diff options
Diffstat (limited to 'Doc/whatsnew')
| -rw-r--r-- | Doc/whatsnew/2.1.rst | 2 | ||||
| -rw-r--r-- | Doc/whatsnew/3.3.rst | 6 | ||||
| -rw-r--r-- | Doc/whatsnew/3.5.rst | 817 | ||||
| -rw-r--r-- | Doc/whatsnew/index.rst | 1 |
4 files changed, 822 insertions, 4 deletions
diff --git a/Doc/whatsnew/2.1.rst b/Doc/whatsnew/2.1.rst index 5058bf1d5a..ff1566226d 100644 --- a/Doc/whatsnew/2.1.rst +++ b/Doc/whatsnew/2.1.rst @@ -219,7 +219,7 @@ comparison. I won't cover the C API here, but will refer you to PEP 207, or to .. seealso:: - :pep:`207` - Rich Comparisions + :pep:`207` - Rich Comparisons Written by Guido van Rossum, heavily based on earlier work by David Ascher, and implemented by Guido van Rossum. diff --git a/Doc/whatsnew/3.3.rst b/Doc/whatsnew/3.3.rst index 1fdb365847..1d4ce7236f 100644 --- a/Doc/whatsnew/3.3.rst +++ b/Doc/whatsnew/3.3.rst @@ -1579,7 +1579,7 @@ os avoid race conditions in multi-threaded programs. * The :mod:`os` module has a new :func:`~os.sendfile` function which provides - an efficent "zero-copy" way for copying data from one file (or socket) + an efficient "zero-copy" way for copying data from one file (or socket) descriptor to another. The phrase "zero-copy" refers to the fact that all of the copying of data between the two descriptors is done entirely by the kernel, with no copying of data into userspace buffers. :func:`~os.sendfile` @@ -1908,7 +1908,7 @@ socketserver :meth:`~socketserver.BaseServer.service_actions` that is called by the :meth:`~socketserver.BaseServer.serve_forever` method in the service loop. :class:`~socketserver.ForkingMixIn` now uses this to clean up zombie -child proceses. (Contributed by Justin Warkentin in :issue:`11109`.) +child processes. (Contributed by Justin Warkentin in :issue:`11109`.) sqlite3 @@ -2360,7 +2360,7 @@ Porting Python code bytecode file, make sure to call :func:`importlib.invalidate_caches` to clear out the cache for the finders to notice the new file. -* :exc:`ImportError` now uses the full name of the module that was attemped to +* :exc:`ImportError` now uses the full name of the module that was attempted to be imported. Doctests that check ImportErrors' message will need to be updated to use the full name of the module instead of just the tail of the name. diff --git a/Doc/whatsnew/3.5.rst b/Doc/whatsnew/3.5.rst new file mode 100644 index 0000000000..a1130df3c8 --- /dev/null +++ b/Doc/whatsnew/3.5.rst @@ -0,0 +1,817 @@ +**************************** + What's New In Python 3.5 +**************************** + +: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 3.5, compared to 3.4. + +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 3.5 moves towards release, + so it's worth checking back even after reading earlier versions. + + +.. seealso:: + + :pep:`478` - Python 3.5 Release Schedule + + +Summary -- Release highlights +============================= + +.. This section singles out the most important changes in Python 3.5. + Brevity is key. + +New syntax features: + +* :pep:`465`, a new matrix multiplication operator: ``a @ b``. + +New library modules: + +* :mod:`zipapp`: :ref:`Improving Python ZIP Application Support + <whatsnew-zipapp>` (:pep:`441`). + +New built-in features: + +* ``bytes % args``, ``bytearray % args``: :pep:`461` - Adding ``%`` formatting + to bytes and bytearray + +Implementation improvements: + +* When the ``LC_TYPE`` locale is the POSIX locale (``C`` locale), + :py:data:`sys.stdin` and :py:data:`sys.stdout` are now using the + ``surrogateescape`` error handler, instead of the ``strict`` error handler + (:issue:`19977`). + +* :pep:`488`, the elimination of ``.pyo`` files. + +Significantly Improved Library Modules: + +* None yet. + +Security improvements: + +* None yet. + +Please read on for a comprehensive list of user-facing changes. + + +.. 