directory has been removed.
Benjamin Petersonde9c8692008-07-01 18:23:09 +0000263
Georg Brandl336341f2008-07-01 20:21:28 +0000264- All of the Mac scripts have been removed (including BuildApplet.py).
Benjamin Petersonde9c8692008-07-01 18:23:09 +0000265
266
Brett Cannon0d71ee72008-05-08 18:13:40 +0000267What's new in Python 3.0b1?
268===========================
269
Barry Warsawc1e689e2008-06-19 00:35:43 +0000270*Release date: 18-Jun-2008*
Brett Cannon0d71ee72008-05-08 18:13:40 +0000271
272Core and Builtins
273-----------------
274
Brett Cannondb734912008-06-27 00:52:15 +0000275- Issue #3211: warnings.warn_explicit() did not guard against its 'registry'
276 argument being anything other than a dict or None. Also fixed a bug in error
277 handling when 'message' and 'category' were both set to None, triggering a
278 bus error.
279
Amaury Forgeot d'Arcc856c7a2008-06-16 19:50:09 +0000280- Issue #3100: Corrected a crash on deallocation of a subclassed weakref which
281 holds the last (strong) reference to its referent.
282
Georg Brandl559e5d72008-06-11 18:37:52 +0000283- Issue #2630: implement PEP 3138. repr() now returns printable
284 Unicode characters unescaped, to get an ASCII-only representation
285 of an object use ascii().
286
Amaury Forgeot d'Arcf1ca0b12008-06-11 17:40:47 +0000287- Issue #1342: On windows, Python could not start when installed in a
288 directory with non-ascii characters.
289
Martin v. Löwis1a214512008-06-11 05:26:20 +0000290- Implement PEP 3121: new module initialization and finalization API.
291
Georg Brandle1b5ac62008-06-04 13:06:58 +0000292- Removed the already-defunct ``-t`` option.
293
Amaury Forgeot d'Arc74c71f52008-05-26 21:41:42 +0000294- Issue #2957: Corrected a ValueError "recursion limit exceeded", when
295 unmarshalling many code objects, which happens when importing a
296 large .pyc file (~1000 functions).
297
Georg Brandl52b92cc2008-05-25 09:43:03 +0000298- Issue #2963: fix merging oversight that disabled method cache for
299 all types.
Georg Brandl1bcf35a2008-05-25 09:32:09 +0000300
Georg Brandlc9b09532008-05-25 09:24:38 +0000301- Issue #2964: fix a missing INCREF in instancemethod_descr_get.
302
Georg Brandl52b92cc2008-05-25 09:43:03 +0000303- Issue #2895: Don't crash when given bytes objects as keyword names.
Georg Brandld8b690f2008-05-16 17:28:50 +0000304
Georg Brandl52b92cc2008-05-25 09:43:03 +0000305- Issue #2798: When parsing arguments with PyArg_ParseTuple, the "s"
306 code now allows any unicode string and returns a utf-8 encoded
307 buffer, just like the "s#" code already does. The "z" code was
308 corrected as well.
Amaury Forgeot d'Arc07404592008-05-12 13:19:07 +0000309
Georg Brandl52b92cc2008-05-25 09:43:03 +0000310- Issue #2863: generators now have a ``gen.__name__`` attribute that
311 equals ``gen.gi_code.co_name``, like ``func.__name___`` that equals
312 ``func.func_code.co_name``. The repr() of a generator now also
313 contains this name.
Alexandre Vassalottie9f305f2008-05-16 04:39:54 +0000314
315- Issue #2831: enumerate() now has a ``start`` argument.
316
Georg Brandl52b92cc2008-05-25 09:43:03 +0000317- Issue #2801: fix bug in the float.is_integer method where a
318 ValueError was sometimes incorrectly raised.
Mark Dickinsonc4352b02008-05-09 13:55:01 +0000319
Georg Brandl52b92cc2008-05-25 09:43:03 +0000320- The ``--with-toolbox-glue`` option (and the associated
321 pymactoolbox.h) have been removed.
Benjamin Peterson79629ab2008-05-14 21:07:12 +0000322
Georg Brandl52b92cc2008-05-25 09:43:03 +0000323- Issue #2196: hasattr() now lets exceptions which do not inherit
324 Exception (KeyboardInterrupt, and SystemExit) propagate instead of
325 ignoring them.
Alexandre Vassalottieca20b62008-05-16 02:54:33 +0000326
Benjamin Petersoneec3d712008-06-11 15:59:43 +0000327- #3021 Exception reraising sematics have been significantly improved. However,
328 f_exc_type, f_exc_value, and f_exc_traceback cannot be accessed from Python
329 code anymore.
330
Benjamin Peterson4f92ca42008-06-11 20:21:57 +0000331- Three of PyNumberMethods' members, nb_coerce, nb_hex, and nb_oct, have been
332 removed.
333
Brett Cannon0d71ee72008-05-08 18:13:40 +0000334Extension Modules
335-----------------
336
Georg Brandl38feaf02008-05-25 07:45:51 +0000337- Renamed ``_winreg`` module to ``winreg``.
338
Georg Brandl52b92cc2008-05-25 09:43:03 +0000339- Support os.O_ASYNC and fcntl.FASYNC if the constants exist on the
340 platform.
Alexandre Vassalottibee32532008-05-16 18:15:12 +0000341
342- Support for Windows 9x has been removed from the winsound module.
343
Georg Brandl52b92cc2008-05-25 09:43:03 +0000344- Issue #2870: cmathmodule.c compile error.
Alexandre Vassalottieca20b62008-05-16 02:54:33 +0000345
Brett Cannon0d71ee72008-05-08 18:13:40 +0000346Library
347-------
348
Benjamin Peterson87069fd2008-08-20 02:00:14 +0000349- The methods ``is_in_tuple()``, ``is_vararg()``, and ``is_keywordarg()`` of
350 symtable.Symbol have been removed.
351
Amaury Forgeot d'Arccb0d2d72008-06-18 22:19:22 +0000352- Patch #3133: http.server.CGIHTTPRequestHandler did not work on windows.
353
Jeremy Hylton1afc1692008-06-18 20:49:58 +0000354- a new ``urllib`` package was created. It consists of code from
355 ``urllib``, ``urllib2``, ``urlparse``, and ``robotparser``. The old
356 modules have all been removed. The new package has five submodules:
357 ``urllib.parse``, ``urllib.request``, ``urllib.response``,
358 ``urllib.error``, and ``urllib.robotparser``. The
359 ``urllib.request.urlopen()`` function uses the url opener from
360 ``urllib2``. (Note that the unittests have not been renamed for the
361 beta, but they will be renamed in the future.)
362
Benjamin Petersona0c0a4a2008-06-12 22:15:50 +0000363- rfc822 has been removed in favor of the email package.
