mirror of https://github.com/python/cpython
Rebased version of what's new PR (#16745)
* Use Unicode character for accent * Various grammar fixes * Sort library modules alphabetically; remove duplicated idlelib/IDLE section
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Andrew Kuchling
GitHub
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bb78f6cfa6
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@ -82,7 +82,7 @@ Assignment expressions
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----------------------
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There is new syntax ``:=`` that assigns values to variables as part of a larger
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expression. It is affectionately known as "walrus operator" due to
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expression. It is affectionately known as "the walrus operator" due to
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its resemblance to `the eyes and tusks of a walrus
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<https://en.wikipedia.org/wiki/Walrus#/media/File:Pacific_Walrus_-_Bull_(8247646168).jpg>`_.
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@ -620,6 +620,16 @@ where the DLL is stored (if a full or partial path is used to load the initial
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DLL) and paths added by :func:`~os.add_dll_directory`.
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datetime
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--------
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Added new alternate constructors :meth:`datetime.date.fromisocalendar` and
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:meth:`datetime.datetime.fromisocalendar`, which construct :class:`date` and
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:class:`datetime` objects respectively from ISO year, week number, and weekday;
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these are the inverse of each class's ``isocalendar`` method.
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(Contributed by Paul Ganssle in :issue:`36004`.)
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functools
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---------
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@ -637,14 +647,12 @@ than as a function returning a decorator. So both of these are now supported::
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(Contributed by Raymond Hettinger in :issue:`36772`.)
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datetime
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--------
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gc
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--
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Added new alternate constructors :meth:`datetime.date.fromisocalendar` and
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:meth:`datetime.datetime.fromisocalendar`, which construct :class:`date` and
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:class:`datetime` objects respectively from ISO year, week number and weekday;
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these are the inverse of each class's ``isocalendar`` method.
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(Contributed by Paul Ganssle in :issue:`36004`.)
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:func:`~gc.get_objects` can now receive an optional *generation* parameter
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indicating a generation to get objects from. Contributed in
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:issue:`36016` by Pablo Galindo.
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gettext
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@ -654,6 +662,18 @@ Added :func:`~gettext.pgettext` and its variants.
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(Contributed by Franz Glasner, Éric Araujo, and Cheryl Sabella in :issue:`2504`.)
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gzip
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----
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Added the *mtime* parameter to :func:`gzip.compress` for reproducible output.
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(Contributed by Guo Ci Teo in :issue:`34898`.)
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A :exc:`~gzip.BadGzipFile` exception is now raised instead of :exc:`OSError`
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for certain types of invalid or corrupt gzip files.
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(Contributed by Filip Gruszczyński, Michele Orrù, and Zackery Spytz in
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:issue:`6584`.)
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idlelib and IDLE
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----------------
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@ -704,44 +724,6 @@ fails. The exception is ignored silently by default in release build.
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(Contributed by Victor Stinner in :issue:`18748`.)
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gc
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--
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:func:`~gc.get_objects` can now receive an optional *generation* parameter
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indicating a generation to get objects from. Contributed in
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:issue:`36016` by Pablo Galindo.
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gzip
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----
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Added the *mtime* parameter to :func:`gzip.compress` for reproducible output.
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(Contributed by Guo Ci Teo in :issue:`34898`.)
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A :exc:`~gzip.BadGzipFile` exception is now raised instead of :exc:`OSError`
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for certain types of invalid or corrupt gzip files.
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(Contributed by Filip Gruszczyński, Michele Orrù, and Zackery Spytz in
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:issue:`6584`.)
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idlelib and IDLE
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----------------
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Add optional line numbers for IDLE editor windows. Windows
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open without line numbers unless set otherwise in the General
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tab of the configuration dialog.
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(Contributed by Tal Einat and Saimadhav Heblikar in :issue:`17535`.)
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Output over N lines (50 by default) is squeezed down to a button.
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N can be changed in the PyShell section of the General page of the
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Settings dialog. Fewer, but possibly extra long, lines can be squeezed by
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right clicking on the output. Squeezed output can be expanded in place
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by double-clicking the button or into the clipboard or a separate window
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by right-clicking the button. (Contributed by Tal Einat in :issue:`1529353`.)
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The changes above have been backported to 3.7 maintenance releases.
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json.tool
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---------
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@ -899,18 +881,6 @@ py_compile
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(Contributed by Joannah Nanjekye in :issue:`22640`.)
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socket
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------
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Added :meth:`~socket.create_server()` and :meth:`~socket.has_dualstack_ipv6()`
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convenience functions to automate the necessary tasks usually involved when
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creating a server socket, including accepting both IPv4 and IPv6 connections
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on the same socket. (Contributed by Giampaolo Rodola in :issue:`17561`.)