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 + + +PEP 461 - Adding % formatting to bytes and bytearray +---------------------------------------------------- + +This PEP proposes adding % formatting operations similar to Python 2's ``str`` +type to :class:`bytes` and :class:`bytearray`. + +Examples:: + + >>> b'Hello %s!' % b'World' + b'Hello World!' + >>> b'x=%i y=%f' % (1, 2.5) + b'x=1 y=2.500000' + +Unicode is not allowed for ``%s``, but it is accepted by ``%a`` (equivalent of +``repr(obj).encode('ascii', 'backslashreplace')``):: + + >>> b'Hello %s!' % 'World' + Traceback (most recent call last): + File "<stdin>", line 1, in <module> + TypeError: %b requires bytes, or an object that implements __bytes__, not 'str' + >>> b'price: %a' % '10€' + b"price: '10\\u20ac'" + +.. seealso:: + + :pep:`461` -- Adding % formatting to bytes and bytearray + + +PEP 465 - A dedicated infix operator for matrix multiplication +-------------------------------------------------------------- + +This PEP proposes a new binary operator to be used for matrix multiplication, +called ``@``. (Mnemonic: ``@`` is ``*`` for mATrices.) + +.. seealso:: + + :pep:`465` -- A dedicated infix operator for matrix multiplication + + +PEP 471 - os.scandir() function -- a better and faster directory iterator +------------------------------------------------------------------------- + +:pep:`471` adds a new directory iteration function, :func:`os.scandir`, +to the standard library. Additionally, :func:`os.walk` is now +implemented using :func:`os.scandir`, which speeds it up by 3-5 times +on POSIX systems and by 7-20 times on Windows systems. + +PEP and implementation written by Ben Hoyt with the help of Victor Stinner. + +.. seealso:: + + :pep:`471` -- os.scandir() function -- a better and faster directory + iterator + + +PEP 475: Retry system calls failing with EINTR +---------------------------------------------- + +: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 +against asynchronous signal reception. + +.. seealso:: + + :pep:`475` -- Retry system calls failing with EINTR + + +PEP 486: Make the Python Launcher aware of virtual environments +--------------------------------------------------------------- + +:pep:`486` makes the Windows launcher (see :pep:`397`) aware of an active +virtual environment. When the default interpreter would be used and the +``VIRTUAL_ENV`` environment variable is set, the interpreter in the virtual +environment will be used. + +.. seealso:: + + :pep:`486` -- Make the Python Launcher aware of virtual environments + + +PEP 488: Elimination of PYO files +--------------------------------- + +:pep:`488` does away with the concept of ``.pyo`` files. This means that +``.pyc`` files represent both unoptimized and optimized bytecode. To prevent +the need to constantly regenerate bytecode files, ``.pyc`` files now have an +optional ``opt-`` tag in their name when the bytecode is optimized. This has +the side-effect of no more bytecode file name clashes when running under either +``-O`` or ``-OO``, thus allowing unoptimized, ``-O``, and ``-OO`` bytecode files +to all exist simultaneously. :func:`importlib.util.cache_from_source` has an +updated API to help with this change. + +.. seealso:: + + :pep:`488` -- Elimination of PYO files + + +Other Language Changes +====================== + +Some smaller changes made to the core Python language are: + +* Added the ``'namereplace'`` error handlers. The ``'backslashreplace'`` + error handlers now works with decoding and translating. + (Contributed by Serhiy Storchaka in :issue:`19676` and :issue:`22286`.) + +* The :option:`-b` option now affects comparisons of :class:`bytes` with + :class:`int`. (Contributed by Serhiy Storchaka in :issue:`23681`) + + +New Modules +=========== + +.. _whatsnew-zipapp: + +zipapp +------ + +The new :mod:`zipapp` module (specified in :pep:`441`) provides an API and +command line tool for creating executable Python Zip Applications, which +were introduced in Python 2.6 in :issue:`1739468` but which were not well +publicised, either at the time or since. + +With the new module, bundling your application is as simple as putting all +the files, including a ``__main__.py`` file, into a directory ``myapp`` +and running:: + + $ python -m zipapp myapp + $ python myapp.pyz + + +Improved Modules +================ + +argparse +-------- + +* :class:`~argparse.ArgumentParser` now allows to disable + :ref:`abbreviated