Misc/NEWS.d/3.6.5rc1.rst - platform/external/python/cpython3 - Gitiles

 .. bpo: 33001
 .. date: 2018-03-05-10-09-51
 .. nonce: elj4Aa
 .. release date: 2018-03-13
 .. section: Security

 Minimal fix to prevent buffer overrun in os.symlink on Windows

 ..

 .. bpo: 32981
 .. date: 2018-03-02-10-24-52
 .. nonce: O_qDyj
 .. section: Security

 Regexes in difflib and poplib were vulnerable to catastrophic backtracking.
 These regexes formed potential DOS vectors (REDOS). They have been
 refactored. This resolves CVE-2018-1060 and CVE-2018-1061. Patch by Jamie
 Davis.

 ..

 .. bpo: 33026
 .. date: 2018-03-08-09-48-38
 .. nonce: QZA3Ba
 .. section: Core and Builtins

 Fixed jumping out of "with" block by setting f_lineno.

 ..

 .. bpo: 17288
 .. date: 2018-02-27-13-36-21
 .. nonce: Gdj24S
 .. section: Core and Builtins

 Prevent jumps from 'return' and 'exception' trace events.

 ..

 .. bpo: 32889
 .. date: 2018-02-20-21-53-48
 .. nonce: J6eWy5
 .. section: Core and Builtins

 Update Valgrind suppression list to account for the rename of
 ``Py_ADDRESS_IN_RANG`` to ``address_in_range``.

 ..

 .. bpo: 32650
 .. date: 2018-01-28-23-01-39
 .. nonce: Bbi7ek
 .. section: Core and Builtins

 Pdb and other debuggers dependent on bdb.py will correctly step over (next
 command) native coroutines. Patch by Pablo Galindo.

 ..

 .. bpo: 32685
 .. date: 2018-01-28-12-25-06
 .. nonce: nGctze
 .. section: Core and Builtins

 Improve suggestion when the Python 2 form of print statement is either
 present on the same line as the header of a compound statement or else
 terminated by a semi-colon instead of a newline. Patch by Nitish Chandra.

 ..

 .. bpo: 32583
 .. date: 2018-01-26-21-20-21
 .. nonce: Fh3fau
 .. section: Core and Builtins

 Fix possible crashing in builtin Unicode decoders caused by write
 out-of-bound errors when using customized decode error handlers.

 ..

 .. bpo: 26163
 .. date: 2018-01-14-20-32-47
 .. nonce: xv9Iuv
 .. section: Core and Builtins

 Improved frozenset() hash to create more distinct hash values when faced
 with datasets containing many similar values.

 ..

 .. bpo: 27169
 .. date: 2017-12-15-11-50-06
 .. nonce: VO84fQ
 .. section: Core and Builtins

 The ``__debug__`` constant is now optimized out at compile time. This fixes
 also bpo-22091.

 ..

 .. bpo: 32329
 .. date: 2017-12-15-00-55-35
 .. nonce: XL1O99
 .. section: Core and Builtins

 ``sys.flags.hash_randomization`` is now properly set to 0 when hash
 randomization is turned off by ``PYTHONHASHSEED=0``.

 ..

 .. bpo: 30416
 .. date: 2017-12-14-11-48-19
 .. nonce: hlHo_9
 .. section: Core and Builtins

 The optimizer is now protected from spending much time doing complex
 calculations and consuming much memory for creating large constants in
 constant folding.

 ..

 .. bpo: 18533
 .. date: 2017-12-13-16-46-23
 .. nonce: Dlk8d7
 .. section: Core and Builtins

 ``repr()`` on a dict containing its own ``values()`` or ``items()`` no
 longer raises ``RecursionError``; OrderedDict similarly.  Instead, use
 ``...``, as for other recursive structures.  Patch by Ben North.

 ..

 .. bpo: 32028
 .. date: 2017-12-03-22-29-13
 .. nonce: KC2w4Q
 .. section: Core and Builtins

 Leading whitespace is now correctly ignored when generating suggestions for
 converting Py2 print statements to Py3 builtin print function calls. Patch
 by Sanyam Khurana.

 ..

 .. bpo: 32137
 .. date: 2017-11-26-14-36-30
 .. nonce: Stj5nL
 .. section: Core and Builtins

 The repr of deeply nested dict now raises a RecursionError instead of
 crashing due to a stack overflow.

 ..

 .. bpo: 33064
 .. date: 2018-03-12-19-58-25
 .. nonce: LO2KIY
 .. section: Library

 lib2to3 now properly supports trailing commas after ``*args`` and
 ``**kwargs`` in function signatures.

 ..

 .. bpo: 31804
 .. date: 2018-03-11-19-03-52
 .. nonce: i8KUMp
 .. section: Library

 Avoid failing in multiprocessing.Process if the standard streams are closed
 or None at exit.

 ..

 .. bpo: 33037
 .. date: 2018-03-09-23-07-07
 .. nonce: nAJ3at
 .. section: Library

 Skip sending/receiving data after SSL transport closing.

 ..

