mirror of https://github.com/python/cpython
263 lines
7.9 KiB
ReStructuredText
263 lines
7.9 KiB
ReStructuredText
****************************
|
|
What's New In Python 3.6
|
|
****************************
|
|
|
|
:Release: |release|
|
|
:Date: |today|
|
|
|
|
.. Rules for maintenance:
|
|
|
|
* Anyone can add text to this document. Do not spend very much time
|
|
on the wording of your changes, because your text will probably
|
|
get rewritten to some degree.
|
|
|
|
* The maintainer will go through Misc/NEWS periodically and add
|
|
changes; it's therefore more important to add your changes to
|
|
Misc/NEWS than to this file.
|
|
|
|
* This is not a complete list of every single change; completeness
|
|
is the purpose of Misc/NEWS. Some changes I consider too small
|
|
or esoteric to include. If such a change is added to the text,
|
|
I'll just remove it. (This is another reason you shouldn't spend
|
|
too much time on writing your addition.)
|
|
|
|
* If you want to draw your new text to the attention of the
|
|
maintainer, add 'XXX' to the beginning of the paragraph or
|
|
section.
|
|
|
|
* It's OK to just add a fragmentary note about a change. For
|
|
example: "XXX Describe the transmogrify() function added to the
|
|
socket module." The maintainer will research the change and
|
|
write the necessary text.
|
|
|
|
* You can comment out your additions if you like, but it's not
|
|
necessary (especially when a final release is some months away).
|
|
|
|
* Credit the author of a patch or bugfix. Just the name is
|
|
sufficient; the e-mail address isn't necessary.
|
|
|
|
* It's helpful to add the bug/patch number as a comment:
|
|
|
|
XXX Describe the transmogrify() function added to the socket
|
|
module.
|
|
(Contributed by P.Y. Developer in :issue:`12345`.)
|
|
|
|
This saves the maintainer the effort of going through the Mercurial log
|
|
when researching a change.
|
|
|
|
This article explains the new features in Python 3.6, compared to 3.5.
|
|
|
|
For full details, see the :source:`Misc/NEWS` file.
|
|
|
|
.. note::
|
|
|
|
Prerelease users should be aware that this document is currently in draft
|
|
form. It will be updated substantially as Python 3.6 moves towards release,
|
|
so it's worth checking back even after reading earlier versions.
|
|
|
|
|
|
Summary -- Release highlights
|
|
=============================
|
|
|
|
.. This section singles out the most important changes in Python 3.6.
|
|
Brevity is key.
|
|
|
|
* None yet.
|
|
|
|
.. PEP-sized items next.
|
|
|
|
.. _pep-4XX:
|
|
|
|
.. PEP 4XX: Virtual Environments
|
|
.. =============================
|
|
|
|
|
|
.. (Implemented by Foo Bar.)
|
|
|
|
.. .. seealso::
|
|
|
|
:pep:`4XX` - Python Virtual Environments
|
|
PEP written by Carl Meyer
|
|
|
|
|
|
Other Language Changes
|
|
======================
|
|
|
|
* None yet.
|
|
|
|
|
|
New Modules
|
|
===========
|
|
|
|
* None yet.
|
|
|
|
|
|
Improved Modules
|
|
================
|
|
|
|
datetime
|
|
--------
|
|
|
|
The :meth:`datetime.strftime() <datetime.datetime.strftime>` and
|
|
:meth:`date.strftime() <datetime.date.strftime>` methods now support ISO 8601 date
|
|
directives ``%G``, ``%u`` and ``%V``.
|
|
(Contributed by Ashley Anderson in :issue:`12006`.)
|
|
|
|
|
|
pickle
|
|
------
|
|
|
|
Objects that need calling ``__new__`` with keyword arguments can now be pickled
|
|
using :ref:`pickle protocols <pickle-protocols>` older than protocol version 4.
|
|
Protocol version 4 already supports this case. (Contributed by Serhiy
|
|
Storchaka in :issue:`24164`.)
|
|
|
|
|
|
rlcompleter
|
|
-----------
|
|
|
|
Private and special attribute names now are omitted unless the prefix starts
|
|
with underscores. A space or a colon is added after some completed keywords.
|
|
(Contributed by Serhiy Storchaka in :issue:`25011` and :issue:`25209`.)
|
|
|
|
Names of most attributes listed by :func:`dir` are now completed.
|
|
Previously, names of properties and slots which were not yet created on
|
|
an instance were excluded. (Contributed by Martin Panter in :issue:`25590`.)
|
|
|
|
|
|
telnetlib
|
|
---------
|
|
|
|
:class:`~telnetlib.Telnet` is now a context manager (contributed by
|
|
Stéphane Wirtel in :issue:`25485`).
|
|
|
|
|
|
urllib.robotparser
|
|
------------------
|
|
|
|
:class:`~urllib.robotparser.RobotFileParser` now supports the ``Crawl-delay`` and
|
|
``Request-rate`` extensions.
|
|
(Contributed by Nikolay Bogoychev in :issue:`16099`.)