usage <prefix-matching>` of long options by setting + :ref:`allow_abbrev` to ``False``. + (Contributed by Jonathan Paugh, Steven Bethard, paul j3 and Daniel Eriksson.) + +cgi +--- + +* :class:`~cgi.FieldStorage` now supports the context management protocol. + (Contributed by Berker Peksag in :issue:`20289`.) + +code +---- + +* The :func:`code.InteractiveInterpreter.showtraceback` method now prints + the full chained traceback, just like the interactive interpreter. + (Contributed by Claudiu Popa in :issue:`17442`.) + +compileall +---------- + +* :func:`compileall.compile_dir` and :mod:`compileall`'s command-line interface + can now do parallel bytecode compilation. + (Contributed by Claudiu Popa in :issue:`16104`.) + +contextlib +---------- + +* The new :func:`contextlib.redirect_stderr` context manager(similar to + :func:`contextlib.redirect_stdout`) makes it easier for utility scripts to + handle inflexible APIs that write their output to :data:`sys.stderr` and + don't provide any options to redirect it. + (Contributed by Berker Peksag in :issue:`22389`.) + +difflib +------- + +* The charset of the HTML document generated by :meth:`difflib.HtmlDiff.make_file` + can now be customized by using *charset* keyword-only parameter. The default + charset of HTML document changed from ``'ISO-8859-1'`` to ``'utf-8'``. + (Contributed by Berker Peksag in :issue:`2052`.) + +distutils +--------- + +* The ``build`` and ``build_ext`` commands now accept a ``-j`` + option to enable parallel building of extension modules. + (Contributed by Antoine Pitrou in :issue:`5309`.) + +doctest +------- + +* :func:`doctest.DocTestSuite` returns an empty :class:`unittest.TestSuite` if + *module* contains no docstrings instead of raising :exc:`ValueError`. + (Contributed by Glenn Jones in :issue:`15916`.) + +glob +---- + +* :func:`~glob.iglob` and :func:`~glob.glob` now support recursive search in + subdirectories using the "``**``" pattern. + (Contributed by Serhiy Storchaka in :issue:`13968`.) + +imaplib +------- + +* :class:`IMAP4` now supports the context management protocol. When used in a + :keyword:`with` statement, the IMAP4 ``LOGOUT`` command will be called + automatically at the end of the block. (Contributed by Tarek Ziadé and + Serhiy Storchaka in :issue:`4972`.) + +imghdr +------ + +* :func:`~imghdr.what` now recognizes the `OpenEXR <http://www.openexr.com>`_ + format. (Contributed by Martin Vignali and Claudiu Popa in :issue:`20295`.) + +importlib +--------- + +* :class:`importlib.util.LazyLoader` allows for the lazy loading of modules in + applications where startup time is paramount. + (Contributed by Brett Cannon in :issue:`17621`.) + +* :func:`importlib.abc.InspectLoader.source_to_code` is now a + static method to make it easier to work with source code in a string. + With a module object that you want to initialize you can then use + ``exec(code, module.__dict__)`` to execute the code in the module. + +* :func:`importlib.util.module_from_spec` is now the preferred way to create a + new module. Compared to :class:`types.ModuleType`, this new function will set + the various import-controlled attributes based on the passed-in spec object. + +inspect +------- + +* :class:`inspect.Signature` and :class:`inspect.Parameter` are now + picklable and hashable. (Contributed by Yury Selivanov in :issue:`20726` + and :issue:`20334`.) + +* New class method :meth:`inspect.Signature.from_callable`, which makes + subclassing of :class:`~inspect.Signature` easier. (Contributed + by Yury Selivanov and Eric Snow in :issue:`17373`.) + +ipaddress +--------- + +* :class:`ipaddress.IPv4Network` and :class:`ipaddress.IPv6Network` now + accept an ``(address, netmask)`` tuple argument, so as to easily construct + network objects from existing addresses. (Contributed by Peter Moody + and Antoine Pitrou in :issue:`16531`.) + +json +---- + +* The output of :mod:`json.tool` command line interface is now in the same + order as the input. Use the :option:`--sort-keys` option to sort the output + of dictionaries alphabetically by key. (Contributed by Berker Peksag in + :issue:`21650`.) + +* JSON