Yury Selivanov | d1da507 | 2015-05-27 22:09:10 -0400 | [diff] [blame] | 1 | **************************** |
| 2 | What's New In Python 3.6 |
| 3 | **************************** |
| 4 | |
| 5 | :Release: |release| |
| 6 | :Date: |today| |
| 7 | |
| 8 | .. Rules for maintenance: |
| 9 | |
| 10 | * Anyone can add text to this document. Do not spend very much time |
| 11 | on the wording of your changes, because your text will probably |
| 12 | get rewritten to some degree. |
| 13 | |
| 14 | * The maintainer will go through Misc/NEWS periodically and add |
| 15 | changes; it's therefore more important to add your changes to |
| 16 | Misc/NEWS than to this file. |
| 17 | |
| 18 | * This is not a complete list of every single change; completeness |
| 19 | is the purpose of Misc/NEWS. Some changes I consider too small |
| 20 | or esoteric to include. If such a change is added to the text, |
| 21 | I'll just remove it. (This is another reason you shouldn't spend |
| 22 | too much time on writing your addition.) |
| 23 | |
| 24 | * If you want to draw your new text to the attention of the |
| 25 | maintainer, add 'XXX' to the beginning of the paragraph or |
| 26 | section. |
| 27 | |
| 28 | * It's OK to just add a fragmentary note about a change. For |
| 29 | example: "XXX Describe the transmogrify() function added to the |
| 30 | socket module." The maintainer will research the change and |
| 31 | write the necessary text. |
| 32 | |
| 33 | * You can comment out your additions if you like, but it's not |
| 34 | necessary (especially when a final release is some months away). |
| 35 | |
| 36 | * Credit the author of a patch or bugfix. Just the name is |
| 37 | sufficient; the e-mail address isn't necessary. |
| 38 | |
| 39 | * It's helpful to add the bug/patch number as a comment: |
| 40 | |
| 41 | XXX Describe the transmogrify() function added to the socket |
| 42 | module. |
| 43 | (Contributed by P.Y. Developer in :issue:`12345`.) |
| 44 | |
| 45 | This saves the maintainer the effort of going through the Mercurial log |
| 46 | when researching a change. |
| 47 | |
| 48 | This article explains the new features in Python 3.6, compared to 3.5. |
| 49 | |
| 50 | For full details, see the :source:`Misc/NEWS` file. |
| 51 | |
| 52 | .. note:: |
| 53 | |
| 54 | Prerelease users should be aware that this document is currently in draft |
| 55 | form. It will be updated substantially as Python 3.6 moves towards release, |
| 56 | so it's worth checking back even after reading earlier versions. |
| 57 | |
| 58 | |
| 59 | Summary -- Release highlights |
| 60 | ============================= |
| 61 | |
| 62 | .. This section singles out the most important changes in Python 3.6. |
| 63 | Brevity is key. |
| 64 | |
| 65 | * None yet. |
| 66 | |
| 67 | .. PEP-sized items next. |
| 68 | |
| 69 | .. _pep-4XX: |
| 70 | |
| 71 | .. PEP 4XX: Virtual Environments |
| 72 | .. ============================= |
| 73 | |
| 74 | |
| 75 | .. (Implemented by Foo Bar.) |
| 76 | |
| 77 | .. .. seealso:: |
| 78 | |
| 79 | :pep:`4XX` - Python Virtual Environments |
| 80 | PEP written by Carl Meyer |
| 81 | |
| 82 | |
| 83 | Other Language Changes |
| 84 | ====================== |
| 85 | |
| 86 | * None yet. |
| 87 | |
| 88 | |
| 89 | New Modules |
| 90 | =========== |
| 91 | |
| 92 | * None yet. |
| 93 | |
| 94 | |
| 95 | Improved Modules |
| 96 | ================ |
| 97 | |
Berker Peksag | b6c9572 | 2015-10-08 13:58:49 +0300 | [diff] [blame] | 98 | datetime |
| 99 | -------- |
| 100 | |
Martin Panter | fad4b60 | 2015-11-14 01:29:17 +0000 | [diff] [blame] | 101 | The :meth:`datetime.strftime() <datetime.datetime.strftime>` and |
