* Builtin and extension modules are now initialized in a multi-phase process,
which is similar to how Python modules are loaded. (:pep:`489`).
-Significantly Improved Library Modules:
+Significantly improved library modules:
* :class:`collections.OrderedDict` is now implemented in C, which makes it
4 to 100 times faster. (Contributed by Eric Snow in :issue:`16991`.)
:pep:`475` adds support for automatic retry of system calls failing with
:py:data:`~errno.EINTR`: this means that user code doesn't have to deal with
-EINTR or :exc:`InterruptedError` manually, and should make it more robust
+``EINTR`` or :exc:`InterruptedError` manually, and should make it more robust
against asynchronous signal reception.
Examples of functions which are now retried when interrupted by a signal
protocol. (Contributed by Berker Peksag in :issue:`20289`.)
+csv
+---
+
+:meth:`Writer.writerow <csv.Writer.writerow>` now supports arbitrary iterables,
+not just sequences. (Contributed by Serhiy Storchaka in :issue:`23171`.)
+
+
cmath
-----
collections.abc
---------------
+The :meth:`Sequence.index <collections.abc.Sequence.index>` method now
+accepts *start* and *stop* arguments to match the corresponding methods
+of :class:`tuple`, :class:`list`, etc.
+(Contributed by Devin Jeanpierre in :issue:`23086`.)
+
A new :class:`~collections.abc.Generator` abstract base class. (Contributed
by Stefan Behnel in :issue:`24018`.)
-New :class:`~collections.abc.Coroutine`,
+New :class:`~collections.abc.Awaitable` :class:`~collections.abc.Coroutine`,
:class:`~collections.abc.AsyncIterator`, and
:class:`~collections.abc.AsyncIterable` abstract base classes.
(Contributed by Yury Selivanov in :issue:`24184`.)
The :func:`~compileall.compile_dir` function has a corresponding ``workers``
parameter. (Contributed by Claudiu Popa in :issue:`16104`.)
+Another new option, ``-r``, allows to control the maximum recursion
+level for subdirectories. (Contributed by Claudiu Popa in :issue:`19628`.)
+
The ``-q`` command line option can now be specified more than once, in
which case all output, including errors, will be suppressed. The corresponding
``quiet`` parameter in :func:`~compileall.compile_dir`,
:meth:`~concurrent.futures.ProcessPoolExecutor` is used.
(Contributed by Dan O'Reilly in :issue:`11271`.)
+A number of workers in :class:`~concurrent.futures.ThreadPoolExecutor` is
+optional now. The default value equals to 5 times the number of CPUs.
+(Contributed by Claudiu Popa in :issue:`21527`.)
+
+
+configparser
+------------
+
+Config parsers can be customized by providing a dictionary of converters in the
+constructor. All converters defined in config parser (either by subclassing or
+by providing in a constructor) will be available on all section proxies.
+(Contributed by Łukasz Langa in :issue:`18159`.)
+
contextlib
----------
manual screen resize. (Contributed by Arnon Yaari in :issue:`4254`.)
+dbm
+---
+
+:func:`dumb.open <dbm.dumb.open>` always creates a new database when the flag
+has the value ``'n'``. (Contributed by Claudiu Popa in :issue:`18039`.)
+
+
difflib
-------
``SMTPUTF8`` extension. (Contributed by R. David Murray in
:issue:`24211`.)
+:class:`email.mime.text.MIMEText` constructor now accepts a
+:class:`~email.charset.Charset` instance.
+(Contributed by Claude Paroz and Berker Peksag in :issue:`16324`.)
+
enum
----
(Contributed by Serhiy Storchaka in :issue:`13968`.)
+gzip
+----
+
+The *mode* argument of :class:`~gzip.GzipFile` constructor now
+accepts ``"x"`` to request exclusive creation.
+(Contributed by Tim Heaney in :issue:`19222`.)
+
+
heapq
-----
Element comparison in :func:`~heapq.merge` can now be customized by
-passing a :term:`key function` in a new optional ``key`` keyword argument.
-A new optional ``reverse`` keyword argument can be used to reverse element
+passing a :term:`key function` in a new optional *key* keyword argument.
+A new optional *reverse* keyword argument can be used to reverse element
comparison. (Contributed by Raymond Hettinger in :issue:`13742`.)
(Contributed by Demian Brecht in :issue:`21793`.)
+http.client
+-----------
+
+:meth:`HTTPConnection.getresponse() <http.client.HTTPConnection.getresponse>`
+now raises a :exc:`~http.client.RemoteDisconnected` exception when a
+remote server connection is closed unexpectedly. Additionally, if a
+:exc:`ConnectionError` (of which ``RemoteDisconnected``
+is a subclass) is raised, the client socket is now closed automatically,
+and will reconnect on the next request.
+(Contributed by Martin Panter in :issue:`3566`.)
+
+
idlelib and IDLE
----------------
in :issue:`21650`.)
JSON decoder now raises :exc:`json.JSONDecodeError` instead of
-:exc:`ValueError`. (Contributed by Serhiy Storchaka in :issue:`19361`.)
+:exc:`ValueError` to provide better context information about the error.
+(Contributed by Serhiy Storchaka in :issue:`19361`.)