decoder now raises :exc:`json.JSONDecodeError` instead of + :exc:`ValueError`. (Contributed by Serhiy Storchaka in :issue:`19361`.) + +os +-- + +* New :func:`os.scandir` function that exposes file information from + the operating system when listing a directory. :func:`os.scandir` + returns an iterator of :class:`os.DirEntry` objects corresponding to + the entries in the directory given by *path*. (Contributed by Ben + Hoyt with the help of Victor Stinner in :issue:`22524`.) + +* :class:`os.stat_result` now has a :attr:`~os.stat_result.st_file_attributes` + attribute on Windows. (Contributed by Ben Hoyt in :issue:`21719`.) + +os.path +------- + +* New :func:`~os.path.commonpath` function that extracts common path prefix. + Unlike the :func:`~os.path.commonprefix` function, it always returns a valid + patch. (Contributed by Rafik Draoui and Serhiy Storchaka in :issue:`10395`.) + +pickle +------ + +* Serializing more "lookupable" objects (such as unbound methods or nested + classes) now are supported with pickle protocols < 4. + (Contributed by Serhiy Storchaka in :issue:`23611`.) + +re +-- + +* Number of capturing groups in regular expression is no longer limited by 100. + (Contributed by Serhiy Storchaka in :issue:`22437`.) + +* Now unmatched groups are replaced with empty strings in :func:`re.sub` + and :func:`re.subn`. (Contributed by Serhiy Storchaka in :issue:`1519638`.) + +math +---- + +* :data:`math.inf` and :data:`math.nan` constants added. (Contributed by Mark + Dickinson in :issue:`23185`.) + +shutil +------ + +* :func:`~shutil.move` now accepts a *copy_function* argument, allowing, + for example, :func:`~shutil.copy` to be used instead of the default + :func:`~shutil.copy2` if there is a need to ignore metadata. (Contributed by + Claudiu Popa in :issue:`19840`.) + +signal +------ + +* On Windows, :func:`signal.set_wakeup_fd` now also supports socket handles. + (Contributed by Victor Stinner in :issue:`22018`.) + +* Different constants of :mod:`signal` module are now enumeration values using + the :mod:`enum` module. This allows meaningful names to be printed during + debugging, instead of integer “magic numbers”. (Contributed by Giampaolo + Rodola' in :issue:`21076`.) + +smtpd +----- + +* Both :class:`~smtpd.SMTPServer` and :class:`smtpd.SMTPChannel` now accept a + *decode_data* keyword to determine if the DATA portion of the SMTP + transaction is decoded using the ``utf-8`` codec or is instead provided to + :meth:`~smtpd.SMTPServer.process_message` as a byte string. The default + is ``True`` for backward compatibility reasons, but will change to ``False`` + in Python 3.6. (Contributed by Maciej Szulik in :issue:`19662`.) + +* It is now possible to provide, directly or via name resolution, IPv6 + addresses in the :class:`~smtpd.SMTPServer` constructor, and have it + successfully connect. (Contributed by Milan Oberkirch in :issue:`14758`.) + +* :mod:`~smtpd.SMTPServer` now supports :rfc:`6531` via the *enable_SMTPUTF8* + constructor argument and a user-provided + :meth:`~smtpd.SMTPServer.process_smtputf8_message` method. + +smtplib +------- + +* A new :meth:`~smtplib.SMTP.auth` method provides a convenient way to + implement custom authentication mechanisms. + (Contributed by Milan Oberkirch in :issue:`15014`.) + +sndhdr +------ + +* :func:`~sndhdr.what` and :func:`~sndhdr.whathdr` now return + :func:`~collections.namedtuple`. + (Contributed by Claudiu Popa in :issue:`18615`.) + +socket +------ + +* New :meth:`socket.socket.sendfile` method allows to send a file over a socket + by using high-performance :func:`os.sendfile` function on UNIX resulting in + uploads being from 2x to 3x faster than when using plain + :meth:`socket.socket.send`. + (Contributed by Giampaolo Rodola' in :issue:`17552`.) + +sysconfig +--------- + +* The user scripts directory on Windows is now versioned. + (Contributed by Paul Moore in :issue:`23437`.) + + +tarfile +------- + +* The :func:`tarfile.open` function now supports ``'x'`` (exclusive creation) + mode. (Contributed by Berker Peksag in :issue:`21717`.) + +time +---- + +* The :func:`time.monotonic` function is now always