Giampaolo Rodolà | 3108f98 | 2011-02-24 20:59:48 +0000 | [diff] [blame] | 1 | **************************** |
| 2 | What's New In Python 3.3 |
| 3 | **************************** |
| 4 | |
| 5 | :Author: Raymond Hettinger |
| 6 | :Release: |release| |
| 7 | :Date: |today| |
| 8 | |
Éric Araujo | b07b97f | 2011-10-05 01:03:34 +0200 | [diff] [blame^] | 9 | .. Rules for maintenance: |
Giampaolo Rodolà | 3108f98 | 2011-02-24 20:59:48 +0000 | [diff] [blame] | 10 | |
| 11 | * Anyone can add text to this document. Do not spend very much time |
| 12 | on the wording of your changes, because your text will probably |
| 13 | get rewritten to some degree. |
| 14 | |
| 15 | * The maintainer will go through Misc/NEWS periodically and add |
| 16 | changes; it's therefore more important to add your changes to |
| 17 | Misc/NEWS than to this file. |
| 18 | |
| 19 | * This is not a complete list of every single change; completeness |
| 20 | is the purpose of Misc/NEWS. Some changes I consider too small |
| 21 | or esoteric to include. If such a change is added to the text, |
| 22 | I'll just remove it. (This is another reason you shouldn't spend |
| 23 | too much time on writing your addition.) |
| 24 | |
| 25 | * If you want to draw your new text to the attention of the |
| 26 | maintainer, add 'XXX' to the beginning of the paragraph or |
| 27 | section. |
| 28 | |
| 29 | * It's OK to just add a fragmentary note about a change. For |
| 30 | example: "XXX Describe the transmogrify() function added to the |
| 31 | socket module." The maintainer will research the change and |
| 32 | write the necessary text. |
| 33 | |
| 34 | * You can comment out your additions if you like, but it's not |
| 35 | necessary (especially when a final release is some months away). |
| 36 | |
| 37 | * Credit the author of a patch or bugfix. Just the name is |
| 38 | sufficient; the e-mail address isn't necessary. |
| 39 | |
| 40 | * It's helpful to add the bug/patch number as a comment: |
| 41 | |
Giampaolo Rodolà | 3108f98 | 2011-02-24 20:59:48 +0000 | [diff] [blame] | 42 | XXX Describe the transmogrify() function added to the socket |
| 43 | module. |
Éric Araujo | b07b97f | 2011-10-05 01:03:34 +0200 | [diff] [blame^] | 44 | (Contributed by P.Y. Developer in :issue:`12345`.) |
Giampaolo Rodolà | 3108f98 | 2011-02-24 20:59:48 +0000 | [diff] [blame] | 45 | |
Éric Araujo | b07b97f | 2011-10-05 01:03:34 +0200 | [diff] [blame^] | 46 | This saves the maintainer the effort of going through the Mercurial log |
Giampaolo Rodolà | 3108f98 | 2011-02-24 20:59:48 +0000 | [diff] [blame] | 47 | when researching a change. |
| 48 | |
| 49 | This article explains the new features in Python 3.3, compared to 3.2. |
| 50 | |
| 51 | |
| 52 | PEP XXX: Stub |
| 53 | ============= |
| 54 | |
| 55 | |
Ezio Melotti | 48a2f8f | 2011-09-29 00:18:19 +0300 | [diff] [blame] | 56 | PEP 393: Flexible String Representation |
| 57 | ======================================= |
| 58 | |
Ezio Melotti | 397546a | 2011-09-29 08:34:36 +0300 | [diff] [blame] | 59 | XXX Give a short introduction about :pep:`393`. |
| 60 | |
| 61 | PEP 393 is fully backward compatible. The legacy API should remain |