364
Benjamin Peterson425ea7f2008-06-12 14:11:35 +0000365- mimetools has been removed in favor of the email package.
Benjamin Peterson23c51a22008-06-12 14:06:57 +0000366
Barry Warsawf5019422008-06-12 02:42:00 +0000367- Patch #2849: Remove use of rfc822 module from standard library.
368
Alexandre Vassalotti794652d2008-06-11 22:58:36 +0000369- Added C optimized implementation of io.StringIO.
370
Alexandre Vassalottica2d6102008-06-12 18:26:05 +0000371- The ``pickle`` module is now automatically use an optimized C
372 implementation of Pickler and Unpickler when available. The
373 ``cPickle`` module is no longer needed.
374
Georg Brandl877b10a2008-06-01 21:25:55 +0000375- Removed the ``htmllib`` and ``sgmllib`` modules.
376
Georg Brandl61013952008-05-28 15:56:30 +0000377- The deprecated ``SmartCookie`` and ``SimpleCookie`` classes have
378 been removed from ``http.cookies``.
379
Brett Cannona23810f2008-05-26 19:04:21 +0000380- The ``commands`` module has been removed. Its getoutput() and
381 getstatusoutput() functions have been moved to the ``subprocess`` module.
382
Georg Brandl3d5c4252008-05-26 18:03:26 +0000383- The ``http`` package was created; it contains the old ``httplib``
384 as ``http.client``, ``Cookie`` as ``http.cookies``, ``cookielib``
385 as ``http.cookiejar``, and the content of the three ``HTTPServer``
386 modules as ``http.server``.
387
Georg Brandl38eceaa2008-05-26 11:14:17 +0000388- The ``xmlrpc`` package was created; it contains the old
389 ``xmlrpclib`` module as ``xmlrpc.client`` and the content of
390 the old ``SimpleXMLRPCServer`` and ``DocXMLRPCServer`` modules
Antoine Pitrou6e1df8d2008-07-25 19:58:18 +0000391 as ``xmlrpc.server``.
Georg Brandl38eceaa2008-05-26 11:14:17 +0000392
393- The ``dbm`` package was created, containing the old modules
394 ``anydbm`` and ``whichdb`` in its ``__init__.py``, and having
395 ``dbm.gnu`` (was ``gdbm``), ``dbm.bsd`` (was ``dbhash``),
396 ``dbm.ndbm`` (was ``dbm``) and ``dbm.dumb`` (was ``dumbdbm``)
397 as submodules.
398
Georg Brandl52b92cc2008-05-25 09:43:03 +0000399- The ``repr`` module has been renamed to ``reprlib``.
Alexandre Vassalotti1f2ba4b2008-05-16 07:12:44 +0000400
Georg Brandl52b92cc2008-05-25 09:43:03 +0000401- The ``statvfs`` module has been removed.
Brett Cannonacbb7862008-05-16 00:42:57 +0000402
Georg Brandl52b92cc2008-05-25 09:43:03 +0000403- Issue #1713041: fix pprint's handling of maximum depth.
Alexandre Vassalottieca20b62008-05-16 02:54:33 +0000404
Georg Brandl52b92cc2008-05-25 09:43:03 +0000405- Issue #2250: Exceptions raised during evaluation of names in
406 rlcompleter's ``Completer.complete()`` method are now caught and
407 ignored.
Alexandre Vassalotti8ae3e052008-05-16 00:41:41 +0000408
Georg Brandl52b92cc2008-05-25 09:43:03 +0000409- Patch #2659: Added ``break_on_hyphens`` option to textwrap's
410 ``TextWrapper`` class.
Alexandre Vassalotti1d1eaa42008-05-14 22:59:42 +0000411
Alexandre Vassalotti6461e102008-05-15 22:09:29 +0000412- Issue #2487: change the semantics of math.ldexp(x, n) when n is too
413 large to fit in a C long. ldexp(x, n) now returns a zero (with
414 suitable sign) if n is large and negative; previously, it raised
415 OverflowError.
416
Georg Brandl52b92cc2008-05-25 09:43:03 +0000417- The ``ConfigParser`` module has been renamed to ``configparser``.
Alexandre Vassalotti5f8ced22008-05-16 00:03:33 +0000418
Georg Brandl52b92cc2008-05-25 09:43:03 +0000419- Issue #2865: webbrowser.open() works again in a KDE environment.
Amaury Forgeot d'Arc2b2b44d2008-05-12 14:41:00 +0000420
Georg Brandl52b92cc2008-05-25 09:43:03 +0000421- The ``multifile`` module has been removed.
Brett Cannond3343cb2008-05-12 03:18:21 +0000422
Georg Brandl52b92cc2008-05-25 09:43:03 +0000423- The ``SocketServer`` module has been renamed to ``socketserver``.
Alexandre Vassalottice261952008-05-12 02:31:37 +0000424
Georg Brandl52b92cc2008-05-25 09:43:03 +0000425- Fixed the ``__all__`` setting on ``collections`` to include
426 ``UserList`` and ``UserString``.
Brett Cannon23a4a7b2008-05-12 00:56:28 +0000427
Brett Cannoncf3520c2008-05-11 22:47:58 +0000428- The sre module has been removed.
429
Alexandre Vassalottif260e442008-05-11 19:59:59 +0000430- The Queue module has been renamed to queue.
431
Alexandre Vassalottif7fa63d2008-05-11 08:55:36 +0000432- The copy_reg module has been renamed to copyreg.
433
Brett Cannond8b61ee2008-05-11 03:00:26 +0000434- The mhlib module has been removed.
435
Brett Cannonbd474422008-05-10 22:42:14 +0000436- The ihooks module has been removed.
437
Brett Cannonb59a2bd2008-05-10 22:03:16 +0000438- The fpformat module has been removed.
439
Brett Cannonf4fd9932008-05-10 21:11:46 +0000440- The dircache module has been removed.
441
Brett Cannond175b4c2008-05-10 03:19:54 +0000442- The Canvas module has been removed.
443
Mark Dickinsonb27406c2008-05-09 13:42:33 +0000444- The Decimal module gained the magic methods __round__, __ceil__,
445 __floor__ and __trunc__, to give support for round, math.ceil,
446 math.floor and math.trunc.
447
Brett Cannon900ee3a2008-05-08 20:31:11 +0000448- The user module has been removed.
449
Brett Cannon34afe872008-05-08 20:31:44 +0000450- The mutex module has been removed.
451
Brett Cannon0d71ee72008-05-08 18:13:40 +0000452- The imputil module has been removed.
453
Georg Brandl52b92cc2008-05-25 09:43:03 +0000454- os.path.walk has been removed in favor of os.walk.
Benjamin Petersond71ca412008-05-08 23:44:58 +0000455
Alexandre Vassalotti5f8ced22008-05-16 00:03:33 +0000456- pdb gained the "until" command.