available. (Contributed by + Victor Stinner in :issue:`22043`.) + +urllib +------ + +* A new :class:`urllib.request.HTTPBasicPriorAuthHandler` allows HTTP Basic + Authentication credentials to be sent unconditionally with the first HTTP + request, rather than waiting for a HTTP 401 Unauthorized response from the + server. + (Contributed by Matej Cepl in :issue:`19494`.) + +wsgiref +------- + +* *headers* parameter of :class:`wsgiref.headers.Headers` is now optional. + (Contributed by Pablo Torres Navarrete and SilentGhost in :issue:`5800`.) + +xmlrpc +------ + +* :class:`xmlrpc.client.ServerProxy` is now a :term:`context manager`. + (Contributed by Claudiu Popa in :issue:`20627`.) + +xml.sax +------- + +* SAX parsers now support a character stream of + :class:`~xml.sax.xmlreader.InputSource` object. + (Contributed by Serhiy Storchaka in :issue:`2175`.) + +faulthandler +------------ + +* :func:`~faulthandler.enable`, :func:`~faulthandler.register`, + :func:`~faulthandler.dump_traceback` and + :func:`~faulthandler.dump_traceback_later` functions now accept file + descriptors. (Contributed by Wei Wu in :issue:`23566`.) + +zipfile +------- + +* Added support for writing ZIP files to unseekable streams. + (Contributed by Serhiy Storchaka in :issue:`23252`.) + +* The :func:`zipfile.ZipFile.open` function now supports ``'x'`` (exclusive + creation) mode. (Contributed by Serhiy Storchaka in :issue:`21717`.) + + +Optimizations +============= + +The following performance enhancements have been added: + +* :func:`os.walk` has been sped up by 3-5x on POSIX systems and 7-20x + on Windows. This was done using the new :func:`os.scandir` function, + which exposes file information from the underlying ``readdir`` and + ``FindFirstFile``/``FindNextFile`` system calls. (Contributed by + Ben Hoyt with help from Victor Stinner in :issue:`23605`.) + +* Construction of ``bytes(int)`` (filled by zero bytes) is faster and uses less + memory for large objects. ``calloc()`` is used instead of ``malloc()`` to + allocate memory for these objects. + +* Some operations on :class:`~ipaddress.IPv4Network` and + :class:`~ipaddress.IPv6Network` have been massively sped up, such as + :meth:`~ipaddress.IPv4Network.subnets`, :meth:`~ipaddress.IPv4Network.supernet`, + :func:`~ipaddress.summarize_address_range`, :func:`~ipaddress.collapse_addresses`. + The speed up can range from 3x to 15x. + (:issue:`21486`, :issue:`21487`, :issue:`20826`) + +* Many operations on :class:`io.BytesIO` are now 50% to 100% faster. + (Contributed by Serhiy Storchaka in :issue:`15381` and David Wilson in + :issue:`22003`.) + +* :func:`marshal.dumps` is now faster (65%-85% with versions 3--4, 20-25% with + versions 0--2 on typical data, and up to 5x in best cases). + (Contributed by Serhiy Storchaka in :issue:`20416` and :issue:`23344`.) + + +Build and C API Changes +======================= + +Changes to Python's build process and to the C API include: + +* New ``calloc`` functions: + + * :c:func:`PyMem_RawCalloc` + * :c:func:`PyMem_Calloc` + * :c:func:`PyObject_Calloc` + * :c:func:`_PyObject_GC_Calloc` + + +Deprecated +========== + +Unsupported Operating Systems +----------------------------- + +* Windows XP - Per :PEP:`11`, Microsoft support of Windows XP has ended. + + +Deprecated Python modules, functions and methods +------------------------------------------------ + +* The :mod:`formatter` module has now graduated to full deprecation and is still + slated for removal in Python 3.6. + +* :mod:`smtpd` has in the past always decoded the DATA portion of email + messages using the ``utf-8`` codec. This can now be controlled by the new + *decode_data* keyword to :class:`~smtpd.SMTPServer`. The default value is + ``True``, but this default is deprecated. Specify the *decode_data* keyword + with an appropriate value to avoid the deprecation warning. + +* Directly assigning values to the :attr:`~http.cookies.Morsel.key`, + :attr:`~http.cookies.Morsel.value` and + :attr:`~http.cookies.Morsel.coded_value` of :class:`~http.cookies.Morsel` + objects is deprecated. Use the :func:`~http.cookies.Morsel.set` method + instead. In