| 62 | available at least five years. Applications using the legacy API will not |
| 63 | fully benefit of the memory reduction, or worse may use a little bit more |
| 64 | memory, because Python may have to maintain two versions of each string (in |
| 65 | the legacy format and in the new efficient storage). |
| 66 | |
Ezio Melotti | 48a2f8f | 2011-09-29 00:18:19 +0300 | [diff] [blame] | 67 | XXX Add list of changes introduced by :pep:`393` here: |
| 68 | |
Ezio Melotti | 397546a | 2011-09-29 08:34:36 +0300 | [diff] [blame] | 69 | * Python now always supports the full range of Unicode codepoints, including |
| 70 | non-BMP ones (i.e. from ``U+0000`` to ``U+10FFFF``). The distinction between |
| 71 | narrow and wide builds no longer exists and Python now behaves like a wide |
| 72 | build. |
| 73 | |
| 74 | * The storage of Unicode strings now depends on the highest codepoint in the string: |
| 75 | |
| 76 | * pure ASCII and Latin1 strings (``U+0000-U+00FF``) use 1 byte per codepoint; |
| 77 | |
| 78 | * BMP strings (``U+0000-U+FFFF``) use 2 bytes per codepoint; |
| 79 | |
| 80 | * non-BMP strings (``U+10000-U+10FFFF``) use 4 bytes per codepoint. |
| 81 | |
| 82 | .. The memory usage of Python 3.3 is two to three times smaller than Python 3.2, |
| 83 | and a little bit better than Python 2.7, on a `Django benchmark |
| 84 | <http://mail.python.org/pipermail/python-dev/2011-September/113714.html>`_. |
| 85 | XXX The result should be moved in the PEP and a small summary about |
| 86 | performances and a link to the PEP should be added here. |
| 87 | |
| 88 | * Some of the problems visible on narrow builds have been fixed, for example: |
| 89 | |
| 90 | * :func:`len` now always returns 1 for non-BMP characters, |
| 91 | so ``len('\U0010FFFF') == 1``; |
| 92 | |
| 93 | * surrogate pairs are not recombined in string literals, |
| 94 | so ``'\uDBFF\uDFFF' != '\U0010FFFF'``; |
| 95 | |
| 96 | * indexing or slicing a non-BMP characters doesn't return surrogates anymore, |
| 97 | so ``'\U0010FFFF'[0]`` now returns ``'\U0010FFFF'`` and not ``'\uDBFF'``; |
| 98 | |
| 99 | * several other functions in the stdlib now handle correctly non-BMP codepoints. |
| 100 | |
Ezio Melotti | 48a2f8f | 2011-09-29 00:18:19 +0300 | [diff] [blame] | 101 | * The value of :data:`sys.maxunicode` is now always ``1114111`` (``0x10FFFF`` |
| 102 | in hexadecimal). The :c:func:`PyUnicode_GetMax` function still returns |
| 103 | either ``0xFFFF`` or ``0x10FFFF`` for backward compatibility, and it should |
| 104 | not be used with the new Unicode API (see :issue:`13054`). |
| 105 | |
Ezio Melotti | 397546a | 2011-09-29 08:34:36 +0300 | [diff] [blame] | 106 | * The :file:`./configure` flag ``--with-wide-unicode`` has been removed. |
Victor Stinner | 7d637ab | 2011-09-29 02:56:16 +0200 | [diff] [blame] | 107 | |
Ezio Melotti | 397546a | 2011-09-29 08:34:36 +0300 | [diff] [blame] | 108 | XXX mention new and deprecated functions and macros |
Ezio Melotti | 48a2f8f | 2011-09-29 00:18:19 +0300 | [diff] [blame] | 109 | |
Éric Araujo | b07b97f | 2011-10-05 01:03:34 +0200 | [diff] [blame^] | 110 | |
Giampaolo Rodolà | 3108f98 | 2011-02-24 20:59:48 +0000 | [diff] [blame] | 111 | Other Language Changes |