| 102 | :meth:`date.strftime() <datetime.date.strftime>` methods now support ISO 8601 date |
Berker Peksag | b6c9572 | 2015-10-08 13:58:49 +0300 | [diff] [blame] | 103 | directives ``%G``, ``%u`` and ``%V``. |
| 104 | (Contributed by Ashley Anderson in :issue:`12006`.) |
| 105 | |
| 106 | |
Serhiy Storchaka | 0d554d7 | 2015-10-10 22:42:18 +0300 | [diff] [blame] | 107 | pickle |
| 108 | ------ |
| 109 | |
Martin Panter | fad4b60 | 2015-11-14 01:29:17 +0000 | [diff] [blame] | 110 | Objects that need calling ``__new__`` with keyword arguments can now be pickled |
Serhiy Storchaka | 0d554d7 | 2015-10-10 22:42:18 +0300 | [diff] [blame] | 111 | using :ref:`pickle protocols <pickle-protocols>` older than protocol version 4. |
| 112 | Protocol version 4 already supports this case. (Contributed by Serhiy |
| 113 | Storchaka in :issue:`24164`.) |
| 114 | |
| 115 | |
Martin Panter | fad4b60 | 2015-11-14 01:29:17 +0000 | [diff] [blame] | 116 | rlcompleter |
| 117 | ----------- |
Serhiy Storchaka | ab82422 | 2015-09-27 13:43:50 +0300 | [diff] [blame] | 118 | |
| 119 | Private and special attribute names now are omitted unless the prefix starts |
Martin Panter | fad4b60 | 2015-11-14 01:29:17 +0000 | [diff] [blame] | 120 | with underscores. A space or a colon is added after some completed keywords. |
Serhiy Storchaka | ab82422 | 2015-09-27 13:43:50 +0300 | [diff] [blame] | 121 | (Contributed by Serhiy Storchaka in :issue:`25011` and :issue:`25209`.) |
| 122 | |
Martin Panter | 6fe3926 | 2015-11-13 23:54:02 +0000 | [diff] [blame] | 123 | Names of most attributes listed by :func:`dir` are now completed. |
| 124 | Previously, names of properties and slots which were not yet created on |
| 125 | an instance were excluded. (Contributed by Martin Panter in :issue:`25590`.) |
| 126 | |
Serhiy Storchaka | ab82422 | 2015-09-27 13:43:50 +0300 | [diff] [blame] | 127 | |
R David Murray | 4f09806 | 2015-11-28 12:24:52 -0500 | [diff] [blame] | 128 | telnetlib |
| 129 | --------- |
| 130 | |
| 131 | :class:`~telnetlib.Telnet` is now a context manager (contributed by |
| 132 | Stéphane Wirtel in :issue:`25485`). |
| 133 | |
| 134 | |
Berker Peksag | 960e848 | 2015-10-08 12:27:06 +0300 | [diff] [blame] | 135 | urllib.robotparser |
| 136 | ------------------ |
| 137 | |
Martin Panter | fad4b60 | 2015-11-14 01:29:17 +0000 | [diff] [blame] | 138 | :class:`~urllib.robotparser.RobotFileParser` now supports the ``Crawl-delay`` and |
Berker Peksag | 960e848 | 2015-10-08 12:27:06 +0300 | [diff] [blame] | 139 | ``Request-rate`` extensions. |
| 140 | (Contributed by Nikolay Bogoychev in :issue:`16099`.) |
| 141 | |
| 142 | |
Yury Selivanov | d1da507 | 2015-05-27 22:09:10 -0400 | [diff] [blame] | 143 | Optimizations |
| 144 | ============= |
| 145 | |
Martin Panter | fad4b60 | 2015-11-14 01:29:17 +0000 | [diff] [blame] | 146 | * The ASCII decoder is now up to 60 times as fast for error handlers |
Victor Stinner | ebcf9ed | 2015-10-14 10:10:00 +0200 | [diff] [blame] | 147 | ``surrogateescape``, ``ignore`` and ``replace`` (Contributed |
| 148 | by Victor Stinner in :issue:`24870`). |
Yury Selivanov | d1da507 | 2015-05-27 22:09:10 -0400 | [diff] [blame] | 149 | |
Terry Jan Reedy | 6dc9ce1 | 2015-10-20 01:07:53 -0400 | [diff] [blame] | 150 | * The ASCII and the Latin1 encoders are now up to 3 times as fast for the |
Martin Panter | fad4b60 | 2015-11-14 01:29:17 +0000 | [diff] [blame] | 151 | error handler ``surrogateescape`` (Contributed by Victor Stinner in :issue:`25227`). |
Victor Stinner | c3713e9 | 2015-09-29 12:32:13 +0200 | [diff] [blame] | 152 | |