addition, the undocumented *LegalChars* parameter of + :func:`~http.cookies.Morsel.set` is deprecated, and is now ignored. + +* 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. + + +Deprecated functions and types of the C API +------------------------------------------- + +* None yet. + + +Deprecated features +------------------- + +* None yet. + + +Removed +======= + +API and Feature Removals +------------------------ + +The following obsolete and previously deprecated APIs and features have been +removed: + +* The ``__version__`` attribute has been dropped from the email package. The + email code hasn't been shipped separately from the stdlib for a long time, + and the ``__version__`` string was not updated in the last few releases. + +* The internal ``Netrc`` class in the :mod:`ftplib` module was deprecated in + 3.4, and has now been removed. + (Contributed by Matt Chaput in :issue:`6623`.) + +* 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 (:issue:`23464`). + + +Porting to Python 3.5 +===================== + +This section lists previously described changes and other bugfixes +that may require changes to your code. + +Changes in the Python API +------------------------- + +* :pep:`475`: Examples of functions which are now retried when interrupted + instead of raising :exc:`InterruptedError` if the signal handler does not + raise an exception: + + - :func:`open`, :func:`os.open`, :func:`io.open` + - functions of the :mod:`faulthandler` module + - :mod:`os` functions: + + * :func:`os.fchdir` + * :func:`os.fchmod` + * :func:`os.fchown` + * :func:`os.fdatasync` + * :func:`os.fstat` + * :func:`os.fstatvfs` + * :func:`os.fsync` + * :func:`os.ftruncate` + * :func:`os.mkfifo` + * :func:`os.mknod` + * :func:`os.posix_fadvise` + * :func:`os.posix_fallocate` + * :func:`os.pread` + * :func:`os.pwrite` + * :func:`os.read` + * :func:`os.readv` + * :func:`os.sendfile` + * :func:`os.wait3` + * :func:`os.wait4` + * :func:`os.wait` + * :func:`os.waitid` + * :func:`os.waitpid` + * :func:`os.write` + * :func:`os.writev` + * special cases: :func:`os.close` and :func:`os.dup2` now ignore + :py:data:`~errno.EINTR` error, the syscall is not retried (see the PEP + for the rationale) + + - :func:`select.select`, :func:`select.poll.poll`, :func:`select.epoll.poll`, + :func:`select.kqueue.control`, :func:`select.devpoll.poll` + - :func:`socket.socket` methods: + + * :meth:`~socket.socket.accept` + * :meth:`~socket.socket.connect` (except for non-blocking sockets) + * :meth:`~socket.socket.recv` + * :meth:`~socket.socket.recvfrom` + * :meth:`~socket.socket.recvmsg` + * :meth:`~socket.socket.send` + * :meth:`~socket.socket.sendall` + * :meth:`~socket.socket.sendmsg` + * :meth:`~socket.socket.sendto` + + - :func:`signal.sigtimedwait`, :func:`signal.sigwaitinfo` + - :func:`time.sleep` + +* Before Python 3.5, a :class:`datetime.time` object was considered to be false + if it represented midnight in UTC. This behavior was considered obscure and + error-prone and has been removed in Python 3.5. See :issue:`13936` for full + details. + +* :meth:`ssl.SSLSocket.send()` now raises either :exc:`ssl.SSLWantReadError` + or :exc:`ssl.SSLWantWriteError` on a non-blocking socket if the operation + would block. Previously, it would return 0. See :issue:`20951`. + +* The ``__name__`` attribute of generator is now set from the function name, + instead of being set from the code name. Use ``gen.gi_code.co_name`` to + retrieve the code name. Generators also have a new ``__qualname__`` + attribute, the qualified name, which is now used for the representation + of a generator (``repr(gen)``). See :issue:`21205`. + +* The deprecated "strict" mode and argument of :class:`~html.parser.HTMLParser`, + :meth:`HTMLParser.error`, and the :exc:`HTMLParserError` exception have been + removed. (Contributed by Ezio Melotti in :issue:`15114`.) + The *convert_charrefs* argument of :class:`~html.parser.HTMLParser` is + now ``True`` by default. (Contributed by Berker Peksag in :issue:`21047`.) + +* Although it is not formally part of the API, it is worth noting for porting + purposes (ie: fixing tests) that error