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 | |
Ezio Melotti | 48a2f8f | 2011-09-29 00:18:19 +0300 | [diff] [blame] | 52 | PEP 393: Flexible String Representation |
| 53 | ======================================= |
| 54 | |
Éric Araujo | 5043f09 | 2011-10-05 01:04:18 +0200 | [diff] [blame] | 55 | [Abstract copied from the PEP: The Unicode string type is changed to support |
| 56 | multiple internal representations, depending on the character with the largest |
| 57 | Unicode ordinal (1, 2, or 4 bytes). This allows a space-efficient |
| 58 | representation in common cases, but gives access to full UCS-4 on all systems. |
| 59 | For compatibility with existing APIs, several representations may exist in |
| 60 | parallel; over time, this compatibility should be phased out.] |
Ezio Melotti | 397546a | 2011-09-29 08:34:36 +0300 | [diff] [blame] | 61 | |
| 62 | PEP 393 is fully backward compatible. The legacy API should remain |
| 63 | available at least five years. Applications using the legacy API will not |
| 64 | fully benefit of the memory reduction, or worse may use a little bit more |
| 65 | memory, because Python may have to maintain two versions of each string (in |
| 66 | the legacy format and in the new efficient storage). |
| 67 | |
Ezio Melotti | 48a2f8f | 2011-09-29 00:18:19 +0300 | [diff] [blame] | 68 | XXX Add list of changes introduced by :pep:`393` here: |
| 69 | |
Ezio Melotti | 397546a | 2011-09-29 08:34:36 +0300 | [diff] [blame] | 70 | * Python now always supports the full range of Unicode codepoints, including |
| 71 | non-BMP ones (i.e. from ``U+0000`` to ``U+10FFFF``). The distinction between |
| 72 | narrow and wide builds no longer exists and Python now behaves like a wide |
| 73 | build. |
| 74 | |
| 75 | * The storage of Unicode strings now depends on the highest codepoint in the string: |
| 76 | |
| 77 | * pure ASCII and Latin1 strings (``U+0000-U+00FF``) use 1 byte per codepoint; |
| 78 | |
| 79 | * BMP strings (``U+0000-U+FFFF``) use 2 bytes per codepoint; |
| 80 | |
| 81 | * non-BMP strings (``U+10000-U+10FFFF``) use 4 bytes per codepoint. |
| 82 | |
| 83 | .. The memory usage of Python 3.3 is two to three times smaller than Python 3.2, |
| 84 | and a little bit better than Python 2.7, on a `Django benchmark |
| 85 | <http://mail.python.org/pipermail/python-dev/2011-September/113714.html>`_. |
| 86 | XXX The result should be moved in the PEP and a small summary about |
| 87 | performances and a link to the PEP should be added here. |
| 88 | |
| 89 | * Some of the problems visible on narrow builds have been fixed, for example: |
| 90 | |
| 91 | * :func:`len` now always returns 1 for non-BMP characters, |
| 92 | so ``len('\U0010FFFF') == 1``; |
| 93 | |
| 94 | * surrogate pairs are not recombined in string literals, |
| 95 | so ``'\uDBFF\uDFFF' != '\U0010FFFF'``; |
| 96 | |
| 97 | * indexing or slicing a non-BMP characters doesn't return surrogates anymore, |
| 98 | so ``'\U0010FFFF'[0]`` now returns ``'\U0010FFFF'`` and not ``'\uDBFF'``; |
| 99 | |
| 100 | * several other functions in the stdlib now handle correctly non-BMP codepoints. |
| 101 | |
Ezio Melotti | 48a2f8f | 2011-09-29 00:18:19 +0300 | [diff] [blame] | 102 | * The value of :data:`sys.maxunicode` is now always ``1114111`` (``0x10FFFF`` |
| 103 | in hexadecimal). The :c:func:`PyUnicode_GetMax` function still returns |