457
Georg Brandl52b92cc2008-05-25 09:43:03 +0000458- The test.test_support module has been renamed to test.support.
Benjamin Petersonee8712c2008-05-20 21:35:26 +0000459
Georg Brandl32de7af2008-08-18 23:07:41 +0000460- The threading module API was renamed to be PEP 8 compliant. The
461 old names are still present, but will be removed in the near future.
Benjamin Peterson672b8032008-06-11 19:14:14 +0000462
Georg Brandl294d5a92008-06-01 19:25:32 +0000463Tools/Demos
464-----------
465
466- The bgen tool has been removed.
Benjamin Peterson630c8292008-06-01 18:50:38 +0000467
Brett Cannon0d71ee72008-05-08 18:13:40 +0000468Build
469-----
470
471
Barry Warsaw66079cd2008-04-04 01:36:36 +0000472What's New in Python 3.0a5?
473===========================
474
Barry Warsaw9eab8b02008-05-08 13:05:38 +0000475*Release date: 08-May-2008*
Barry Warsaw66079cd2008-04-04 01:36:36 +0000476
477Core and Builtins
478-----------------
479
Georg Brandl52b92cc2008-05-25 09:43:03 +0000480- Fixed misbehaviour of PyLong_FromSsize_t on systems where
481 sizeof(size_t) > sizeof(long).
Mark Dickinson7ab6be22008-04-15 21:42:42 +0000482
Georg Brandl52b92cc2008-05-25 09:43:03 +0000483- Issue #2221: Corrected a SystemError "error return without exception
484 set", when the code executed by exec() raises an exception, and
485 sys.stdout.flush() also raises an error.
Amaury Forgeot d'Arc7fedbe52008-04-10 21:03:09 +0000486
Georg Brandl52b92cc2008-05-25 09:43:03 +0000487- Bug #2565: The repr() of type objects now calls them 'class', not
488 'type' - whether they are builtin types or not.
Martin v. Löwis250ad612008-04-07 05:43:42 +0000489
Martin v. Löwis790465f2008-04-05 20:41:37 +0000490- The command line processing was converted to pass Unicode strings
491 through as unmodified as possible; as a consequence, the C API
492 related to command line arguments was changed to use wchar_t.
493
Georg Brandl52b92cc2008-05-25 09:43:03 +0000494- All backslashes in raw strings are interpreted literally. This
495 means that '\u' and '\U' escapes are not treated specially.
Benjamin Petersona2f837f2008-04-28 21:05:10 +0000496
Barry Warsaw66079cd2008-04-04 01:36:36 +0000497Extension Modules
498-----------------
499
500Library
501-------
502
Georg Brandl52b92cc2008-05-25 09:43:03 +0000503- ctypes objects now support the PEP3118 buffer interface.
Thomas Hellerb041fda2008-04-30 17:11:46 +0000504
Thomas Hellere106dc32008-04-24 18:39:36 +0000505- Issue #2682: ctypes callback functions now longer contain a cyclic
506 reference to themselves.
507
Georg Brandl52b92cc2008-05-25 09:43:03 +0000508- Issue #2058: Remove the buf attribute and add __slots__ to the
509 TarInfo class in order to reduce tarfile's memory usage.
Lars Gustäbelc2ea8c62008-04-14 10:05:48 +0000510
Martin v. Löwis8efc62c2008-04-10 19:02:25 +0000511- Bug #2606: Avoid calling .sort() on a dict_keys object.
512
Thomas Hellerbff533b2008-04-04 19:53:14 +0000513- The bundled libffi copy is now in sync with the recently released
514 libffi3.0.5 version, apart from some small changes to
515 Modules/_ctypes/libffi/configure.ac.
516
Thomas Hellerf44b9a12008-04-04 10:18:23 +0000517Build
518-----
519
Mark Dickinsonb0e2b4c2008-04-26 20:48:56 +0000520- Issue #1496032: On alpha, use -mieee when gcc is the compiler.
521
Guido van Rossumdc21db32008-04-07 18:37:41 +0000522- "make install" is now an alias for "make altinstall", to prevent
Georg Brandl52b92cc2008-05-25 09:43:03 +0000523 accidentally overwriting a Python 2.x installation. Use "make
524 fullinstall" to force Python 3.0 to be installed as "python".
Guido van Rossumdc21db32008-04-07 18:37:41 +0000525
Thomas Hellerf44b9a12008-04-04 10:18:23 +0000526- Issue #2544: On HP-UX systems, use 'gcc -shared' for linking when
527 gcc is used as compiler.
Barry Warsaw66079cd2008-04-04 01:36:36 +0000528
Georg Brandl52b92cc2008-05-25 09:43:03 +0000529
Barry Warsawa9d499d2008-03-01 18:38:07 +0000530What's New in Python 3.0a4?
531===========================
532
Barry Warsawbb5cd082008-04-02 23:33:27 +0000533*Release date: 02-Apr-2008*
Barry Warsawa9d499d2008-03-01 18:38:07 +0000534
Martin v. Löwis25931462008-03-17 20:43:42 +0000535Core and Builtins
536-----------------
537
538- Bug #2301: Don't try decoding the source code into the original
539 encoding for syntax errors.
540
Martin v. Löwis92fab752008-03-08 10:40:41 +0000541Extension Modules
542-----------------
543
Neal Norwitz6cf49cf2008-03-24 06:22:57 +0000544- The dl module was removed, use the ctypes module instead.
545
Martin v. Löwis92fab752008-03-08 10:40:41 +0000546- Use wchar_t functions in _locale module.
Barry Warsawa9d499d2008-03-01 18:38:07 +0000547
Martin v. Löwis071ef772008-03-08 11:24:24 +0000548Library
549-------
550
Georg Brandl52b92cc2008-05-25 09:43:03 +0000551- The class distutils.commands.build_py.build_py_2to3 can be used as a
552 build_py replacement to automatically run 2to3 on modules that are
553 going to be installed.
Martin v. Löwis73a22f02008-03-22 00:35:10 +0000554
Guido van Rossumf4169812008-03-17 22:56:06 +0000555- A new pickle protocol (protocol 3) is added with explicit support
556 for bytes. This is the default protocol. It intentionally cannot
557 be unpickled by Python 2.x.
558
559- When a pickle written by Python 2.x contains an (8-bit) str
560 instance, this is now decoded to a (Unicode) str instance. The
561 encoding used to do this defaults to ASCII, but can be overridden
562 via two new keyword arguments to the Unpickler class. Previously
563 this would create bytes instances, which is usually wrong: str
564 instances are often used to pickle attribute names etc., and text is
565 more common than binary data anyway.