| 112 | ====================== |
| 113 | |
| 114 | Some smaller changes made to the core Python language are: |
| 115 | |
| 116 | * Stub |
| 117 | |
| 118 | |
| 119 | New, Improved, and Deprecated Modules |
| 120 | ===================================== |
| 121 | |
| 122 | * Stub |
| 123 | |
Meador Inge | c5dbb3d | 2011-09-20 21:48:16 -0500 | [diff] [blame] | 124 | array |
| 125 | ----- |
| 126 | |
| 127 | The :mod:`array` module supports the :c:type:`long long` type using ``q`` and |
| 128 | ``Q`` type codes. |
| 129 | |
| 130 | (Contributed by Oren Tirosh and Hirokazu Yamamoto in :issue:`1172711`) |
| 131 | |
| 132 | |
Victor Stinner | 2cded9c | 2011-07-08 01:45:13 +0200 | [diff] [blame] | 133 | codecs |
| 134 | ------ |
| 135 | |
| 136 | Multibyte CJK decoders now resynchronize faster. They only ignore the first |
Georg Brandl | 6c0929b | 2011-07-09 11:43:33 +0200 | [diff] [blame] | 137 | byte of an invalid byte sequence. For example, ``b'\xff\n'.decode('gb2312', |
| 138 | 'replace')`` now returns a ``\n`` after the replacement character. |
Victor Stinner | 2cded9c | 2011-07-08 01:45:13 +0200 | [diff] [blame] | 139 | |
Georg Brandl | 6c0929b | 2011-07-09 11:43:33 +0200 | [diff] [blame] | 140 | (:issue:`12016`) |
Victor Stinner | 2cded9c | 2011-07-08 01:45:13 +0200 | [diff] [blame] | 141 | |
| 142 | Don't reset incremental encoders of CJK codecs at each call to their encode() |
Georg Brandl | 6c0929b | 2011-07-09 11:43:33 +0200 | [diff] [blame] | 143 | method anymore. For example:: |
Victor Stinner | 2cded9c | 2011-07-08 01:45:13 +0200 | [diff] [blame] | 144 | |
| 145 | $ ./python -q |
| 146 | >>> import codecs |
| 147 | >>> encoder = codecs.getincrementalencoder('hz')('strict') |
| 148 | >>> b''.join(encoder.encode(x) for x in '\u52ff\u65bd\u65bc\u4eba\u3002 Bye.') |
| 149 | b'~{NpJ)l6HK!#~} Bye.' |
| 150 | |
Georg Brandl | 6c0929b | 2011-07-09 11:43:33 +0200 | [diff] [blame] | 151 | This example gives ``b'~{Np~}~{J)~}~{l6~}~{HK~}~{!#~} Bye.'`` with older Python |
Victor Stinner | 2cded9c | 2011-07-08 01:45:13 +0200 | [diff] [blame] | 152 | versions. |
| 153 | |
Georg Brandl | 6c0929b | 2011-07-09 11:43:33 +0200 | [diff] [blame] | 154 | (:issue:`12100`) |
Victor Stinner | 2cded9c | 2011-07-08 01:45:13 +0200 | [diff] [blame] | 155 | |
Éric Araujo | 84b8ed8 | 2011-08-29 21:42:47 +0200 | [diff] [blame] | 156 | crypt |
| 157 | ----- |
| 158 | |
Victor Stinner | c78fb33 | 2011-09-21 03:35:44 +0200 | [diff] [blame] | 159 | Addition of salt and modular crypt format and the :func:`~crypt.mksalt` |
| 160 | function to the :mod:`crypt` module. |
Éric Araujo | 84b8ed8 | 2011-08-29 21:42:47 +0200 | [diff] [blame] | 161 | |
| 162 | (:issue:`10924`) |
| 163 | |
Victor Stinner | a7878b7 | 2011-07-14 23:07:44 +0200 | [diff] [blame] | 164 | curses |
| 165 | ------ |
| 166 | |
Victor Stinner | c78fb33 | 2011-09-21 03:35:44 +0200 | [diff] [blame] | 167 | * The :class:`curses.window` class has a new :meth:`~curses.window.get_wch` |
| 168 | method to get a wide character |
| 169 | * The :mod:`curses` module has a new :meth:`~curses.unget_wch` function to |