| 104 | either ``0xFFFF`` or ``0x10FFFF`` for backward compatibility, and it should |
| 105 | not be used with the new Unicode API (see :issue:`13054`). |
| 106 | |
Ezio Melotti | 397546a | 2011-09-29 08:34:36 +0300 | [diff] [blame] | 107 | * The :file:`./configure` flag ``--with-wide-unicode`` has been removed. |
Victor Stinner | 7d637ab | 2011-09-29 02:56:16 +0200 | [diff] [blame] | 108 | |
Ezio Melotti | 397546a | 2011-09-29 08:34:36 +0300 | [diff] [blame] | 109 | XXX mention new and deprecated functions and macros |
Ezio Melotti | 48a2f8f | 2011-09-29 00:18:19 +0300 | [diff] [blame] | 110 | |
Éric Araujo | b07b97f | 2011-10-05 01:03:34 +0200 | [diff] [blame] | 111 | |
Victor Stinner | a1bf298 | 2011-10-12 20:35:02 +0200 | [diff] [blame] | 112 | PEP 3151: Reworking the OS and IO exception hierarchy |
| 113 | ===================================================== |
| 114 | |
| 115 | :pep:`3151` - Reworking the OS and IO exception hierarchy |
| 116 | PEP written and implemented by Antoine Pitrou. |
| 117 | |
| 118 | New subclasses of :exc:`OSError` exceptions: |
| 119 | |
| 120 | * :exc:`BlockingIOError` |
| 121 | * :exc:`ChildProcessError` |
| 122 | * :exc:`ConnectionError` |
| 123 | |
| 124 | * :exc:`BrokenPipeError` |
| 125 | * :exc:`ConnectionAbortedError` |
| 126 | * :exc:`ConnectionRefusedError` |
| 127 | * :exc:`ConnectionResetError` |
| 128 | |
| 129 | * :exc:`FileExistsError` |
| 130 | * :exc:`FileNotFoundError` |
| 131 | * :exc:`InterruptedError` |
| 132 | * :exc:`IsADirectoryError` |
| 133 | * :exc:`NotADirectoryError` |
| 134 | * :exc:`PermissionError` |
| 135 | * :exc:`ProcessLookupError` |
| 136 | * :exc:`TimeoutError` |
| 137 | |
| 138 | The following exceptions have been merged into :exc:`OSError`: |
| 139 | |
| 140 | * :exc:`EnvironmentError` |
| 141 | * :exc:`IOError` |
| 142 | * :exc:`WindowsError` |
| 143 | * :exc:`VMSError` |
| 144 | * :exc:`socket.error` |
| 145 | * :exc:`select.error` |
| 146 | * :exc:`mmap.error` |
| 147 | |
| 148 | Thanks to the new exceptions, common usages of the :mod:`errno` can now be |
| 149 | avoided. For example, the following code written for Python 3.2: :: |
| 150 | |
| 151 | from errno import ENOENT, EACCES, EPERM |
| 152 | |
| 153 | try: |
| 154 | with open("document.txt") as f: |
| 155 | content = f.read() |
| 156 | except IOError as err: |
| 157 | if err.errno == ENOENT: |
| 158 | print("document.txt file is missing") |
| 159 | elif err.errno in (EACCES, EPERM): |
| 160 | print("You are not allowed to read document.txt") |
| 161 | else: |
| 162 | raise |
| 163 | |
| 164 | can now be written without the :mod:`errno` import: :: |
| 165 | |
| 166 | try: |
| 167 | with open("document.txt") as f: |
| 168 | content = f.read() |
| 169 | except FileNotFoundError: |
| 170 | print("document.txt file is missing") |
| 171 | except PermissionError: |
| 172 | print("You are not allowed to read document.txt") |
| 173 | |
| 174 | |
Giampaolo Rodolà | 3108f98 | 2011-02-24 20:59:48 +0000 | [diff] [blame] | 175 | Other Language Changes |
| 176 | ====================== |
| 177 | |
| 178 | Some smaller changes made to the core Python language are: |
| 179 | |
| 180 | * Stub |
| 181 | |
Ezio Melotti | 931b8aa | 2011-10-21 21:57:36 +0300 | [diff] [blame] | 182 | Added support for Unicode name aliases and named sequences. |
| 183 | Both :func:`unicodedata.lookup()` and '\N{...}' now resolve name aliases, |