566
Martin v. Löwis071ef772008-03-08 11:24:24 +0000567- Default to ASCII as the locale.getpreferredencoding, if the POSIX
Georg Brandl52b92cc2008-05-25 09:43:03 +0000568 system doesn't support CODESET and LANG isn't set or doesn't allow
569 deduction of an encoding.
Martin v. Löwis071ef772008-03-08 11:24:24 +0000570
Georg Brandl52b92cc2008-05-25 09:43:03 +0000571- Issue #1202: zlib.crc32 and zlib.adler32 now return an unsigned
572 value.
Gregory P. Smith425136b2008-03-17 20:45:21 +0000573
Georg Brandl52b92cc2008-05-25 09:43:03 +0000574- Issue #719888: Updated tokenize to use a bytes API. generate_tokens
575 has been renamed tokenize and now works with bytes rather than
576 strings. A new detect_encoding function has been added for
577 determining source file encoding according to PEP-0263. Token
578 sequences returned by tokenize always start with an ENCODING token
579 which specifies the encoding used to decode the file. This token is
580 used to encode the output of untokenize back to bytes.
581
Barry Warsawa9d499d2008-03-01 18:38:07 +0000582
Christian Heimesbc873412007-12-08 22:11:32 +0000583What's New in Python 3.0a3?
584===========================
585
Barry Warsaw659fc422008-03-01 17:45:23 +0000586*Release date: 29-Feb-2008*
Christian Heimesbc873412007-12-08 22:11:32 +0000587
588Core and Builtins
589-----------------
590
Georg Brandl52b92cc2008-05-25 09:43:03 +0000591- Issue #2282: io.TextIOWrapper was not overriding seekable() from
592 io.IOBase.
Ka-Ping Yeeddaa7062008-03-17 20:35:15 +0000593
Georg Brandl52b92cc2008-05-25 09:43:03 +0000594- Issue #2115: Important speedup in setting __slot__ attributes. Also
595 prevent a possible crash: an Abstract Base Class would try to access
596 a slot on a registered virtual subclass.
Christian Heimesa156e092008-02-16 07:38:31 +0000597
Georg Brandl52b92cc2008-05-25 09:43:03 +0000598- Fixed repr() and str() of complex numbers with infinity or nan as
599 real or imaginary part.
Christian Heimesa156e092008-02-16 07:38:31 +0000600
Georg Brandl52b92cc2008-05-25 09:43:03 +0000601- Clear all free list during a gc.collect() of the highest generation
602 in order to allow pymalloc to free more arenas. Python may give back
603 memory to the OS earlier.
Christian Heimesa156e092008-02-16 07:38:31 +0000604
Georg Brandl52b92cc2008-05-25 09:43:03 +0000605- Issue #2045: Fix an infinite recursion triggered when printing a
606 subclass of collections.defaultdict, if its default_factory is set
607 to a bound method.
Christian Heimesa156e092008-02-16 07:38:31 +0000608
609- Fixed a minor memory leak in dictobject.c. The content of the free
610 list was not freed on interpreter shutdown.
611
Georg Brandl52b92cc2008-05-25 09:43:03 +0000612- Limit free list of method and builtin function objects to 256
613 entries each.
Christian Heimesa156e092008-02-16 07:38:31 +0000614
Georg Brandl52b92cc2008-05-25 09:43:03 +0000615- Patch #1953: Added ``sys._compact_freelists()`` and the C API
616 functions ``PyInt_CompactFreeList`` and ``PyFloat_CompactFreeList``
Christian Heimesa156e092008-02-16 07:38:31 +0000617 to compact the internal free lists of pre-allocted ints and floats.
618
619- Bug #1983: Fixed return type of fork(), fork1() and forkpty() calls.
Georg Brandl52b92cc2008-05-25 09:43:03 +0000620 Python expected the return type int but the fork familie returns
621 pi_t.
Christian Heimesa156e092008-02-16 07:38:31 +0000622
Georg Brandl52b92cc2008-05-25 09:43:03 +0000623- Issue #1678380: Fix a bug that identifies 0j and -0j when they
624 appear in the same code unit.
Christian Heimesa156e092008-02-16 07:38:31 +0000625
Georg Brandl52b92cc2008-05-25 09:43:03 +0000626- Issue #2025: Added tuple.count() and tuple.index() methods to comply
627 with the collections.Sequence API.
Raymond Hettinger65baa342008-02-07 00:41:02 +0000628
Georg Brandl52b92cc2008-05-25 09:43:03 +0000629- Fixed multiple reinitialization of the Python interpreter. The small
630 int list in longobject.c has caused a seg fault during the third
631 finalization.
Christian Heimesdfc12ed2008-01-31 15:16:38 +0000632
Georg Brandl52b92cc2008-05-25 09:43:03 +0000633- Issue #1973: bytes.fromhex('') raised SystemError.
Christian Heimesc04dac02008-01-30 11:27:57 +0000634
Georg Brandl52b92cc2008-05-25 09:43:03 +0000635- Issue #1771: remove cmp parameter from sorted() and list.sort().
Raymond Hettinger70b64fc2008-01-30 20:15:17 +0000636
Georg Brandl52b92cc2008-05-25 09:43:03 +0000637- Issue #1969: split and rsplit in bytearray are inconsistent.
Christian Heimes7b876152008-01-30 09:51:48 +0000638
Georg Brandl52b92cc2008-05-25 09:43:03 +0000639- map() no longer accepts None for the first argument. Use zip()
640 instead.
Raymond Hettinger1dfde1d2008-01-22 23:25:35 +0000641
Facundo Batista2336bdd2008-01-19 19:12:01 +0000642- Issue #1769: Now int("- 1") is not allowed any more.
643
Georg Brandl52b92cc2008-05-25 09:43:03 +0000644- Object/longobject.c: long(float('nan')) raises an OverflowError
645 instead of returning 0.
Christian Heimes386cd1e2008-01-15 02:01:20 +0000646
Georg Brandl52b92cc2008-05-25 09:43:03 +0000647- Issue #1762972: __file__ points to the source file instead of the
648 pyc/pyo file if the py file exists.
Christian Heimes3b06e532008-01-07 20:12:44 +0000649
Guido van Rossumab078dd2008-01-06 00:09:11 +0000650- Issue #1393: object_richcompare() returns NotImplemented instead of
651 False if the objects aren't equal, to give the other side a chance.
652
Guido van Rossume239b002008-01-06 00:44:20 +0000653- Issue #1692: Interpreter was not displaying location of SyntaxError.
Kurt B. Kaiser43b15092008-01-05 04:32:22 +0000654
Georg Brandl52b92cc2008-05-25 09:43:03 +0000655- Improve some exception messages when Windows fails to load an
656 extension module. Now we get for example '%1 is not a valid Win32
657 application' instead of 'error code 193'. Also use Unicode strings
658 to deal with non-English locales.