Martin Panter | fad4b60 | 2015-11-14 01:29:17 +0000 | [diff] [blame] | 153 | * The UTF-8 encoder is now up to 75 times as fast for error handlers |
Victor Stinner | ebcf9ed | 2015-10-14 10:10:00 +0200 | [diff] [blame] | 154 | ``ignore``, ``replace``, ``surrogateescape``, ``surrogatepass`` (Contributed |
| 155 | by Victor Stinner in :issue:`25267`). |
Victor Stinner | 01ada39 | 2015-10-01 21:54:51 +0200 | [diff] [blame] | 156 | |
Martin Panter | fad4b60 | 2015-11-14 01:29:17 +0000 | [diff] [blame] | 157 | * The UTF-8 decoder is now up to 15 times as fast for error handlers |
Victor Stinner | ebcf9ed | 2015-10-14 10:10:00 +0200 | [diff] [blame] | 158 | ``ignore``, ``replace`` and ``surrogateescape`` (Contributed |
| 159 | by Victor Stinner in :issue:`25301`). |
| 160 | |
| 161 | * ``bytes % args`` is now up to 2 times faster. (Contributed by Victor Stinner |
| 162 | in :issue:`25349`). |
| 163 | |
| 164 | * ``bytearray % args`` is now between 2.5 and 5 times faster. (Contributed by |
| 165 | Victor Stinner in :issue:`25399`). |
Victor Stinner | 1d65d91 | 2015-10-05 13:43:50 +0200 | [diff] [blame] | 166 | |
Victor Stinner | 2bf8993 | 2015-10-14 11:25:33 +0200 | [diff] [blame] | 167 | * Optimize :meth:`bytes.fromhex` and :meth:`bytearray.fromhex`: they are now |
| 168 | between 2x and 3.5x faster. (Contributed by Victor Stinner in :issue:`25401`). |
| 169 | |
Yury Selivanov | d1da507 | 2015-05-27 22:09:10 -0400 | [diff] [blame] | 170 | |
| 171 | Build and C API Changes |
| 172 | ======================= |
| 173 | |
Martin Panter | b4ce1fc | 2015-11-30 03:18:29 +0000 | [diff] [blame] | 174 | * New :c:func:`Py_FinalizeEx` API which indicates if flushing buffered data |
| 175 | failed (:issue:`5319`). |
Yury Selivanov | d1da507 | 2015-05-27 22:09:10 -0400 | [diff] [blame] | 176 | |
| 177 | |
| 178 | Deprecated |
| 179 | ========== |
| 180 | |
Yury Selivanov | 7a21911 | 2015-05-28 17:10:29 -0400 | [diff] [blame] | 181 | New Keywords |
| 182 | ------------ |
| 183 | |
Yury Selivanov | 62f27b5 | 2015-08-03 14:57:21 -0400 | [diff] [blame] | 184 | ``async`` and ``await`` are not recommended to be used as variable, class, |
| 185 | function or module names. Introduced by :pep:`492` in Python 3.5, they will |
| 186 | become proper keywords in Python 3.7. |
Yury Selivanov | 7a21911 | 2015-05-28 17:10:29 -0400 | [diff] [blame] | 187 | |
| 188 | |
Yury Selivanov | d1da507 | 2015-05-27 22:09:10 -0400 | [diff] [blame] | 189 | Deprecated Python modules, functions and methods |
| 190 | ------------------------------------------------ |
| 191 | |
Brett Cannon | eae3079 | 2015-12-28 17:55:27 -0800 | [diff] [blame] | 192 | * :meth:`importlib.machinery.SourceFileLoader` and |
| 193 | :meth:`importlib.machinery.SourcelessFileLoader` are now deprecated. They |
| 194 | were the only remaining implementations of |
| 195 | :meth:`importlib.abc.Loader.load_module` in :mod:`importlib` that had not |
| 196 | been deprecated in previous versions of Python in favour of |
| 197 | :meth:`importlib.abc.Loader.exec_module`. |
Yury Selivanov | d1da507 | 2015-05-27 22:09:10 -0400 | [diff] [blame] | 198 | |
| 199 | |
| 200 | Deprecated functions and types of the C API |
| 201 | ------------------------------------------- |
| 202 | |
| 203 | * None yet. |
| 204 | |
| 205 | |
| 206 | Deprecated features |
| 207 | ------------------- |
| 208 | |
Brett Cannon | 9b63868 | 2015-10-16 15:14:27 -0700 | [diff] [blame] | 209 | * The ``pyvenv`` script has been deprecated in favour of ``python3 -m venv``. |
| 210 | This prevents confusion as to what Python interpreter ``pyvenv`` is |