| 184 | and :func:`unicodedata.lookup()` resolves named sequences too. |
| 185 | |
| 186 | (Contributed by Ezio Melotti in :issue:`12753`) |
| 187 | |
Giampaolo Rodolà | 3108f98 | 2011-02-24 20:59:48 +0000 | [diff] [blame] | 188 | |
Mark Dickinson | 3664568 | 2011-10-23 19:53:01 +0100 | [diff] [blame^] | 189 | Equality comparisons on :func:`range` objects now return a result reflecting |
| 190 | the equality of the underlying sequences generated by those range objects. |
| 191 | |
| 192 | (:issue:`13021`) |
| 193 | |
| 194 | |
Giampaolo Rodolà | 3108f98 | 2011-02-24 20:59:48 +0000 | [diff] [blame] | 195 | New, Improved, and Deprecated Modules |
| 196 | ===================================== |
| 197 | |
| 198 | * Stub |
| 199 | |
Meador Inge | c5dbb3d | 2011-09-20 21:48:16 -0500 | [diff] [blame] | 200 | array |
| 201 | ----- |
| 202 | |
| 203 | The :mod:`array` module supports the :c:type:`long long` type using ``q`` and |
| 204 | ``Q`` type codes. |
| 205 | |
| 206 | (Contributed by Oren Tirosh and Hirokazu Yamamoto in :issue:`1172711`) |
| 207 | |
| 208 | |
Victor Stinner | 2cded9c | 2011-07-08 01:45:13 +0200 | [diff] [blame] | 209 | codecs |
| 210 | ------ |
| 211 | |
Victor Stinner | 3a50e70 | 2011-10-18 21:21:00 +0200 | [diff] [blame] | 212 | The :mod:`~encodings.mbcs` codec has be rewritten to handle correclty |
| 213 | ``replace`` and ``ignore`` error handlers on all Windows versions. The |
| 214 | :mod:`~encodings.mbcs` codec is now supporting all error handlers, instead of |
| 215 | only ``replace`` to encode and ``ignore`` to decode. |
| 216 | |
Victor Stinner | 2cded9c | 2011-07-08 01:45:13 +0200 | [diff] [blame] | 217 | Multibyte CJK decoders now resynchronize faster. They only ignore the first |
Georg Brandl | 6c0929b | 2011-07-09 11:43:33 +0200 | [diff] [blame] | 218 | byte of an invalid byte sequence. For example, ``b'\xff\n'.decode('gb2312', |
| 219 | 'replace')`` now returns a ``\n`` after the replacement character. |
Victor Stinner | 2cded9c | 2011-07-08 01:45:13 +0200 | [diff] [blame] | 220 | |
Georg Brandl | 6c0929b | 2011-07-09 11:43:33 +0200 | [diff] [blame] | 221 | (:issue:`12016`) |
Victor Stinner | 2cded9c | 2011-07-08 01:45:13 +0200 | [diff] [blame] | 222 | |
| 223 | 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] | 224 | method anymore. For example:: |
Victor Stinner | 2cded9c | 2011-07-08 01:45:13 +0200 | [diff] [blame] | 225 | |
| 226 | $ ./python -q |
| 227 | >>> import codecs |
| 228 | >>> encoder = codecs.getincrementalencoder('hz')('strict') |
| 229 | >>> b''.join(encoder.encode(x) for x in '\u52ff\u65bd\u65bc\u4eba\u3002 Bye.') |
| 230 | b'~{NpJ)l6HK!#~} Bye.' |
| 231 | |
Georg Brandl | 6c0929b | 2011-07-09 11:43:33 +0200 | [diff] [blame] | 232 | This example gives ``b'~{Np~}~{J)~}~{l6~}~{HK~}~{!#~} Bye.'`` with older Python |
Victor Stinner | 2cded9c | 2011-07-08 01:45:13 +0200 | [diff] [blame] | 233 | versions. |
| 234 | |
Georg Brandl | 6c0929b | 2011-07-09 11:43:33 +0200 | [diff] [blame] | 235 | (:issue:`12100`) |
Victor Stinner | 2cded9c | 2011-07-08 01:45:13 +0200 | [diff] [blame] | 236 | |
Éric Araujo | 84b8ed8 | 2011-08-29 21:42:47 +0200 | [diff] [blame] | 237 | crypt |
| 238 | ----- |
| 239 | |
Victor Stinner | c78fb33 | 2011-09-21 03:35:44 +0200 | [diff] [blame] | 240 | Addition of salt and modular crypt format and the :func:`~crypt.mksalt` |