Amaury Forgeot d'Arcbccd63c2008-01-04 01:21:27 +0000659
Georg Brandl52b92cc2008-05-25 09:43:03 +0000660- Issue #1587: Added instancemethod wrapper for PyCFunctions. The
661 Python C API has gained a new type *PyInstanceMethod_Type* and the
662 functions *PyInstanceMethod_Check(o)*, *PyInstanceMethod_New(func)*
663 and *PyInstanceMethod_Function(im)*.
Christian Heimesa3534a62007-12-11 19:56:40 +0000664
Georg Brandl52b92cc2008-05-25 09:43:03 +0000665- Constants gc.DEBUG_OBJECT and gc.DEBUG_INSTANCE have been removed
666 from the gc module; gc.DEBUG_COLLECTABLE or gc.DEBUG_UNCOLLECTABLE
667 are now enough to print the corresponding list of objects considered
668 by the garbage collector.
Amaury Forgeot d'Arcad8dcd52007-12-10 23:58:35 +0000669
Georg Brandl52b92cc2008-05-25 09:43:03 +0000670- Issue #1573: Improper use of the keyword-only syntax makes the
671 parser crash.
Christian Heimesbc873412007-12-08 22:11:32 +0000672
Georg Brandl52b92cc2008-05-25 09:43:03 +0000673- Issue #1564: The set implementation should special-case PyUnicode
674 instead of PyString.
Christian Heimes0ded5b52007-12-10 15:50:56 +0000675
Guido van Rossumea6775b2008-02-21 20:16:31 +0000676- Patch #1031213: Decode source line in SyntaxErrors back to its
677 original source encoding.
Christian Heimes7131fd92008-02-19 14:21:46 +0000678
Christian Heimes09aaa882008-02-23 15:01:06 +0000679- inspect.getsource() includes the decorators again.
680
Guido van Rossumea6775b2008-02-21 20:16:31 +0000681- Bug #1713: posixpath.ismount() claims symlink to a mountpoint is a
682 mountpoint.
Christian Heimes7131fd92008-02-19 14:21:46 +0000683
Georg Brandl52b92cc2008-05-25 09:43:03 +0000684- Fix utf-8-sig incremental decoder, which didn't recognise a BOM when
685 the first chunk fed to the decoder started with a BOM, but was
686 longer than 3 bytes.
Christian Heimes7131fd92008-02-19 14:21:46 +0000687
Christian Heimesbc873412007-12-08 22:11:32 +0000688Extension Modules
689-----------------
690
Georg Brandl52b92cc2008-05-25 09:43:03 +0000691- Code for itertools ifilter(), imap(), and izip() moved to bultins
692 and renamed to filter(), map(), and zip(). Also, renamed
693 izip_longest() to zip_longest() and ifilterfalse() to filterfalse().
Raymond Hettinger736c0ab2008-03-13 02:09:15 +0000694
Georg Brandl52b92cc2008-05-25 09:43:03 +0000695- Issue #1762972: Readded the reload() function as imp.reload().
Guido van Rossumea6775b2008-02-21 20:16:31 +0000696
Georg Brandl52b92cc2008-05-25 09:43:03 +0000697- Bug #2111: mmap segfaults when trying to write a block opened with
698 PROT_READ.
Christian Heimesa156e092008-02-16 07:38:31 +0000699
Georg Brandl52b92cc2008-05-25 09:43:03 +0000700- Issue #2063: correct order of utime and stime in os.times() result
701 on Windows.
Christian Heimes7131fd92008-02-19 14:21:46 +0000702
Christian Heimesbc873412007-12-08 22:11:32 +0000703Library
704-------
705
Raymond Hettinger48b8b662008-02-05 01:53:00 +0000706- Weakref dictionaries now inherit from MutableMapping.
Raymond Hettinger48b8b662008-02-05 01:53:00 +0000707
Georg Brandl52b92cc2008-05-25 09:43:03 +0000708- Created new UserDict class in collections module. This one inherits
709 from and complies with the MutableMapping ABC. Also, moved
710 UserString and UserList to the collections module. The
711 MutableUserString class was removed.
Raymond Hettinger48b8b662008-02-05 01:53:00 +0000712
Guido van Rossumea6775b2008-02-21 20:16:31 +0000713- Removed UserDict.DictMixin. Replaced all its uses with
714 collections.MutableMapping.
Raymond Hettingeredf3b732008-02-04 22:07:15 +0000715
Guido van Rossume239b002008-01-06 00:44:20 +0000716- Issue #1703: getpass() should flush after writing prompt.
Christian Heimesfc5aa9d2007-12-11 09:00:01 +0000717
Guido van Rossume239b002008-01-06 00:44:20 +0000718- Issue #1585: IDLE uses non-existent xrange() function.
719
720- Issue #1578: Problems in win_getpass.
721
Georg Brandl52d168a2008-01-07 18:10:24 +0000722Build
723-----
724
Georg Brandl52b92cc2008-05-25 09:43:03 +0000725- Renamed --enable-unicode configure flag to --with-wide-unicode,
726 since Unicode strings can't be disabled anymore.
Georg Brandl52d168a2008-01-07 18:10:24 +0000727
Guido van Rossume239b002008-01-06 00:44:20 +0000728C API
729-----
730
731- Issue #1629: Renamed Py_Size, Py_Type and Py_Refcnt to Py_SIZE,
732 Py_TYPE and Py_REFCNT.
733
Georg Brandl52b92cc2008-05-25 09:43:03 +0000734- New API PyImport_ImportModuleNoBlock(), works like
735 PyImport_ImportModule() but won't block on the import lock
736 (returning an error instead).
Christian Heimes0ec88b32007-12-10 17:02:00 +0000737
Christian Heimesbc873412007-12-08 22:11:32 +0000738
Fred Drake0e474a82007-10-11 18:01:43 +0000739What's New in Python 3.0a2?
Christian Heimesbc873412007-12-08 22:11:32 +0000740===========================
Fred Drake0e474a82007-10-11 18:01:43 +0000741
Guido van Rossum99533a92007-12-06 05:07:41 +0000742*Release date: 07-Dec-2007*
743
744(Note: this list is incomplete.)
Fred Drake0e474a82007-10-11 18:01:43 +0000745
Guido van Rossum40d20bc2007-10-22 00:09:51 +0000746Core and Builtins
747-----------------
748
Brett Cannon37f7e6e2007-10-26 05:42:09 +0000749- str8 now has the same construction signature as bytes.
750
Georg Brandl52b92cc2008-05-25 09:43:03 +0000751- Comparisons between str and str8 now return False/True for ==/!=.
752 sqlite3 returns str8 when recreating on object from it's __conform__
753 value. The struct module returns str8 for all string-related
754 formats. This was true before this change, but becomes more
755 apparent thanks to string comparisons always being False.