|
|
|
|
|
|
Optimizations
|
|
=============
|
|
|
|
* The ASCII decoder is now up to 60 times as fast for error handlers
|
|
``surrogateescape``, ``ignore`` and ``replace`` (Contributed
|
|
by Victor Stinner in :issue:`24870`).
|
|
|
|
* The ASCII and the Latin1 encoders are now up to 3 times as fast for the
|
|
error handler ``surrogateescape`` (Contributed by Victor Stinner in :issue:`25227`).
|
|
|
|
* The UTF-8 encoder is now up to 75 times as fast for error handlers
|
|
``ignore``, ``replace``, ``surrogateescape``, ``surrogatepass`` (Contributed
|
|
by Victor Stinner in :issue:`25267`).
|
|
|
|
* The UTF-8 decoder is now up to 15 times as fast for error handlers
|
|
``ignore``, ``replace`` and ``surrogateescape`` (Contributed
|
|
by Victor Stinner in :issue:`25301`).
|
|
|
|
* ``bytes % args`` is now up to 2 times faster. (Contributed by Victor Stinner
|
|
in :issue:`25349`).
|
|
|
|
* ``bytearray % args`` is now between 2.5 and 5 times faster. (Contributed by
|
|
Victor Stinner in :issue:`25399`).
|
|
|
|
* Optimize :meth:`bytes.fromhex` and :meth:`bytearray.fromhex`: they are now
|
|
between 2x and 3.5x faster. (Contributed by Victor Stinner in :issue:`25401`).
|
|
|
|
|
|
Build and C API Changes
|
|
=======================
|
|
|
|
* New :c:func:`Py_FinalizeEx` API which indicates if flushing buffered data
|
|
failed (:issue:`5319`).
|
|
|
|
|
|
Deprecated
|
|
==========
|
|
|
|
New Keywords
|
|
------------
|
|
|
|
``async`` and ``await`` are not recommended to be used as variable, class,
|
|
function or module names. Introduced by :pep:`492` in Python 3.5, they will
|
|
become proper keywords in Python 3.7.
|
|
|
|
|
|
Deprecated Python modules, functions and methods
|
|
------------------------------------------------
|
|
|
|
* :meth:`importlib.machinery.SourceFileLoader` and
|
|
:meth:`importlib.machinery.SourcelessFileLoader` are now deprecated. They
|
|
were the only remaining implementations of
|
|
:meth:`importlib.abc.Loader.load_module` in :mod:`importlib` that had not
|
|
been deprecated in previous versions of Python in favour of
|
|
:meth:`importlib.abc.Loader.exec_module`.
|
|
|
|
|
|
Deprecated functions and types of the C API
|
|
-------------------------------------------
|
|
|
|
* None yet.
|
|
|
|
|
|
Deprecated features
|
|
-------------------
|
|
|
|
* The ``pyvenv`` script has been deprecated in favour of ``python3 -m venv``.
|
|
This prevents confusion as to what Python interpreter ``pyvenv`` is
|
|
connected to and thus what Python interpreter will be used by the virtual
|
|
environment. See :issue:`25154`.
|
|
|
|
|
|
Removed
|
|
=======
|
|
|
|
API and Feature Removals
|
|
------------------------
|
|
|
|
* ``inspect.getargspec()`` was removed (was deprecated since CPython 3.0).
|
|
:func:`inspect.getfullargspec` is an almost drop in replacement.
|
|
|
|
* ``inspect.getmoduleinfo()`` was removed (was deprecated since CPython 3.3).
|
|
:func:`inspect.getmodulename` should be used for obtaining the module
|
|
name for a given path.
|
|
|
|
|
|
Porting to Python 3.6
|
|
=====================
|
|
|
|
This section lists previously described changes and other bugfixes
|
|
that may require changes to your code.
|
|
|
|
Changes in the Python API
|
|
-------------------------
|
|
|
|
* The functions in the :mod:`compileall` module now return booleans instead
|
|
of ``1`` or ``0`` to represent success or failure, respectively. Thanks to
|
|
booleans being a subclass of integers, this should only be an issue if you
|
|
were doing identity checks for ``1`` or ``0``. See :issue:`25768`.
|
|
|
|
* Reading the :attr:`~urllib.parse.SplitResult.port` attribute of
|
|
:func:`urllib.parse.urlsplit` and :func:`~urllib.parse.urlparse` results
|
|
now raises :exc:`ValueError` for out-of-range values, rather than
|
|
returning :const:`None`. See :issue:`20059`.
|
|
|
|
* The :mod:`imp` module now raises a :exc:`DeprecationWarning` instead of
|
|
:exc:`PendingDeprecationWarning`.
|
|
|
|
* The following modules have had missing APIs added to their :attr:`__all__`
|
|
attributes to match the documented APIs: :mod:`csv`, :mod:`enum`,
|
|
:mod:`ftplib`, :mod:`logging`, :mod:`optparse`, :mod:`threading` and
|
|
:mod:`wave`. This means they will export new symbols when ``import *``
|
|
is used. See :issue:`23883`.
|
|
|
|
|
|
Changes in the C API
|
|
--------------------
|
|
|
|
* :c:func:`Py_Exit` (and the main interpreter) now override the exit status
|
|
with 120 if flushing buffered data failed. See :issue:`5319`.
|