| 170 | push a wide character so the next :meth:`~curses.window.get_wch` will return |
| 171 | it |
Victor Stinner | a7878b7 | 2011-07-14 23:07:44 +0200 | [diff] [blame] | 172 | |
Victor Stinner | c78fb33 | 2011-09-21 03:35:44 +0200 | [diff] [blame] | 173 | (Contributed by Iñigo Serna in :issue:`6755`) |
Victor Stinner | a7878b7 | 2011-07-14 23:07:44 +0200 | [diff] [blame] | 174 | |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 175 | faulthandler |
| 176 | ------------ |
| 177 | |
| 178 | New module: :mod:`faulthandler`. |
| 179 | |
| 180 | * :envvar:`PYTHONFAULTHANDLER` |
| 181 | * :option:`-X` ``faulthandler`` |
| 182 | |
Victor Stinner | fa0e3d5 | 2011-05-09 01:01:09 +0200 | [diff] [blame] | 183 | |
Victor Stinner | 811db3b | 2011-09-21 03:20:03 +0200 | [diff] [blame] | 184 | ftplib |
| 185 | ------ |
| 186 | |
| 187 | The :class:`~ftplib.FTP_TLS` class now provides a new |
| 188 | :func:`~ftplib.FTP_TLS.ccc` function to revert control channel back to |
| 189 | plaintex. This can be useful to take advantage of firewalls that know how to |
| 190 | handle NAT with non-secure FTP without opening fixed ports. |
| 191 | |
| 192 | (Contributed by Giampaolo Rodolà in :issue:`12139`) |
| 193 | |
| 194 | |
Victor Stinner | fa0e3d5 | 2011-05-09 01:01:09 +0200 | [diff] [blame] | 195 | math |
| 196 | ---- |
| 197 | |
| 198 | The :mod:`math` module has a new function: |
| 199 | |
| 200 | * :func:`~math.log2`: return the base-2 logarithm of *x* |
| 201 | (Written by Mark Dickinson in :issue:`11888`). |
| 202 | |
| 203 | |
| 204 | nntplib |
| 205 | ------- |
| 206 | |
| 207 | The :class:`nntplib.NNTP` class now supports the context manager protocol to |
| 208 | unconditionally consume :exc:`socket.error` exceptions and to close the NNTP |
| 209 | connection when done:: |
| 210 | |
| 211 | >>> from nntplib import NNTP |
Ezio Melotti | 3c14b4e | 2011-07-13 11:44:44 +0300 | [diff] [blame] | 212 | >>> with NNTP('news.gmane.org') as n: |
Victor Stinner | fa0e3d5 | 2011-05-09 01:01:09 +0200 | [diff] [blame] | 213 | ... n.group('gmane.comp.python.committers') |
| 214 | ... |
Ezio Melotti | 04f648c | 2011-07-26 09:37:46 +0300 | [diff] [blame] | 215 | ('211 1755 1 1755 gmane.comp.python.committers', 1755, 1, 1755, 'gmane.comp.python.committers') |
Victor Stinner | fa0e3d5 | 2011-05-09 01:01:09 +0200 | [diff] [blame] | 216 | >>> |
| 217 | |
| 218 | (Contributed by Giampaolo Rodolà in :issue:`9795`) |
| 219 | |
| 220 | |
Giampaolo Rodolà | c9c2c8b | 2011-02-25 14:39:16 +0000 | [diff] [blame] | 221 | os |
| 222 | -- |
| 223 | |
Charles-François Natali | a003af1 | 2011-06-01 20:30:52 +0200 | [diff] [blame] | 224 | * The :mod:`os` module has a new :func:`~os.pipe2` function that makes it |
| 225 | possible to create a pipe with :data:`~os.O_CLOEXEC` or |
| 226 | :data:`~os.O_NONBLOCK` flags set atomically. This is especially useful to |
| 227 | avoid race conditions in multi-threaded programs. |
| 228 | |
Giampaolo Rodolà | 18e8bcb | 2011-02-25 20:57:54 +0000 | [diff] [blame] | 229 | * The :mod:`os` module has a new :func:`~os.sendfile` function which provides |
| 230 | an efficent "zero-copy" way for copying data from one file (or socket) |