| 241 | function to the :mod:`crypt` module. |
Éric Araujo | 84b8ed8 | 2011-08-29 21:42:47 +0200 | [diff] [blame] | 242 | |
| 243 | (:issue:`10924`) |
| 244 | |
Victor Stinner | a7878b7 | 2011-07-14 23:07:44 +0200 | [diff] [blame] | 245 | curses |
| 246 | ------ |
| 247 | |
Victor Stinner | c78fb33 | 2011-09-21 03:35:44 +0200 | [diff] [blame] | 248 | * The :class:`curses.window` class has a new :meth:`~curses.window.get_wch` |
| 249 | method to get a wide character |
| 250 | * The :mod:`curses` module has a new :meth:`~curses.unget_wch` function to |
| 251 | push a wide character so the next :meth:`~curses.window.get_wch` will return |
| 252 | it |
Victor Stinner | a7878b7 | 2011-07-14 23:07:44 +0200 | [diff] [blame] | 253 | |
Victor Stinner | c78fb33 | 2011-09-21 03:35:44 +0200 | [diff] [blame] | 254 | (Contributed by Iñigo Serna in :issue:`6755`) |
Victor Stinner | a7878b7 | 2011-07-14 23:07:44 +0200 | [diff] [blame] | 255 | |
Victor Stinner | 024e37a | 2011-03-31 01:31:06 +0200 | [diff] [blame] | 256 | faulthandler |
| 257 | ------------ |
| 258 | |
| 259 | New module: :mod:`faulthandler`. |
| 260 | |
| 261 | * :envvar:`PYTHONFAULTHANDLER` |
| 262 | * :option:`-X` ``faulthandler`` |
| 263 | |
Victor Stinner | fa0e3d5 | 2011-05-09 01:01:09 +0200 | [diff] [blame] | 264 | |
Victor Stinner | 811db3b | 2011-09-21 03:20:03 +0200 | [diff] [blame] | 265 | ftplib |
| 266 | ------ |
| 267 | |
| 268 | The :class:`~ftplib.FTP_TLS` class now provides a new |
| 269 | :func:`~ftplib.FTP_TLS.ccc` function to revert control channel back to |
| 270 | plaintex. This can be useful to take advantage of firewalls that know how to |
| 271 | handle NAT with non-secure FTP without opening fixed ports. |
| 272 | |
| 273 | (Contributed by Giampaolo Rodolà in :issue:`12139`) |
| 274 | |
| 275 | |
Victor Stinner | fa0e3d5 | 2011-05-09 01:01:09 +0200 | [diff] [blame] | 276 | math |
| 277 | ---- |
| 278 | |
| 279 | The :mod:`math` module has a new function: |
| 280 | |
| 281 | * :func:`~math.log2`: return the base-2 logarithm of *x* |
| 282 | (Written by Mark Dickinson in :issue:`11888`). |
| 283 | |
| 284 | |
| 285 | nntplib |
| 286 | ------- |
| 287 | |
| 288 | The :class:`nntplib.NNTP` class now supports the context manager protocol to |
| 289 | unconditionally consume :exc:`socket.error` exceptions and to close the NNTP |
| 290 | connection when done:: |
| 291 | |
| 292 | >>> from nntplib import NNTP |
Ezio Melotti | 3c14b4e | 2011-07-13 11:44:44 +0300 | [diff] [blame] | 293 | >>> with NNTP('news.gmane.org') as n: |
Victor Stinner | fa0e3d5 | 2011-05-09 01:01:09 +0200 | [diff] [blame] | 294 | ... n.group('gmane.comp.python.committers') |
| 295 | ... |
Ezio Melotti | 04f648c | 2011-07-26 09:37:46 +0300 | [diff] [blame] | 296 | ('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] | 297 | >>> |
| 298 | |
| 299 | (Contributed by Giampaolo Rodolà in :issue:`9795`) |
| 300 | |
| 301 | |
Giampaolo Rodolà | c9c2c8b | 2011-02-25 14:39:16 +0000 | [diff] [blame] | 302 | os |
| 303 | -- |
| 304 | |
Charles-François Natali | a003af1 | 2011-06-01 20:30:52 +0200 | [diff] [blame] | 305 | * The :mod:`os` module has a new :func:`~os.pipe2` function that makes it |
| 306 | possible to create a pipe with :data:`~os.O_CLOEXEC` or |
| 307 | :data:`~os.O_NONBLOCK` flags set atomically. This is especially useful to |
| 308 | avoid race conditions in multi-threaded programs. |
| 309 | |
