mirror of https://github.com/python/cpython
253 lines
7.3 KiB
ReStructuredText
253 lines
7.3 KiB
ReStructuredText
****************************
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What's New In Python 3.6
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****************************
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:Release: |release|
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:Date: |today|
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.. Rules for maintenance:
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* Anyone can add text to this document. Do not spend very much time
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on the wording of your changes, because your text will probably
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get rewritten to some degree.
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* The maintainer will go through Misc/NEWS periodically and add
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changes; it's therefore more important to add your changes to
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Misc/NEWS than to this file.
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* This is not a complete list of every single change; completeness
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is the purpose of Misc/NEWS. Some changes I consider too small
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or esoteric to include. If such a change is added to the text,
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I'll just remove it. (This is another reason you shouldn't spend
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too much time on writing your addition.)
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* If you want to draw your new text to the attention of the
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maintainer, add 'XXX' to the beginning of the paragraph or
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section.
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* It's OK to just add a fragmentary note about a change. For
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example: "XXX Describe the transmogrify() function added to the
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socket module." The maintainer will research the change and
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write the necessary text.
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* You can comment out your additions if you like, but it's not
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necessary (especially when a final release is some months away).
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* Credit the author of a patch or bugfix. Just the name is
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sufficient; the e-mail address isn't necessary.
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* It's helpful to add the bug/patch number as a comment:
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XXX Describe the transmogrify() function added to the socket
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module.
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(Contributed by P.Y. Developer in :issue:`12345`.)
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This saves the maintainer the effort of going through the Mercurial log
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when researching a change.
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This article explains the new features in Python 3.6, compared to 3.5.
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For full details, see the :source:`Misc/NEWS` file.
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.. note::
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Prerelease users should be aware that this document is currently in draft
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form. It will be updated substantially as Python 3.6 moves towards release,
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so it's worth checking back even after reading earlier versions.
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Summary -- Release highlights
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=============================
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.. This section singles out the most important changes in Python 3.6.
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Brevity is key.
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* None yet.
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.. PEP-sized items next.
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.. _pep-4XX:
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.. PEP 4XX: Virtual Environments
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.. =============================
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.. (Implemented by Foo Bar.)
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.. .. seealso::
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:pep:`4XX` - Python Virtual Environments
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PEP written by Carl Meyer
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Other Language Changes
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======================
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* None yet.
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New Modules
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===========
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* None yet.
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Improved Modules
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================
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datetime
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--------
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The :meth:`datetime.strftime() <datetime.datetime.strftime>` and
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:meth:`date.strftime() <datetime.date.strftime>` methods now support ISO 8601 date
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directives ``%G``, ``%u`` and ``%V``.
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(Contributed by Ashley Anderson in :issue:`12006`.)
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pickle
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------
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Objects that need calling ``__new__`` with keyword arguments can now be pickled
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using :ref:`pickle protocols <pickle-protocols>` older than protocol version 4.
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Protocol version 4 already supports this case. (Contributed by Serhiy
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Storchaka in :issue:`24164`.)
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rlcompleter
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-----------
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Private and special attribute names now are omitted unless the prefix starts
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with underscores. A space or a colon is added after some completed keywords.
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(Contributed by Serhiy Storchaka in :issue:`25011` and :issue:`25209`.)
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Names of most attributes listed by :func:`dir` are now completed.
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Previously, names of properties and slots which were not yet created on
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an instance were excluded. (Contributed by Martin Panter in :issue:`25590`.)
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telnetlib
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---------
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:class:`~telnetlib.Telnet` is now a context manager (contributed by
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Stéphane Wirtel in :issue:`25485`).
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urllib.robotparser
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------------------
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:class:`~urllib.robotparser.RobotFileParser` now supports the ``Crawl-delay`` and
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``Request-rate`` extensions.
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(Contributed by Nikolay Bogoychev in :issue:`16099`.)
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Optimizations
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=============
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* The ASCII decoder is now up to 60 times as fast for error handlers
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``surrogateescape``, ``ignore`` and ``replace`` (Contributed
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by Victor Stinner in :issue:`24870`).
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* The ASCII and the Latin1 encoders are now up to 3 times as fast for the
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error handler ``surrogateescape`` (Contributed by Victor Stinner in :issue:`25227`).
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* The UTF-8 encoder is now up to 75 times as fast for error handlers
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``ignore``, ``replace``, ``surrogateescape``, ``surrogatepass`` (Contributed
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by Victor Stinner in :issue:`25267`).
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* The UTF-8 decoder is now up to 15 times as fast for error handlers
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``ignore``, ``replace`` and ``surrogateescape`` (Contributed
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by Victor Stinner in :issue:`25301`).
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* ``bytes % args`` is now up to 2 times faster. (Contributed by Victor Stinner
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in :issue:`25349`).
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* ``bytearray % args`` is now between 2.5 and 5 times faster. (Contributed by
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Victor Stinner in :issue:`25399`).
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* Optimize :meth:`bytes.fromhex` and :meth:`bytearray.fromhex`: they are now
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between 2x and 3.5x faster. (Contributed by Victor Stinner in :issue:`25401`).
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Build and C API Changes
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=======================
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* New :c:func:`Py_FinalizeEx` API which indicates if flushing buffered data
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failed (:issue:`5319`).
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Deprecated
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==========
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New Keywords
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------------
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``async`` and ``await`` are not recommended to be used as variable, class,
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function or module names. Introduced by :pep:`492` in Python 3.5, they will
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become proper keywords in Python 3.7.
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Deprecated Python modules, functions and methods
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------------------------------------------------
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* None yet.
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Deprecated functions and types of the C API
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-------------------------------------------
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* None yet.
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Deprecated features
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-------------------
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* The ``pyvenv`` script has been deprecated in favour of ``python3 -m venv``.
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This prevents confusion as to what Python interpreter ``pyvenv`` is
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connected to and thus what Python interpreter will be used by the virtual
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environment. See :issue:`25154`.
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Removed
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=======
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API and Feature Removals
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------------------------
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* ``inspect.getargspec()`` was removed (was deprecated since CPython 3.0).
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:func:`inspect.getfullargspec` is an almost drop in replacement.
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* ``inspect.getmoduleinfo()`` was removed (was deprecated since CPython 3.3).
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:func:`inspect.getmodulename` should be used for obtaining the module
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name for a given path.
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Porting to Python 3.6
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=====================
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This section lists previously described changes and other bugfixes
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that may require changes to your code.
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Changes in the Python API
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-------------------------
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* Reading the :attr:`~urllib.parse.SplitResult.port` attribute of
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:func:`urllib.parse.urlsplit` and :func:`~urllib.parse.urlparse` results
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now raises :exc:`ValueError` for out-of-range values, rather than
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returning :const:`None`. See :issue:`20059`.
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* The :mod:`imp` module now raises a :exc:`DeprecationWarning` instead of
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:exc:`PendingDeprecationWarning`.
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* The following modules have had missing APIs added to their :attr:`__all__`
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attributes to match the documented APIs: :mod:`csv`, :mod:`enum`,
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:mod:`ftplib`, :mod:`logging`, :mod:`optparse`, :mod:`threading` and
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:mod:`wave`. This means they will export new symbols when ``import *``
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is used. See :issue:`23883`.
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Changes in the C API
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--------------------
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* :c:func:`Py_Exit` (and the main interpreter) now override the exit status
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with 120 if flushing buffered data failed. See :issue:`5319`.
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