messages that were previously of the + form "'sometype' does not support the buffer protocol" are now of the form "a + bytes-like object is required, not 'sometype'". (Contributed by Ezio Melotti + in :issue:`16518`.) + +* If the current directory is set to a directory that no longer exists then + :exc:`FileNotFoundError` will no longer be raised and instead + :meth:`~importlib.machinery.FileFinder.find_spec` will return ``None`` + **without** caching ``None`` in :data:`sys.path_importer_cache` which is + different than the typical case (:issue:`22834`). + +* HTTP status code and messages from :mod:`http.client` and :mod:`http.server` + were refactored into a common :class:`~http.HTTPStatus` enum. The values in + :mod:`http.client` and :mod:`http.server` remain available for backwards + compatibility. (Contributed by Demian Brecht in :issue:`21793`.) + +* When an import loader defines :meth:`~importlib.machinery.Loader.exec_module` + it is now expected to also define + :meth:`~importlib.machinery.Loader.create_module` (raises a + :exc:`DeprecationWarning` now, will be an error in Python 3.6). If the loader + inherits from :class:`importlib.abc.Loader` then there is nothing to do, else + simply define :meth:`~importlib.machinery.Loader.create_module` to return + ``None`` (:issue:`23014`). + +* :func:`re.split` always ignored empty pattern matches, so the ``'x*'`` + pattern worked the same as ``'x+'``, and the ``'\b'`` pattern never worked. + Now :func:`re.split` raises a warning if the pattern could match + 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. + +* The :class:`~http.cookies.Morsel` dict-like interface has been made self + consistent: morsel comparison now takes the :attr:`~http.cookies.Morsel.key` + and :attr:`~http.cookies.Morsel.value` into account, + :meth:`~http.cookies.Morsel.copy` now results in a + :class:`~http.cookies.Morsel` instance rather than a :class:`dict`, and + :meth:`~http.cookies.Morsel.update` will now raise an exception if any of the + keys in the update dictionary are invalid. In addition, the undocumented + *LegalChars* parameter of :func:`~http.cookies.Morsel.set` is deprecated and + is now ignored. (:issue:`2211`) + +* :pep:`488` has removed ``.pyo`` files from Python and introduced the optional + ``opt-`` tag in ``.pyc`` file names. The + :func:`importlib.util.cache_from_source` has gained an *optimization* + parameter to help control the ``opt-`` tag. Because of this, the + *debug_override* parameter of the function is now deprecated. `.pyo` files + are also no longer supported as a file argument to the Python interpreter and + thus serve no purpose when distributed on their own (i.e. sourcless code + distribution). Due to the fact that the magic number for bytecode has changed + in Python 3.5, all old `.pyo` files from previous versions of Python are + invalid regardless of this PEP. + + * The :mod:`socket` module now exports the CAN_RAW_FD_FRAMES constant on linux + 3.6 and greater. + +Changes in the C API +-------------------- + +* The undocumented :c:member:`~PyMemoryViewObject.format` member of the + (non-public) :c:type:`PyMemoryViewObject` structure has been removed. + + All extensions relying on the relevant parts in ``memoryobject.h`` + must be rebuilt. + +* The :c:type:`PyMemAllocator` structure was renamed to + :c:type:`PyMemAllocatorEx` and a new ``calloc`` field was added. + +* Removed non-documented macro :c:macro:`PyObject_REPR` which leaked references. + Use format character ``%R`` in :c:func:`PyUnicode_FromFormat`-like functions + to format the :func:`repr` of the object. + +* Because the lack of the :attr:`__module__` attribute breaks pickling and + introspection, a deprecation warning now is raised for builtin type without + the :attr:`__module__` attribute. Would be an AttributeError in future. + (:issue:`20204`) diff --git a/Doc/whatsnew/index.rst b/Doc/whatsnew/index.rst index 29902e407c..edb55022bd 100644 --- a/Doc/whatsnew/index.rst +++ b/Doc/whatsnew/index.rst @@ -11,6 +11,7 @@ anyone wishing to stay up-to-date after a new release. .. toctree:: :maxdepth: 2 + 3.5.rst 3.4.rst 3.3.rst 3.2.rst |