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The :func:`socket.if_nameindex()`, :func:`socket.if_nametoindex()`, and
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:func:`socket.if_indextoname()` functions have been implemented on Windows.
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(Contributed by Zackery Spytz in :issue:`37007`.)
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shlex
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----------
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@ -932,6 +902,19 @@ inherited from the corresponding change to the :mod:`tarfile` module.
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recursively removing their contents first.
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socket
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------
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Added :meth:`~socket.create_server()` and :meth:`~socket.has_dualstack_ipv6()`
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convenience functions to automate the necessary tasks usually involved when
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creating a server socket, including accepting both IPv4 and IPv6 connections
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on the same socket. (Contributed by Giampaolo Rodolà in :issue:`17561`.)
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The :func:`socket.if_nameindex()`, :func:`socket.if_nametoindex()`, and
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:func:`socket.if_indextoname()` functions have been implemented on Windows.
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(Contributed by Zackery Spytz in :issue:`37007`.)
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ssl
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---
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@ -1202,14 +1185,14 @@ Optimizations
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+26% on Linux, +50% on macOS and +40% on Windows. Also, much less CPU cycles
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are consumed.
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See :ref:`shutil-platform-dependent-efficient-copy-operations` section.
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(Contributed by Giampaolo Rodola' in :issue:`33671`.)
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(Contributed by Giampaolo Rodolà in :issue:`33671`.)
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* :func:`shutil.copytree` uses :func:`os.scandir` function and all copy
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functions depending from it use cached :func:`os.stat` values. The speedup
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for copying a directory with 8000 files is around +9% on Linux, +20% on
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Windows and +30% on a Windows SMB share. Also the number of :func:`os.stat`
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syscalls is reduced by 38% making :func:`shutil.copytree` especially faster
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on network filesystems. (Contributed by Giampaolo Rodola' in :issue:`33695`.)
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on network filesystems. (Contributed by Giampaolo Rodolà in :issue:`33695`.)
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* The default protocol in the :mod:`pickle` module is now Protocol 4,
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first introduced in Python 3.4. It offers better performance and smaller
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@ -1361,7 +1344,7 @@ Deprecated
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(Contributed by Victor Stinner in :issue:`37481`.)
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* Deprecated methods ``getchildren()`` and ``getiterator()`` in
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the :mod:`~xml.etree.ElementTree` module emit now a
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the :mod:`~xml.etree.ElementTree` module now emit a
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:exc:`DeprecationWarning` instead of :exc:`PendingDeprecationWarning`.
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They will be removed in Python 3.9.
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(Contributed by Serhiy Storchaka in :issue:`29209`.)
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@ -1454,28 +1437,29 @@ The following features and APIs have been removed from Python 3.8:
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* The :mod:`macpath` module, deprecated in Python 3.7, has been removed.
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(Contributed by Victor Stinner in :issue:`35471`.)
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* The function :func:`platform.popen` has been removed, it was deprecated since
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Python 3.3: use :func:`os.popen` instead.
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* The function :func:`platform.popen` has been removed, after having been
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deprecated since Python 3.3: use :func:`os.popen` instead.
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(Contributed by Victor Stinner in :issue:`35345`.)
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* The function :func:`time.clock` has been removed, it was deprecated since Python
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3.3: use :func:`time.perf_counter` or :func:`time.process_time` instead, depending
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on your requirements, to have a well defined behavior.
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* The function :func:`time.clock` has been removed, after having been
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deprecated since Python 3.3: use :func:`time.perf_counter` or
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:func:`time.process_time` instead, depending
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on your requirements, to have well-defined behavior.
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(Contributed by Matthias Bussonnier in :issue:`36895`.)
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* The ``pyvenv`` script has been removed in favor of ``python3.8 -m venv``
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to help eliminate confusion as to what Python interpreter the ``pyvenv``
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script is tied to. (Contributed by Brett Cannon in :issue:`25427`.)
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* ``parse_qs``, ``parse_qsl``, and ``escape`` are removed from :mod:`cgi`
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module. They are deprecated from Python 3.2 or older. They should be imported
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* ``parse_qs``, ``parse_qsl``, and ``escape`` are removed from the :mod:`cgi`
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module. They are deprecated in Python 3.2 or older. They should be imported
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from the ``urllib.parse`` and ``html`` modules instead.
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* ``filemode`` function is removed from :mod:`tarfile` module.
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* ``filemode`` function is removed from the :mod:`tarfile` module.
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It is not documented and deprecated since Python 3.3.
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* The :class:`~xml.etree.ElementTree.XMLParser` constructor no longer accepts
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the *html* argument. It never had effect and was deprecated in Python 3.4.
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the *html* argument. It never had an effect and was deprecated in Python 3.4.
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All other parameters are now :ref:`keyword-only <keyword-only_parameter>`.
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(Contributed by Serhiy Storchaka in :issue:`29209`.)