Brett Cannon40430012007-10-22 20:24:51 +0000756
Georg Brandl52b92cc2008-05-25 09:43:03 +0000757- Replaced `PyFile_FromFile()` with `PyFile_FromFd(fd, name. mode,
758 buffer, encoding, newline)`.
Guido van Rossum40d20bc2007-10-22 00:09:51 +0000759
760- Fixed `imp.find_module()` to obey the -*- coding: -*- header.
761
762- Changed `__file__` and `co_filename` to unicode. The path names are decoded
Antoine Pitrou6e1df8d2008-07-25 19:58:18 +0000763 with `Py_FileSystemDefaultEncoding` and a new API method
Guido van Rossum40d20bc2007-10-22 00:09:51 +0000764 `PyUnicode_DecodeFSDefault(char*)` was added.
765
Georg Brandl52b92cc2008-05-25 09:43:03 +0000766- io.open() and _fileio.FileIO have grown a new argument closefd. A
767 false value disables the closing of the file descriptor.
Guido van Rossum2dced8b2007-10-30 17:27:30 +0000768
Georg Brandl52b92cc2008-05-25 09:43:03 +0000769- Added a new option -b to issues warnings (-bb for errors) about
770 certain operations between bytes/buffer and str like str(b'') and
771 comparison.
Guido van Rossum98297ee2007-11-06 21:34:58 +0000772
Georg Brandl52b92cc2008-05-25 09:43:03 +0000773- The standards streams sys.stdin, stdout and stderr may be None when
774 the when the C runtime library returns an invalid file descriptor
775 for the streams (fileno(stdin) < 0). For now this happens only for
776 Windows GUI apps and scripts started with `pythonw.exe`.
Christian Heimes58cb1b82007-11-13 02:19:40 +0000777
Christian Heimesbce52be2007-11-17 19:08:41 +0000778- Added PCbuild9 directory for VS 2008.
779
Georg Brandl52b92cc2008-05-25 09:43:03 +0000780- Renamed structmember.h WRITE_RESTRICTED to PY_WRITE_RESTRICTED to
781 work around a name clash with VS 2008 on Windows.
Christian Heimesbce52be2007-11-17 19:08:41 +0000782
Georg Brandl52b92cc2008-05-25 09:43:03 +0000783- Unbound methods are gone for good. ClassObject.method returns an
784 ordinary function object, instance.method still returns a bound
785 method object. The API of bound methods is cleaned up, too. The
786 im_class attribute is removed and im_func + im_self are renamed to
787 __func__ and __self__. The factory PyMethod_New takes only func and
788 instance as argument.
Christian Heimesff737952007-11-27 10:40:20 +0000789
Georg Brandl52b92cc2008-05-25 09:43:03 +0000790- intobject.h is no longer included by Python.h. The remains were
791 moved to longobject.h. It still exists to define several aliases
792 from PyInt_ to PyLong_ functions.
Christian Heimesf78b1c62007-12-02 16:52:32 +0000793
Christian Heimesa37d4c62007-12-04 23:02:19 +0000794- Removed sys.maxint, use sys.maxsize instead.
795
Fred Drake0e474a82007-10-11 18:01:43 +0000796Extension Modules
797-----------------
798
799- The `hotshot` profiler has been removed; use `cProfile` instead.
800
Brett Cannone9fd2312007-10-12 19:18:19 +0000801Library
802-------
803
Georg Brandl52b92cc2008-05-25 09:43:03 +0000804- When loading an external file using testfile(), the passed-in
805 encoding argument was being ignored if __loader__ is defined and
806 forcing the source to be UTF-8.
Brett Cannone9fd2312007-10-12 19:18:19 +0000807
Georg Brandl52b92cc2008-05-25 09:43:03 +0000808- The methods `os.tmpnam()`, `os.tempnam()` and `os.tmpfile()` have
809 been removed in favor of the tempfile module.
Guido van Rossum687b9c02007-10-25 23:18:51 +0000810
Christian Heimesc9543e42007-11-28 08:28:28 +0000811- Removed the 'new' module.
812
Georg Brandl52b92cc2008-05-25 09:43:03 +0000813- Removed all types from the 'types' module that are easily accessable
814 through builtins.
Brett Cannone9fd2312007-10-12 19:18:19 +0000815
Georg Brandl52d168a2008-01-07 18:10:24 +0000816
Guido van Rossum4405cf32007-08-30 17:16:55 +0000817What's New in Python 3.0a1?
Guido van Rossum45aecf42006-03-15 04:58:47 +0000818==========================
Thomas Wouters4d70c3d2006-06-08 14:42:34 +0000819
Guido van Rossum4405cf32007-08-30 17:16:55 +0000820*Release date: 31-Aug-2007*
Neal Norwitz4886cc32006-08-21 17:06:07 +0000821
822Core and Builtins
823-----------------
824
Martin v. Löwis47383402007-08-15 07:32:56 +0000825- PEP 3131: Support non-ASCII identifiers.
826
Martin v. Löwis447d33e2007-07-29 18:10:01 +0000827- PEP 3120: Change default encoding to UTF-8.
828
Martin v. Löwis9f2e3462007-07-21 17:22:18 +0000829- PEP 3123: Use proper C inheritance for PyObject.
830
Guido van Rossumcd16bf62007-06-13 18:07:49 +0000831- Removed the __oct__ and __hex__ special methods and added a bin()
832 builtin function.
833
Georg Brandl52b92cc2008-05-25 09:43:03 +0000834- PEP 3127: octal literals now start with "0o". Old-style octal
835 literals are invalid. There are binary literals with a prefix of
836 "0b". This also affects int(x, 0).
Guido van Rossumcd16bf62007-06-13 18:07:49 +0000837
Guido van Rossume7ba4952007-06-06 23:52:48 +0000838- None, True, False are now keywords.
839
Guido van Rossum29478ef2007-05-29 00:39:44 +0000840- PEP 3119: isinstance() and issubclass() can be overridden.
841
Guido van Rossumebe3e162007-05-17 18:20:34 +0000842- Remove BaseException.message.
843
Guido van Rossum1bc535d2007-05-15 18:46:22 +0000844- Remove tuple parameter unpacking (PEP 3113).
845
Georg Brandl52b92cc2008-05-25 09:43:03 +0000846- Remove the f_restricted attribute from frames. This naturally leads
847 to the removal of PyEval_GetRestricted() and PyFrame_IsRestricted().
Guido van Rossuma8add0e2007-05-14 22:03:55 +0000848
Georg Brandl52b92cc2008-05-25 09:43:03 +0000849- PEP 3132 was accepted. That means that you can do ``a, *b =
850 range(5)`` to assign 0 to a and [1, 2, 3, 4] to b.