| 231 | descriptor to another. The phrase "zero-copy" refers to the fact that all of |
| 232 | the copying of data between the two descriptors is done entirely by the |
| 233 | kernel, with no copying of data into userspace buffers. :func:`~os.sendfile` |
| 234 | can be used to efficiently copy data from a file on disk to a network socket, |
| 235 | e.g. for downloading a file. |
Giampaolo Rodolà | c9c2c8b | 2011-02-25 14:39:16 +0000 | [diff] [blame] | 236 | |
Giampaolo Rodolà | 18e8bcb | 2011-02-25 20:57:54 +0000 | [diff] [blame] | 237 | (Patch submitted by Ross Lagerwall and Giampaolo Rodolà in :issue:`10882`.) |
| 238 | |
| 239 | * The :mod:`os` module has two new functions: :func:`~os.getpriority` and |
| 240 | :func:`~os.setpriority`. They can be used to get or set process |
| 241 | niceness/priority in a fashion similar to :func:`os.nice` but extended to all |
| 242 | processes instead of just the current one. |
| 243 | |
| 244 | (Patch submitted by Giampaolo Rodolà in :issue:`10784`.) |
Giampaolo Rodolà | 3108f98 | 2011-02-24 20:59:48 +0000 | [diff] [blame] | 245 | |
Giampaolo Rodolà | 424298a | 2011-03-03 18:34:06 +0000 | [diff] [blame] | 246 | |
Éric Araujo | 765e94f | 2011-06-03 17:26:59 +0200 | [diff] [blame] | 247 | packaging |
| 248 | --------- |
| 249 | |
| 250 | :mod:`distutils` has undergone additions and refactoring under a new name, |
| 251 | :mod:`packaging`, to allow developers to break backward compatibility. |
| 252 | :mod:`distutils` is still provided in the standard library, but users are |
| 253 | encouraged to transition to :mod:`packaging`. For older versions of Python, a |
| 254 | backport compatible with 2.4+ and 3.1+ will be made available on PyPI under the |
| 255 | name :mod:`distutils2`. |
| 256 | |
| 257 | .. TODO add examples and howto to the packaging docs and link to them |
| 258 | |
| 259 | |
Victor Stinner | 383c3fc | 2011-05-25 01:35:05 +0200 | [diff] [blame] | 260 | pydoc |
| 261 | ----- |
| 262 | |
Victor Stinner | 6daa33c | 2011-05-25 01:41:22 +0200 | [diff] [blame] | 263 | The Tk GUI and the :func:`~pydoc.serve` function have been removed from the |
| 264 | :mod:`pydoc` module: ``pydoc -g`` and :func:`~pydoc.serve` have been deprecated |
| 265 | in Python 3.2. |
Victor Stinner | 383c3fc | 2011-05-25 01:35:05 +0200 | [diff] [blame] | 266 | |
| 267 | |
Victor Stinner | d5c355c | 2011-04-30 14:53:09 +0200 | [diff] [blame] | 268 | sys |
| 269 | --- |
Victor Stinner | 754851f | 2011-04-19 23:58:51 +0200 | [diff] [blame] | 270 | |
Éric Araujo | 84b8ed8 | 2011-08-29 21:42:47 +0200 | [diff] [blame] | 271 | * The :mod:`sys` module has a new :data:`~sys.thread_info` :term:`struct |
Victor Stinner | d5c355c | 2011-04-30 14:53:09 +0200 | [diff] [blame] | 272 | sequence` holding informations about the thread implementation. |
Victor Stinner | 754851f | 2011-04-19 23:58:51 +0200 | [diff] [blame] | 273 | |
Georg Brandl | 00db582 | 2011-04-30 15:30:03 +0200 | [diff] [blame] | 274 | (:issue:`11223`) |
Victor Stinner | a929335 | 2011-04-30 15:21:58 +0200 | [diff] [blame] | 275 | |
Victor Stinner | fa0e3d5 | 2011-05-09 01:01:09 +0200 | [diff] [blame] | 276 | |