Giampaolo Rodolà | 18e8bcb | 2011-02-25 20:57:54 +0000 | [diff] [blame] | 310 | * The :mod:`os` module has a new :func:`~os.sendfile` function which provides |
| 311 | an efficent "zero-copy" way for copying data from one file (or socket) |
| 312 | descriptor to another. The phrase "zero-copy" refers to the fact that all of |
| 313 | the copying of data between the two descriptors is done entirely by the |
| 314 | kernel, with no copying of data into userspace buffers. :func:`~os.sendfile` |
| 315 | can be used to efficiently copy data from a file on disk to a network socket, |
| 316 | e.g. for downloading a file. |
Giampaolo Rodolà | c9c2c8b | 2011-02-25 14:39:16 +0000 | [diff] [blame] | 317 | |
Giampaolo Rodolà | 18e8bcb | 2011-02-25 20:57:54 +0000 | [diff] [blame] | 318 | (Patch submitted by Ross Lagerwall and Giampaolo Rodolà in :issue:`10882`.) |
| 319 | |
| 320 | * The :mod:`os` module has two new functions: :func:`~os.getpriority` and |
| 321 | :func:`~os.setpriority`. They can be used to get or set process |
| 322 | niceness/priority in a fashion similar to :func:`os.nice` but extended to all |
| 323 | processes instead of just the current one. |
| 324 | |
| 325 | (Patch submitted by Giampaolo Rodolà in :issue:`10784`.) |
Giampaolo Rodolà | 3108f98 | 2011-02-24 20:59:48 +0000 | [diff] [blame] | 326 | |
Victor Stinner | e506437 | 2011-10-14 00:08:29 +0200 | [diff] [blame] | 327 | * "at" functions (:issue:`4761`): |
| 328 | |
| 329 | * :func:`~os.faccessat` |
| 330 | * :func:`~os.fchmodat` |
| 331 | * :func:`~os.fchownat` |
| 332 | * :func:`~os.fstatat` |
| 333 | * :func:`~os.futimesat` |
| 334 | * :func:`~os.futimesat` |
| 335 | * :func:`~os.linkat` |
| 336 | * :func:`~os.mkdirat` |
| 337 | * :func:`~os.mkfifoat` |
| 338 | * :func:`~os.mknodat` |
| 339 | * :func:`~os.openat` |
| 340 | * :func:`~os.readlinkat` |
| 341 | * :func:`~os.renameat` |
| 342 | * :func:`~os.symlinkat` |
| 343 | * :func:`~os.unlinkat` |
| 344 | * :func:`~os.utimensat` |
| 345 | * :func:`~os.utimensat` |
| 346 | |
| 347 | * extended attributes (:issue:`12720`): |
| 348 | |
| 349 | * :func:`~os.fgetxattr` |
| 350 | * :func:`~os.flistxattr` |
| 351 | * :func:`~os.fremovexattr` |
| 352 | * :func:`~os.fsetxattr` |
| 353 | * :func:`~os.getxattr` |
| 354 | * :func:`~os.lgetxattr` |
| 355 | * :func:`~os.listxattr` |
| 356 | * :func:`~os.llistxattr` |
| 357 | * :func:`~os.lremovexattr` |
| 358 | * :func:`~os.lsetxattr` |
| 359 | * :func:`~os.removexattr` |
| 360 | * :func:`~os.setxattr` |
| 361 | |
| 362 | * Scheduler functions (:issue:`12655`): |
| 363 | |
| 364 | * :func:`~os.sched_get_priority_max` |
| 365 | * :func:`~os.sched_get_priority_min` |
| 366 | * :func:`~os.sched_getaffinity` |
| 367 | * :func:`~os.sched_getparam` |
| 368 | * :func:`~os.sched_getscheduler` |
| 369 | * :func:`~os.sched_rr_get_interval` |
| 370 | * :func:`~os.sched_setaffinity` |
| 371 | * :func:`~os.sched_setparam` |
| 372 | * :func:`~os.sched_setscheduler` |
| 373 | * :func:`~os.sched_yield` |
| 374 | |
| 375 | * Add some extra posix functions to the os module (:issue:`10812`): |
| 376 | |
| 377 | * :func:`~os.fexecve` |
| 378 | * :func:`~os.futimens` |
| 379 | * :func:`~os.futimens` |
| 380 | * :func:`~os.futimes` |
| 381 | * :func:`~os.futimes` |
| 382 | * :func:`~os.lockf` |
| 383 | * :func:`~os.lutimes` |
| 384 | * :func:`~os.lutimes` |
| 385 | * :func:`~os.posix_fadvise` |