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@ -1534,8 +1518,8 @@ Changes in Python behavior
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* On AIX, :attr:`sys.platform` doesn't contain the major version anymore.
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It is always ``'aix'``, instead of ``'aix3'`` .. ``'aix7'``. Since
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older Python versions include the version number, it is recommended to
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always use the ``sys.platform.startswith('aix')``.
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older Python versions include the version number, so it is recommended to
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always use ``sys.platform.startswith('aix')``.
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(Contributed by M. Felt in :issue:`36588`.)
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* :c:func:`PyEval_AcquireLock` and :c:func:`PyEval_AcquireThread` now
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@ -1555,8 +1539,8 @@ Changes in the Python API
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* :class:`subprocess.Popen` can now use :func:`os.posix_spawn` in some cases
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for better performance. On Windows Subsystem for Linux and QEMU User
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Emulation, Popen constructor using :func:`os.posix_spawn` no longer raise an
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exception on errors like missing program, but the child process fails with a
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Emulation, the :class:`Popen` constructor using :func:`os.posix_spawn` no longer raises an
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exception on errors like "missing program". Instead the child process fails with a
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non-zero :attr:`~Popen.returncode`.
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(Contributed by Joannah Nanjekye and Victor Stinner in :issue:`35537`.)
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@ -1569,7 +1553,7 @@ Changes in the Python API
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* The :meth:`imap.IMAP4.logout` method no longer ignores silently arbitrary
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exceptions.
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* The function :func:`platform.popen` has been removed, it was deprecated since
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* The function :func:`platform.popen` has been removed, after having been deprecated since
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Python 3.3: use :func:`os.popen` instead.
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(Contributed by Victor Stinner in :issue:`35345`.)
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@ -1584,9 +1568,9 @@ Changes in the Python API
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specialized methods like :meth:`~tkinter.ttk.Treeview.selection_set` for
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changing the selection. (Contributed by Serhiy Storchaka in :issue:`31508`.)
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* The :meth:`writexml`, :meth:`toxml` and :meth:`toprettyxml` methods of the
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:mod:`xml.dom.minidom` module, and :mod:`xml.etree` now preserve the attribute
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order specified by the user.
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* The :meth:`writexml`, :meth:`toxml` and :meth:`toprettyxml` methods of
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:mod:`xml.dom.minidom`, and the :meth:`write` method of :mod:`xml.etree`,
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now preserve the attribute order specified by the user.
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(Contributed by Diego Rojas and Raymond Hettinger in :issue:`34160`.)
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* A :mod:`dbm.dumb` database opened with flags ``'r'`` is now read-only.
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@ -1596,7 +1580,7 @@ Changes in the Python API
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* The ``doctype()`` method defined in a subclass of
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:class:`~xml.etree.ElementTree.XMLParser` will no longer be called and will
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cause emitting a :exc:`RuntimeWarning` instead of a :exc:`DeprecationWarning`.
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emit a :exc:`RuntimeWarning` instead of a :exc:`DeprecationWarning`.
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Define the :meth:`doctype() <xml.etree.ElementTree.TreeBuilder.doctype>`
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method on a target for handling an XML doctype declaration.
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(Contributed by Serhiy Storchaka in :issue:`29209`.)
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@ -1639,7 +1623,7 @@ Changes in the Python API
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* The :meth:`mmap.flush() <mmap.mmap.flush>` method now returns ``None`` on
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success and raises an exception on error under all platforms. Previously,
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its behavior was platform-depended: a nonzero value was returned on success;
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its behavior was platform-dependent: a nonzero value was returned on success;
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zero was returned on error under Windows. A zero value was returned on
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success; an exception was raised on error under Unix.
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(Contributed by Berker Peksag in :issue:`2122`.)
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@ -1683,7 +1667,7 @@ Changes in the Python API
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* :class:`types.CodeType` has a new parameter in the second position of the
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constructor (*posonlyargcount*) to support positional-only arguments defined
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in :pep:`570`. The first argument (*argcount*) now represents the total
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number of positional arguments (including positional-only arguments). A new
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number of positional arguments (including positional-only arguments). The new
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``replace()`` method of :class:`types.CodeType` can be used to make the code
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future-proof.
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@ -1691,9 +1675,9 @@ Changes in the Python API
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Changes in the C API
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--------------------
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* The :c:type:`PyCompilerFlags` structure gets a new *cf_feature_version*
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* The :c:type:`PyCompilerFlags` structure got a new *cf_feature_version*
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field. It should be initialized to ``PY_MINOR_VERSION``. The field is ignored
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by default, it is used if and only if ``PyCF_ONLY_AST`` flag is set in
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by default, and is used if and only if ``PyCF_ONLY_AST`` flag is set in
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*cf_flags*.
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* The :c:func:`PyEval_ReInitThreads` function has been removed from the C API.
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