Guido van Rossum0368b722007-05-11 16:50:42 +0000851
Georg Brandl52b92cc2008-05-25 09:43:03 +0000852- range() now returns an iterator rather than a list. Floats are not
853 allowed. xrange() is no longer defined.
Guido van Rossum805365e2007-05-07 22:24:25 +0000854
Nick Coghlan650f0d02007-04-15 12:05:43 +0000855- Patch #1660500: hide iteration variable in list comps, add set comps
Georg Brandl52b92cc2008-05-25 09:43:03 +0000856 and use common code to handle compilation of iterative expressions.
Nick Coghlan650f0d02007-04-15 12:05:43 +0000857
Guido van Rossume27dc722007-03-27 22:37:34 +0000858- By default, != returns the opposite of ==, unless the latter returns
859 NotImplemented.
860
Georg Brandl52b92cc2008-05-25 09:43:03 +0000861- Patch #1680961: sys.exitfunc has been removed and replaced with a
862 private C-level API.
Collin Winter670e6922007-03-21 02:57:17 +0000863
Georg Brandl801dd732007-03-18 20:18:31 +0000864- PEP 3115: new metaclasses: the metaclass is now specified as a
Georg Brandl52b92cc2008-05-25 09:43:03 +0000865 keyword arg in the class statement, which can now use the full
866 syntax of a parameter list. Also, the metaclass can implement a
867 __prepare__ function which will be called to create the dictionary
868 for the new class namespace.
Georg Brandl801dd732007-03-18 20:18:31 +0000869
Georg Brandl428f0642007-03-18 18:35:15 +0000870- The long-deprecated argument "pend" of PyFloat_FromString() has been
871 removed.
872
Georg Brandle32b4222007-03-10 22:13:27 +0000873- The dir() function has been extended to call the __dir__() method on
Georg Brandl52b92cc2008-05-25 09:43:03 +0000874 its argument, if it exists. If not, it will work like before. This
875 allows customizing the output of dir() in the presence of a
876 __getattr__().
Brett Cannonba7bf492007-02-27 00:15:55 +0000877
Neal Norwitz8dfc4a92007-08-11 06:39:53 +0000878- Removed support for __members__ and __methods__.
879
Georg Brandle32b4222007-03-10 22:13:27 +0000880- Removed indexing/slicing on BaseException.
Neal Norwitz2633c692007-02-26 22:22:47 +0000881
Georg Brandle32b4222007-03-10 22:13:27 +0000882- input() became raw_input(): the name input() now implements the
Georg Brandl52b92cc2008-05-25 09:43:03 +0000883 functionality formerly known as raw_input(); the name raw_input() is
884 no longer defined.
Guido van Rossum0240b922007-02-26 21:23:50 +0000885
Georg Brandl52b92cc2008-05-25 09:43:03 +0000886- Classes listed in an 'except' clause must inherit from
887 BaseException.
Brett Cannonf74225d2007-02-26 21:10:16 +0000888
Guido van Rossumcc2b0162007-02-11 06:12:03 +0000889- PEP 3106: dict.iterkeys(), .iteritems(), .itervalues() are now gone;
Guido van Rossumcf1be882007-08-30 22:07:17 +0000890 and .keys(), .items(), .values() return dict views, which behave
891 like sets.
Guido van Rossumcc2b0162007-02-11 06:12:03 +0000892
Guido van Rossum8b545362007-02-09 23:52:14 +0000893- PEP 3105: print is now a function. Also (not in the PEP) the
Georg Brandl52b92cc2008-05-25 09:43:03 +0000894 'softspace' attribute of files is now gone (since print() doesn't
895 use it). A side effect of this change is that you can get
896 incomplete output lines in interactive sessions:
Guido van Rossum8b545362007-02-09 23:52:14 +0000897
898 >>> print(42, end="")
Kurt B. Kaiser2c7f3142007-08-30 21:52:19 +0000899 42>>>
Guido van Rossum8b545362007-02-09 23:52:14 +0000900
901 We may be able to fix this after the I/O library rewrite.
Guido van Rossum4502c802007-02-09 05:42:38 +0000902
Brett Cannon398db8b2007-01-29 23:44:37 +0000903- PEP 3102: keyword-only arguments.
904
Georg Brandl52b92cc2008-05-25 09:43:03 +0000905- Int/Long unification is complete. The 'long' built-in type and
906 literals with trailing 'L' or 'l' have been removed. Performance
907 may be sub-optimal (haven't really benchmarked).
Guido van Rossumab186842007-01-14 03:42:30 +0000908
909- 'except E, V' must now be spelled as 'except E as V' and deletes V
910 at the end of the except clause; V must be a simple name.
911
Neal Norwitzc1505362006-12-28 06:47:50 +0000912- Added function annotations per PEP 3107.
913
Georg Brandl52b92cc2008-05-25 09:43:03 +0000914- Added nonlocal declaration from PEP 3104:
Jeremy Hyltona4f9fc62007-02-27 15:53:28 +0000915
916 >>> def f(x):
917 ... def inc():
918 ... nonlocal x
919 ... x += 1
920 ... return x
921 ... return inc
922 ...
923 >>> inc = f(0)
924 >>> inc()
925 1
926 >>> inc()
927 2
928
Georg Brandl66a796e2006-12-19 20:50:34 +0000929- Moved intern() to sys.intern().
930
931- exec is now a function.
932
933- Renamed nb_nonzero to nb_bool and __nonzero__ to __bool__.
Jack Diederich4dafcc42006-11-28 19:15:13 +0000934
Neal Norwitz4886cc32006-08-21 17:06:07 +0000935- Classic classes are a thing of the past. All classes are new style.
936
937- Exceptions *must* derive from BaseException.
938
939- Integer division always returns a float. The -Q option is no more.
940 All the following are gone:
941 * PyNumber_Divide and PyNumber_InPlaceDivide
942 * __div__, __rdiv__, and __idiv__
943 * nb_divide, nb_inplace_divide
944 * operator.div, operator.idiv, operator.__div__, operator.__idiv__
945 (Only __truediv__ and __floordiv__ remain, not sure how to handle them
946 if we want to re-use __div__ and friends. If we do, it will make
947 it harder to write code for both 2.x and 3.x.)
948
949- 'as' and 'with' are keywords.
950
951- Absolute import is the default behavior for 'import foo' etc.
952
Georg Brandl52b92cc2008-05-25 09:43:03 +0000953- Removed support for syntax: backticks (ie, `x`), <>.
Neal Norwitz378b2c92006-08-29 07:57:22 +0000954
Georg Brandl52b92cc2008-05-25 09:43:03 +0000955- Removed these Python builtins: apply(), callable(), coerce(),
956 execfile(), file(), reduce(), reload().
Neal Norwitz4886cc32006-08-21 17:06:07 +0000957
Georg Brandl52b92cc2008-05-25 09:43:03 +0000958- Removed these Python methods: {}.has_key.