+
+
+linecache
+---------
+
+A new :func:`~linecache.lazycache` function can be used to capture information
+about a non-file based module to permit getting its lines later via
+:func:`~linecache.getline`. This avoids doing I/O until a line is actually
+needed, without having to carry the module globals around indefinitely.
+(Contributed by Robert Collins in :issue:`17911`.)
locale
Storchaka in :issue:`22486`.)
+multiprocessing
+---------------
+
+:func:`~multiprocessing.synchronized` objects now support the
+:term:`context manager` protocol. (Contributed by Charles-François Natali in
+:issue:`21565`.)
+
+
operator
--------
re
--
+References and conditional references to groups with fixed length are now
+allowed in lookbehind assertions.
+(Contributed by Serhiy Storchaka in :issue:`9179`.)
+
The number of capturing groups in regular expression is no longer limited by
100. (Contributed by Serhiy Storchaka in :issue:`22437`.)
hook that will be called whenever a :term:`coroutine object <coroutine>`
is created by an :keyword:`async def` function. A corresponding
:func:`~sys.get_coroutine_wrapper` can be used to obtain a currently set
-wrapper. Both functions are provisional, and are intended for debugging
-purposes only. (Contributed by Yury Selivanov in :issue:`24017`.)
+wrapper. Both functions are :term:`provisional <provisional package>`,
+and are intended for debugging purposes only. (Contributed by Yury Selivanov
+in :issue:`24017`.)
A new :func:`~sys.is_finalizing` function can be used to check if the Python
interpreter is :term:`shutting down <interpreter shutdown>`.
they will be owned by the named user and group in the tarfile.
(Contributed by Michael Vogt and Eric Smith in :issue:`23193`.)
+The :meth:`TarFile.list <tarfile.TarFile.list>` now accepts an optional
+*members* keyword argument that can be set to a subset of the list returned
+by :meth:`TarFile.getmembers <tarfile.TarFile.getmembers>`.
+(Contributed by Serhiy Storchaka in :issue:`21549`.)
+
threading
---------
unittest
--------
+The :meth:`TestLoader.loadTestsFromModule <unittest.TestLoader.loadTestsFromModule>`
+method now accepts a keyword-only argument *pattern* which is passed to
+``load_tests`` as the third argument. Found packages are now checked for
+``load_tests`` regardless of whether their path matches *pattern*, because it
+is impossible for a package name to match the default pattern.
+(Contributed by Robert Collins and Barry A. Warsaw in :issue:`16662`.)
+
+Unittest discovery errors now are exposed in
+:data:`TestLoader.errors <unittest.TestLoader.errors>` attribute of the
+:class:`~unittest.TestLoader` instance.
+(Contributed by Robert Collins in :issue:`19746`.)
+
A new command line option ``--locals`` to show local variables in
tracebacks. (Contributed by Robert Collins in :issue:`22936`.)
(Contributed by Johannes Baiter in :issue:`20968`, and Håkan Lövdahl
in :issue:`23581` and :issue:`23568`.)
+It is no longer necessary to explicitly pass ``create=True`` to the
+:func:`~unittest.mock.patch` function when patching builtin names.
+(Contributed by Kushal Das in :issue:`17660`.)
+
wsgiref
-------
:class:`xmlreader.InputSource <xml.sax.xmlreader.InputSource>` object.
(Contributed by Serhiy Storchaka in :issue:`2175`.)
+:func:`~xml.sax.parseString` now accepts a :class:`str` instance.
+(Contributed by Serhiy Storchaka in :issue:`10590`.)
+
zipfile
-------
Passing a format string as keyword argument *format_string* to the
:meth:`~string.Formatter.format` method of the :class:`string.Formatter`
class has been deprecated.
+(Contributed by Serhiy Storchaka in :issue:`23671`.)
The :func:`platform.dist` and :func:`platform.linux_distribution` functions
are now deprecated and will be removed in Python 3.7. Linux distributions use
Use of ``re.LOCALE`` flag with str patterns or ``re.ASCII`` is now
deprecated. (Contributed by Serhiy Storchaka in :issue:`22407`.)
+Use of unrecognized special sequences consisting of ``'\'`` and an ASCII letter
+in regular expression patterns and replacement patterns now raises a
+deprecation warning and will be forbidden in Python 3.6.
+(Contributed by Serhiy Storchaka in :issue:`23622`.)
+
+The undocumented and unofficial *use_load_tests* default argument of the
+:meth:`unittest.TestLoader.loadTestsFromModule` method now is
+deprecated and ignored.
+(Contributed by Robert Collins and Barry A. Warsaw in :issue:`16662`.)
+
Removed
=======
* The concept of ``.pyo`` files has been removed.
-* The JoinableQueue class in the provisional asyncio module was deprecated
- in 3.4.4 and is now removed.
+* The JoinableQueue class in the provisional :mod:`asyncio` module was
+ deprecated in 3.4.4 and is now removed.
(Contributed by A. Jesse Jiryu Davis in :issue:`23464`.)
an empty string. For compatibility use patterns that never match an empty
string (e.g. ``"x+"`` instead of ``"x*"``). Patterns that could only match
an empty string (such as ``"\b"``) now raise an error.
+ (Contributed by Serhiy Storchaka in :issue:`22818`.)
* The :class:`~http.cookies.Morsel` dict-like interface has been made self
consistent: morsel comparison now takes the :attr:`~http.cookies.Morsel.key`
projects / python / commitdiff