Victor Stinner | a929335 | 2011-04-30 15:21:58 +0200 | [diff] [blame] | 277 | signal |
| 278 | ------ |
| 279 | |
Victor Stinner | fa0e3d5 | 2011-05-09 01:01:09 +0200 | [diff] [blame] | 280 | * The :mod:`signal` module has new functions: |
Victor Stinner | a929335 | 2011-04-30 15:21:58 +0200 | [diff] [blame] | 281 | |
Victor Stinner | b3e7219 | 2011-05-08 01:46:11 +0200 | [diff] [blame] | 282 | * :func:`~signal.pthread_sigmask`: fetch and/or change the signal mask of the |
| 283 | calling thread (Contributed by Jean-Paul Calderone in :issue:`8407`) ; |
| 284 | * :func:`~signal.pthread_kill`: send a signal to a thread ; |
| 285 | * :func:`~signal.sigpending`: examine pending functions ; |
| 286 | * :func:`~signal.sigwait`: wait a signal. |
Ross Lagerwall | bc80822 | 2011-06-25 12:13:40 +0200 | [diff] [blame] | 287 | * :func:`~signal.sigwaitinfo`: wait for a signal, returning detailed |
| 288 | information about it. |
| 289 | * :func:`~signal.sigtimedwait`: like :func:`~signal.sigwaitinfo` but with a |
| 290 | timeout. |
Victor Stinner | a929335 | 2011-04-30 15:21:58 +0200 | [diff] [blame] | 291 | |
Victor Stinner | d49b1f1 | 2011-05-08 02:03:15 +0200 | [diff] [blame] | 292 | * The signal handler writes the signal number as a single byte instead of |
| 293 | a nul byte into the wakeup file descriptor. So it is possible to wait more |
| 294 | than one signal and know which signals were raised. |
| 295 | |
Victor Stinner | 388196e | 2011-05-10 17:13:00 +0200 | [diff] [blame] | 296 | * :func:`signal.signal` and :func:`signal.siginterrupt` raise an OSError, |
| 297 | instead of a RuntimeError: OSError has an errno attribute. |
| 298 | |
Nick Coghlan | 96fe56a | 2011-08-22 11:55:57 +1000 | [diff] [blame] | 299 | socket |
| 300 | ------ |
| 301 | |
| 302 | The :class:`~socket.socket` class now exposes addititonal methods to |
| 303 | process ancillary data when supported by the underlying platform: |
| 304 | |
| 305 | * :func:`~socket.socket.sendmsg` |
| 306 | * :func:`~socket.socket.recvmsg` |
| 307 | * :func:`~socket.socket.recvmsg_into` |
| 308 | |
| 309 | (Contributed by David Watson in :issue:`6560`, based on an earlier patch |
| 310 | by Heiko Wundram) |
Victor Stinner | 754851f | 2011-04-19 23:58:51 +0200 | [diff] [blame] | 311 | |
Victor Stinner | 99c8b16 | 2011-05-24 12:05:19 +0200 | [diff] [blame] | 312 | ssl |
| 313 | --- |
| 314 | |
| 315 | The :mod:`ssl` module has new functions: |
| 316 | |
| 317 | * :func:`~ssl.RAND_bytes`: generate cryptographically strong |
| 318 | pseudo-random bytes. |
| 319 | * :func:`~ssl.RAND_pseudo_bytes`: generate pseudo-random bytes. |
| 320 | |
| 321 | |
Giampaolo Rodola' | 210e7ca | 2011-07-01 13:55:36 +0200 | [diff] [blame] | 322 | shutil |
| 323 | ------ |
| 324 | |
Sandro Tosi | aec2f21 | 2011-08-23 00:58:21 +0200 | [diff] [blame] | 325 | * The :mod:`shutil` module has these new fuctions: |
Giampaolo Rodola' | 210e7ca | 2011-07-01 13:55:36 +0200 | [diff] [blame] | 326 | |
Sandro Tosi | aec2f21 | 2011-08-23 00:58:21 +0200 | [diff] [blame] | 327 | * :func:`~shutil.disk_usage`: provides total, used and free disk space |
| 328 | statistics. (Contributed by Giampaolo Rodolà in :issue:`12442`) |