Neal Norwitz378b2c92006-08-29 07:57:22 +0000959
Georg Brandl52b92cc2008-05-25 09:43:03 +0000960- Removed these opcodes: BINARY_DIVIDE, INPLACE_DIVIDE, UNARY_CONVERT.
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000961
962- Remove C API support for restricted execution.
963
Guido van Rossumcf1be882007-08-30 22:07:17 +0000964- zip(), map() and filter() now return iterators, behaving like their
Georg Brandl52b92cc2008-05-25 09:43:03 +0000965 itertools counterparts. This also affect map()'s behavior on
Guido van Rossumcf1be882007-08-30 22:07:17 +0000966 sequences of unequal length -- it now stops after the shortest one
967 is exhausted.
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000968
Georg Brandl52b92cc2008-05-25 09:43:03 +0000969- Additions: set literals, set comprehensions, ellipsis literal.
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000970
971- Added class decorators per PEP 3129.
972
973
974Extension Modules
975-----------------
976
Georg Brandl52b92cc2008-05-25 09:43:03 +0000977- Removed the imageop module. Obsolete long with its unit tests
978 becoming useless from the removal of rgbimg and imgfile.
Neal Norwitz4886cc32006-08-21 17:06:07 +0000979
Georg Brandl52b92cc2008-05-25 09:43:03 +0000980- Removed these attributes from the operator module: div, idiv,
981 __div__, __idiv__, isCallable, sequenceIncludes.
982
983- Removed these attributes from the sys module: exc_clear(), exc_type,
984 exc_value, exc_traceback.
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000985
986
987Library
988-------
989
Georg Brandl52b92cc2008-05-25 09:43:03 +0000990- Removed the compiler package. Use of the _ast module and (an
991 eventual) AST -> bytecode mechanism.
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000992
Georg Brandl52b92cc2008-05-25 09:43:03 +0000993- Removed these modules: audiodev, Bastion, bsddb185, exceptions,
994 linuxaudiodev, md5, MimeWriter, mimify, popen2, rexec, sets, sha,
995 stringold, strop, sunaudiodev, timing, xmllib.
Guido van Rossum33d26892007-08-05 15:29:28 +0000996
Georg Brandl52b92cc2008-05-25 09:43:03 +0000997- Moved the toaiff module to Tools/Demos.
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000998
Georg Brandl52b92cc2008-05-25 09:43:03 +0000999- Removed obsolete IRIX modules: al/AL, cd/CD, cddb, cdplayer, cl/CL,
1000 DEVICE, ERRNO, FILE, fl/FL, flp, fm, GET, gl/GL, GLWS, IN, imgfile,
1001 IOCTL, jpeg, panel, panelparser, readcd, sgi, sv/SV, torgb, WAIT.
Guido van Rossumd59da4b2007-05-22 18:11:13 +00001002
Georg Brandl52b92cc2008-05-25 09:43:03 +00001003- Removed obsolete functions: commands.getstatus(), os.popen*().
Guido van Rossumd59da4b2007-05-22 18:11:13 +00001004
Georg Brandl52b92cc2008-05-25 09:43:03 +00001005- Removed functions in the string module that are also string methods;
Martin v. Löwis967f1e32007-08-14 09:23:10 +00001006 Remove string.{letters, lowercase, uppercase}.
Guido van Rossumd59da4b2007-05-22 18:11:13 +00001007
Georg Brandl52b92cc2008-05-25 09:43:03 +00001008- Removed support for long obsolete platforms: plat-aix3, plat-irix5.
Guido van Rossumd59da4b2007-05-22 18:11:13 +00001009
Georg Brandl52b92cc2008-05-25 09:43:03 +00001010- Removed xmlrpclib.SlowParser. It was based on xmllib.
Guido van Rossumd59da4b2007-05-22 18:11:13 +00001011
1012- Patch #1680961: atexit has been reimplemented in C.
1013
Walter Dörwald41980ca2007-08-16 21:55:45 +00001014- Add new codecs for UTF-32, UTF-32-LE and UTF-32-BE.
1015
Guido van Rossumd59da4b2007-05-22 18:11:13 +00001016Build
1017-----
1018
1019C API
1020-----
1021
Georg Brandl52b92cc2008-05-25 09:43:03 +00001022- Removed these Python slots: __coerce__, __div__, __idiv__, __rdiv__.
Neal Norwitz4886cc32006-08-21 17:06:07 +00001023
Georg Brandl52b92cc2008-05-25 09:43:03 +00001024- Removed these C APIs: PyNumber_Coerce(), PyNumber_CoerceEx(),
1025 PyMember_Get, PyMember_Set.
Neal Norwitz4886cc32006-08-21 17:06:07 +00001026
Georg Brandl52b92cc2008-05-25 09:43:03 +00001027- Removed these C slots/fields: nb_divide, nb_inplace_divide.
Neal Norwitz4886cc32006-08-21 17:06:07 +00001028
Georg Brandl52b92cc2008-05-25 09:43:03 +00001029- Removed these macros: staticforward, statichere, PyArg_GetInt,
1030 PyArg_NoArgs, _PyObject_Del.
Neal Norwitz4886cc32006-08-21 17:06:07 +00001031
Georg Brandl52b92cc2008-05-25 09:43:03 +00001032- Removed these typedefs: intargfunc, intintargfunc, intobjargproc,
1033 intintobjargproc, getreadbufferproc, getwritebufferproc,
1034 getsegcountproc, getcharbufferproc, memberlist.
Raymond Hettinger4901a1f2004-12-02 08:59:14 +00001035
Raymond Hettinger4901a1f2004-12-02 08:59:14 +00001036Tests
1037-----
1038
Brett Cannone7a30f72008-03-03 03:36:27 +00001039- Removed test.testall as test.regrtest replaces it.
1040
Brett Cannonced04e02005-02-13 22:53:22 +00001041Documentation
1042-------------
1043
Raymond Hettinger4901a1f2004-12-02 08:59:14 +00001044Mac
1045---
1046
Georg Brandl52b92cc2008-05-25 09:43:03 +00001047- The cfmfile module was removed.
Guido van Rossume7ba4952007-06-06 23:52:48 +00001048
Guido van Rossum845702c2007-08-30 18:44:53 +00001049Platforms
1050---------
1051
1052- Support for BeOS and AtheOS was removed (according to PEP 11).
1053
1054- Support for RiscOS, Irix, Tru64 was removed (alledgedly).
1055
Raymond Hettinger4901a1f2004-12-02 08:59:14 +00001056Tools/Demos
1057-----------
1058
Georg Brandl52b92cc2008-05-25 09:43:03 +00001059
Skip Montanaroe5d7f7f2002-09-20 14:16:59 +00001060**(For information about older versions, consult the HISTORY file.)**