| 211 | connected to and thus what Python interpreter will be used by the virtual |
Brett Cannon | 63b8505 | 2016-01-15 13:33:03 -0800 | [diff] [blame^] | 212 | environment. (Contributed by Brett Cannon in :issue:`25154`.) |
| 213 | |
| 214 | * When performing a relative import, falling back on ``__name__`` and |
| 215 | ``__path__`` from the calling module when ``__spec__`` or |
| 216 | ``__package__`` are not defined now raises an :exc:`ImportWarning`. |
| 217 | (Contributed by Rose Ames in :issue:`25791`.) |
Yury Selivanov | d1da507 | 2015-05-27 22:09:10 -0400 | [diff] [blame] | 218 | |
| 219 | |
| 220 | Removed |
| 221 | ======= |
| 222 | |
| 223 | API and Feature Removals |
| 224 | ------------------------ |
| 225 | |
Yury Selivanov | 5661316 | 2015-07-23 17:51:34 +0300 | [diff] [blame] | 226 | * ``inspect.getmoduleinfo()`` was removed (was deprecated since CPython 3.3). |
Yury Selivanov | 6dfbc5d | 2015-07-23 17:49:00 +0300 | [diff] [blame] | 227 | :func:`inspect.getmodulename` should be used for obtaining the module |
| 228 | name for a given path. |
| 229 | |
Yury Selivanov | d1da507 | 2015-05-27 22:09:10 -0400 | [diff] [blame] | 230 | |
| 231 | Porting to Python 3.6 |
| 232 | ===================== |
| 233 | |
| 234 | This section lists previously described changes and other bugfixes |
| 235 | that may require changes to your code. |
| 236 | |
| 237 | Changes in the Python API |
| 238 | ------------------------- |
| 239 | |
Brett Cannon | 1e3c3e9 | 2015-12-27 13:17:04 -0800 | [diff] [blame] | 240 | * The functions in the :mod:`compileall` module now return booleans instead |
| 241 | of ``1`` or ``0`` to represent success or failure, respectively. Thanks to |
| 242 | booleans being a subclass of integers, this should only be an issue if you |
| 243 | were doing identity checks for ``1`` or ``0``. See :issue:`25768`. |
| 244 | |
Robert Collins | dfa95c9 | 2015-08-10 09:53:30 +1200 | [diff] [blame] | 245 | * Reading the :attr:`~urllib.parse.SplitResult.port` attribute of |
| 246 | :func:`urllib.parse.urlsplit` and :func:`~urllib.parse.urlparse` results |
| 247 | now raises :exc:`ValueError` for out-of-range values, rather than |
| 248 | returning :const:`None`. See :issue:`20059`. |
Yury Selivanov | d1da507 | 2015-05-27 22:09:10 -0400 | [diff] [blame] | 249 | |
Brett Cannon | c0d91af | 2015-10-16 12:21:37 -0700 | [diff] [blame] | 250 | * The :mod:`imp` module now raises a :exc:`DeprecationWarning` instead of |
| 251 | :exc:`PendingDeprecationWarning`. |
| 252 | |
Martin Panter | 28a465c | 2015-11-14 12:52:08 +0000 | [diff] [blame] | 253 | * The following modules have had missing APIs added to their :attr:`__all__` |
| 254 | attributes to match the documented APIs: :mod:`csv`, :mod:`enum`, |
| 255 | :mod:`ftplib`, :mod:`logging`, :mod:`optparse`, :mod:`threading` and |
| 256 | :mod:`wave`. This means they will export new symbols when ``import *`` |
| 257 | is used. See :issue:`23883`. |
| 258 | |
Brett Cannon | 63b8505 | 2016-01-15 13:33:03 -0800 | [diff] [blame^] | 259 | * When performing a relative import, ``__spec__.parent`` is used |
| 260 | is ``__spec__`` is defined instead of ``__package__``. |
| 261 | (Contributed by Rose Ames in :issue:`25791`.) |
| 262 | |
Yury Selivanov | d1da507 | 2015-05-27 22:09:10 -0400 | [diff] [blame] | 263 | |
| 264 | Changes in the C API |
| 265 | -------------------- |
| 266 | |
Martin Panter | b4ce1fc | 2015-11-30 03:18:29 +0000 | [diff] [blame] | 267 | * :c:func:`Py_Exit` (and the main interpreter) now override the exit status |
| 268 | with 120 if flushing buffered data failed. See :issue:`5319`. |