| 329 | * :func:`~shutil.chown`: allows one to change user and/or group of the given |
| 330 | path also specifying the user/group names and not only their numeric |
| 331 | ids. (Contributed by Sandro Tosi in :issue:`12191`) |
Giampaolo Rodola' | 096dcb1 | 2011-06-27 11:17:51 +0200 | [diff] [blame] | 332 | |
| 333 | |
Giampaolo Rodolà | 3108f98 | 2011-02-24 20:59:48 +0000 | [diff] [blame] | 334 | Optimizations |
| 335 | ============= |
| 336 | |
| 337 | Major performance enhancements have been added: |
| 338 | |
| 339 | * Stub |
| 340 | |
| 341 | |
| 342 | Build and C API Changes |
| 343 | ======================= |
| 344 | |
| 345 | Changes to Python's build process and to the C API include: |
| 346 | |
| 347 | * Stub |
| 348 | |
| 349 | |
Georg Brandl | 0cd25c9 | 2011-04-29 13:45:54 +0200 | [diff] [blame] | 350 | Unsupported Operating Systems |
Victor Stinner | b90db4c | 2011-04-26 22:48:24 +0200 | [diff] [blame] | 351 | ============================= |
| 352 | |
Brian Curtin | 49a40cd | 2011-05-02 22:30:06 -0500 | [diff] [blame] | 353 | OS/2 and VMS are no longer supported due to the lack of a maintainer. |
| 354 | |
| 355 | Windows 2000 and Windows platforms which set ``COMSPEC`` to ``command.com`` |
| 356 | are no longer supported due to maintenance burden. |
Victor Stinner | b90db4c | 2011-04-26 22:48:24 +0200 | [diff] [blame] | 357 | |
| 358 | |
Giampaolo Rodolà | 3108f98 | 2011-02-24 20:59:48 +0000 | [diff] [blame] | 359 | Porting to Python 3.3 |
| 360 | ===================== |
| 361 | |
| 362 | This section lists previously described changes and other bugfixes |
| 363 | that may require changes to your code: |
| 364 | |
Victor Stinner | ff3d939 | 2011-08-20 23:39:26 +0200 | [diff] [blame] | 365 | * Issue #12326: On Linux, sys.platform doesn't contain the major version |
| 366 | anymore. It is now always 'linux', instead of 'linux2' or 'linux3' depending |
| 367 | on the Linux version used to build Python. Replace sys.platform == 'linux2' |
| 368 | with sys.platform.startswith('linux'), or directly sys.platform == 'linux' if |
| 369 | you don't need to support older Python versions. |
Éric Araujo | c09fca6 | 2011-03-23 02:06:24 +0100 | [diff] [blame] | 370 | |
| 371 | .. Issue #11591: When :program:`python` was started with :option:`-S`, |
| 372 | ``import site`` will not add site-specific paths to the module search |
| 373 | paths. In previous versions, it did. See changeset for doc changes in |
| 374 | various files. Contributed by Carl Meyer with editions by Éric Araujo. |
Éric Araujo | be3bd57 | 2011-03-26 01:55:15 +0100 | [diff] [blame] | 375 | |
| 376 | .. Issue #10998: -Q command-line flags are related artifacts have been |
| 377 | removed. Code checking sys.flags.division_warning will need updating. |
| 378 | Contributed by Éric Araujo. |
Victor Stinner | 7d637ab | 2011-09-29 02:56:16 +0200 | [diff] [blame] | 379 | |
| 380 | * :pep:`393`: The :c:type:`Py_UNICODE` type and all functions using this type |
| 381 | are deprecated. To fully benefit of the memory footprint reduction provided |
| 382 | by the PEP 393, you have to convert your code to the new Unicode API. Read |
| 383 | the porting guide: XXX. |
| 384 | |