| 386 | * :func:`~os.posix_fallocate` |
| 387 | * :func:`~os.pread` |
| 388 | * :func:`~os.pwrite` |
| 389 | * :func:`~os.readv` |
| 390 | * :func:`~os.sync` |
| 391 | * :func:`~os.truncate` |
| 392 | * :func:`~os.waitid` |
| 393 | * :func:`~os.writev` |
| 394 | |
| 395 | * Other new functions: |
| 396 | |
| 397 | * :func:`~os.fdlistdir` (:issue:`10755`) |
| 398 | * :func:`~os.getgrouplist` (:issue:`9344`) |
| 399 | |
Giampaolo Rodolà | 424298a | 2011-03-03 18:34:06 +0000 | [diff] [blame] | 400 | |
Éric Araujo | 765e94f | 2011-06-03 17:26:59 +0200 | [diff] [blame] | 401 | packaging |
| 402 | --------- |
| 403 | |
| 404 | :mod:`distutils` has undergone additions and refactoring under a new name, |
| 405 | :mod:`packaging`, to allow developers to break backward compatibility. |
| 406 | :mod:`distutils` is still provided in the standard library, but users are |
| 407 | encouraged to transition to :mod:`packaging`. For older versions of Python, a |
| 408 | backport compatible with 2.4+ and 3.1+ will be made available on PyPI under the |
| 409 | name :mod:`distutils2`. |
| 410 | |
| 411 | .. TODO add examples and howto to the packaging docs and link to them |
| 412 | |
| 413 | |
Victor Stinner | 383c3fc | 2011-05-25 01:35:05 +0200 | [diff] [blame] | 414 | pydoc |
| 415 | ----- |
| 416 | |
Victor Stinner | 6daa33c | 2011-05-25 01:41:22 +0200 | [diff] [blame] | 417 | The Tk GUI and the :func:`~pydoc.serve` function have been removed from the |
| 418 | :mod:`pydoc` module: ``pydoc -g`` and :func:`~pydoc.serve` have been deprecated |
| 419 | in Python 3.2. |
Victor Stinner | 383c3fc | 2011-05-25 01:35:05 +0200 | [diff] [blame] | 420 | |
| 421 | |
Victor Stinner | d5c355c | 2011-04-30 14:53:09 +0200 | [diff] [blame] | 422 | sys |
| 423 | --- |
Victor Stinner | 754851f | 2011-04-19 23:58:51 +0200 | [diff] [blame] | 424 | |
Éric Araujo | 84b8ed8 | 2011-08-29 21:42:47 +0200 | [diff] [blame] | 425 | * 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] | 426 | sequence` holding informations about the thread implementation. |
Victor Stinner | 754851f | 2011-04-19 23:58:51 +0200 | [diff] [blame] | 427 | |
Georg Brandl | 00db582 | 2011-04-30 15:30:03 +0200 | [diff] [blame] | 428 | (:issue:`11223`) |
Victor Stinner | a929335 | 2011-04-30 15:21:58 +0200 | [diff] [blame] | 429 | |
Victor Stinner | fa0e3d5 | 2011-05-09 01:01:09 +0200 | [diff] [blame] | 430 | |
Victor Stinner | a929335 | 2011-04-30 15:21:58 +0200 | [diff] [blame] | 431 | signal |
| 432 | ------ |
| 433 | |
Victor Stinner | fa0e3d5 | 2011-05-09 01:01:09 +0200 | [diff] [blame] | 434 | * The :mod:`signal` module has new functions: |
Victor Stinner | a929335 | 2011-04-30 15:21:58 +0200 | [diff] [blame] | 435 | |
Victor Stinner | b3e7219 | 2011-05-08 01:46:11 +0200 | [diff] [blame] | 436 | * :func:`~signal.pthread_sigmask`: fetch and/or change the signal mask of the |
| 437 | calling thread (Contributed by Jean-Paul Calderone in :issue:`8407`) ; |
| 438 | * :func:`~signal.pthread_kill`: send a signal to a thread ; |
| 439 | * :func:`~signal.sigpending`: examine pending functions ; |
| 440 | * :func:`~signal.sigwait`: wait a signal. |
Ross Lagerwall | bc80822 | 2011-06-25 12:13:40 +0200 | [diff] [blame] | 441 | * :func:`~signal.sigwaitinfo`: wait for a signal, returning detailed |
| 442 | information about it. |
| 443 | * :func:`~signal.sigtimedwait`: like :func:`~signal.sigwaitinfo` but with a |
| 444 | timeout. |
Victor Stinner | a929335 | 2011-04-30 15:21:58 +0200 | [diff] [blame] | 445 | |
Victor Stinner | d49b1f1 | 2011-05-08 02:03:15 +0200 | [diff] [blame] | 446 | * The signal handler writes the signal number as a single byte instead of |
| 447 | a nul byte into the wakeup file descriptor. So it is possible to wait more |
| 448 | than one signal and know which signals were raised. |
| 449 | |
Victor Stinner | 388196e | 2011-05-10 17:13:00 +0200 | [diff] [blame] | 450 | * :func:`signal.signal` and :func:`signal.siginterrupt` raise an OSError, |
| 451 | instead of a RuntimeError: OSError has an errno attribute. |
| 452 | |
Nick Coghlan | 96fe56a | 2011-08-22 11:55:57 +1000 | [diff] [blame] | 453 | socket |
| 454 | ------ |
| 455 | |
Charles-François Natali | 47413c1 | 2011-10-06 19:47:44 +0200 | [diff] [blame] | 456 | * The :class:`~socket.socket` class now exposes additional methods to process |
| 457 | ancillary data when supported by the underlying platform: |
Nick Coghlan | 96fe56a | 2011-08-22 11:55:57 +1000 | [diff] [blame] | 458 | |
Charles-François Natali | 47413c1 | 2011-10-06 19:47:44 +0200 | [diff] [blame] | 459 | * :func:`~socket.socket.sendmsg` |
| 460 | * :func:`~socket.socket.recvmsg` |
| 461 | * :func:`~socket.socket.recvmsg_into` |
Nick Coghlan | 96fe56a | 2011-08-22 11:55:57 +1000 | [diff] [blame] | 462 | |
Charles-François Natali | 47413c1 | 2011-10-06 19:47:44 +0200 | [diff] [blame] | 463 | (Contributed by David Watson in :issue:`6560`, based on an earlier patch by |
| 464 | Heiko Wundram) |
| 465 | |
| 466 | * The :class:`~socket.socket` class now supports the PF_CAN protocol family |
| 467 | (http://en.wikipedia.org/wiki/Socketcan), on Linux |
| 468 | (http://lwn.net/Articles/253425). |
| 469 | |
| 470 | (Contributed by Matthias Fuchs, updated by Tiago Gonçalves in :issue:`10141`) |
| 471 | |
Victor Stinner | 754851f | 2011-04-19 23:58:51 +0200 | [diff] [blame] | 472 | |
Victor Stinner | 99c8b16 | 2011-05-24 12:05:19 +0200 | [diff] [blame] | 473 | ssl |
| 474 | --- |
| 475 | |
| 476 | The :mod:`ssl` module has new functions: |
| 477 | |
| 478 | * :func:`~ssl.RAND_bytes`: generate cryptographically strong |
| 479 | pseudo-random bytes. |
| 480 | * :func:`~ssl.RAND_pseudo_bytes`: generate pseudo-random bytes. |
| 481 | |
| 482 | |
Giampaolo Rodola' | 210e7ca | 2011-07-01 13:55:36 +0200 | [diff] [blame] | 483 | shutil |
| 484 | ------ |
| 485 | |
Sandro Tosi | aec2f21 | 2011-08-23 00:58:21 +0200 | [diff] [blame] | 486 | * The :mod:`shutil` module has these new fuctions: |
Giampaolo Rodola' | 210e7ca | 2011-07-01 13:55:36 +0200 | [diff] [blame] | 487 | |
Sandro Tosi | aec2f21 | 2011-08-23 00:58:21 +0200 | [diff] [blame] | 488 | * :func:`~shutil.disk_usage`: provides total, used and free disk space |
| 489 | statistics. (Contributed by Giampaolo Rodolà in :issue:`12442`) |
| 490 | * :func:`~shutil.chown`: allows one to change user and/or group of the given |
| 491 | path also specifying the user/group names and not only their numeric |
| 492 | ids. (Contributed by Sandro Tosi in :issue:`12191`) |
Giampaolo Rodola' | 096dcb1 | 2011-06-27 11:17:51 +0200 | [diff] [blame] | 493 | |
Senthil Kumaran | de49d64 | 2011-10-16 23:54:44 +0800 | [diff] [blame] | 494 | urllib |
| 495 | ------ |
| 496 | |
| 497 | The :class:`~urllib.request.Request` class, now accepts a *method* argument |
| 498 | used by :meth:`~urllib.request.Request.get_method` to determine what HTTP method |
Senthil Kumaran | a41c942 | 2011-10-20 02:37:08 +0800 | [diff] [blame] | 499 | should be used. For example, this will send a ``'HEAD'`` request:: |
Senthil Kumaran | de49d64 | 2011-10-16 23:54:44 +0800 | [diff] [blame] | 500 | |
| 501 | >>> urlopen(Request('http://www.python.org', method='HEAD')) |
| 502 | |
| 503 | (:issue:`1673007`) |
Giampaolo Rodola' | 096dcb1 | 2011-06-27 11:17:51 +0200 | [diff] [blame] | 504 | |
Giampaolo Rodolà | 3108f98 | 2011-02-24 20:59:48 +0000 | [diff] [blame] | 505 | Optimizations |
| 506 | ============= |
| 507 | |
| 508 | Major performance enhancements have been added: |
| 509 | |
| 510 | * Stub |
| 511 | |
| 512 | |
| 513 | Build and C API Changes |
| 514 | ======================= |
| 515 | |
| 516 | Changes to Python's build process and to the C API include: |
| 517 | |
| 518 | * Stub |
| 519 | |
| 520 | |
Georg Brandl | 0cd25c9 | 2011-04-29 13:45:54 +0200 | [diff] [blame] | 521 | Unsupported Operating Systems |
Victor Stinner | b90db4c | 2011-04-26 22:48:24 +0200 | [diff] [blame] | 522 | ============================= |
| 523 | |
Brian Curtin | 49a40cd | 2011-05-02 22:30:06 -0500 | [diff] [blame] | 524 | OS/2 and VMS are no longer supported due to the lack of a maintainer. |
| 525 | |
| 526 | Windows 2000 and Windows platforms which set ``COMSPEC`` to ``command.com`` |
| 527 | are no longer supported due to maintenance burden. |
Victor Stinner | b90db4c | 2011-04-26 22:48:24 +0200 | [diff] [blame] | 528 | |
| 529 | |
Giampaolo Rodolà | 3108f98 | 2011-02-24 20:59:48 +0000 | [diff] [blame] | 530 | Porting to Python 3.3 |
| 531 | ===================== |
| 532 | |
| 533 | This section lists previously described changes and other bugfixes |
| 534 | that may require changes to your code: |
| 535 | |
Victor Stinner | ff3d939 | 2011-08-20 23:39:26 +0200 | [diff] [blame] | 536 | * Issue #12326: On Linux, sys.platform doesn't contain the major version |
| 537 | anymore. It is now always 'linux', instead of 'linux2' or 'linux3' depending |
| 538 | on the Linux version used to build Python. Replace sys.platform == 'linux2' |
| 539 | with sys.platform.startswith('linux'), or directly sys.platform == 'linux' if |
| 540 | you don't need to support older Python versions. |
Éric Araujo | c09fca6 | 2011-03-23 02:06:24 +0100 | [diff] [blame] | 541 | |
| 542 | .. Issue #11591: When :program:`python` was started with :option:`-S`, |
| 543 | ``import site`` will not add site-specific paths to the module search |
| 544 | paths. In previous versions, it did. See changeset for doc changes in |
| 545 | various files. Contributed by Carl Meyer with editions by Éric Araujo. |
Éric Araujo | be3bd57 | 2011-03-26 01:55:15 +0100 | [diff] [blame] | 546 | |
| 547 | .. Issue #10998: -Q command-line flags are related artifacts have been |
| 548 | removed. Code checking sys.flags.division_warning will need updating. |
| 549 | Contributed by Éric Araujo. |
Victor Stinner | 7d637ab | 2011-09-29 02:56:16 +0200 | [diff] [blame] | 550 | |
| 551 | * :pep:`393`: The :c:type:`Py_UNICODE` type and all functions using this type |
| 552 | are deprecated. To fully benefit of the memory footprint reduction provided |
| 553 | by the PEP 393, you have to convert your code to the new Unicode API. Read |
| 554 | the porting guide: XXX. |
| 555 | |