 .. bpo: 30353
 .. date: 2018-03-08-09-54-01
 .. nonce: XdE5aM
 .. section: Library

 Fix ctypes pass-by-value for structs on 64-bit Cygwin/MinGW.

 ..

 .. bpo: 33009
 .. date: 2018-03-06-11-54-59
 .. nonce: -Ekysb
 .. section: Library

 Fix inspect.signature() for single-parameter partialmethods.

 ..

 .. bpo: 32969
 .. date: 2018-03-06-00-19-41
 .. nonce: rGTKa0
 .. section: Library

 Expose several missing constants in zlib and fix corresponding
 documentation.

 ..

 .. bpo: 32713
 .. date: 2018-02-26-13-16-36
 .. nonce: 55yegW
 .. section: Library

 Fixed tarfile.itn handling of out-of-bounds float values. Patch by Joffrey
 Fuhrer.

 ..

 .. bpo: 30622
 .. date: 2018-02-24-21-40-42
 .. nonce: dQjxSe
 .. section: Library

 The ssl module now detects missing NPN support in LibreSSL.

 ..

 .. bpo: 32922
 .. date: 2018-02-23-19-12-04
 .. nonce: u-xe0B
 .. section: Library

 dbm.open() now encodes filename with the filesystem encoding rather than
 default encoding.

 ..

 .. bpo: 32859
 .. date: 2018-02-19-17-46-31
 .. nonce: kAT-Xp
 .. section: Library

 In ``os.dup2``, don't check every call whether the ``dup3`` syscall exists
 or not.

 ..

 .. bpo: 21060
 .. date: 2018-02-17-19-20-19
 .. nonce: S1Z-x6
 .. section: Library

 Rewrite confusing message from setup.py upload from "No dist file created in
 earlier command" to the more helpful "Must create and upload files in one
 command".

 ..

 .. bpo: 32857
 .. date: 2018-02-16-14-37-14
 .. nonce: -XljAx
 .. section: Library

 In :mod:`tkinter`, ``after_cancel(None)`` now raises a :exc:`ValueError`
 instead of canceling the first scheduled function.  Patch by Cheryl Sabella.

 ..

 .. bpo: 32852
 .. date: 2018-02-15-12-04-29
 .. nonce: HDqIxM
 .. section: Library

 Make sure sys.argv remains as a list when running trace.

 ..

 .. bpo: 32841
 .. date: 2018-02-14-00-21-24
 .. nonce: bvHDOc
 .. section: Library

 Fixed `asyncio.Condition` issue which silently ignored cancellation after
 notifying and cancelling a conditional lock. Patch by Bar Harel.

 ..

 .. bpo: 31787
 .. date: 2018-02-09-21-41-56
 .. nonce: owSZ2t
 .. section: Library

 Fixed refleaks of ``__init__()`` methods in various modules. (Contributed by
 Oren Milman)

 ..

 .. bpo: 30157
 .. date: 2018-02-09-14-44-43
 .. nonce: lEiiAK
 .. section: Library

 Fixed guessing quote and delimiter in csv.Sniffer.sniff() when only the last
 field is quoted.  Patch by Jake Davis.

 ..

 .. bpo: 32394
 .. date: 2018-02-08-08-18-26
 .. nonce: 6E_7X7
 .. section: Library

 socket: Remove TCP_FASTOPEN, TCP_KEEPCNT flags on older version Windows
 during run-time.

 ..

 .. bpo: 32777
 .. date: 2018-02-05-21-28-28
 .. nonce: C-wIXF
 .. section: Library

 Fix a rare but potential pre-exec child process deadlock in subprocess on
 POSIX systems when marking file descriptors inheritable on exec in the child
 process.  This bug appears to have been introduced in 3.4.

 ..

 .. bpo: 32647
 .. date: 2018-02-05-13-31-42
 .. nonce: ktmfR_
 .. section: Library

 The ctypes module used to depend on indirect linking for dlopen. The shared
 extension is now explicitly linked against libdl on platforms with dl.

 ..

 .. bpo: 32734
 .. date: 2018-02-01-01-34-47
 .. nonce: gCV9AD
 .. section: Library

 Fixed ``asyncio.Lock()`` safety issue which allowed acquiring and locking
 the same lock multiple times, without it being free. Patch by Bar Harel.

 ..

 .. bpo: 32727
 .. date: 2018-01-30-17-46-18
 .. nonce: aHVsRC
 .. section: Library

 Do not include name field in SMTP envelope from address. Patch by Stéphane
 Wirtel

 ..

 .. bpo: 27931
 .. date: 2018-01-25-21-04-11
 .. nonce: e4r52t
 .. section: Library

 Fix email address header parsing error when the username is an empty quoted
 string. Patch by Xiang Zhang.

 ..

 .. bpo: 32304
 .. date: 2018-01-21-16-33-53
 .. nonce: TItrNv
 .. section: Library

 distutils' upload command no longer corrupts tar files ending with a CR
 byte, and no longer tries to convert CR to CRLF in any of the upload text
 fields.

 ..

 .. bpo: 32502
 .. date: 2018-01-20-17-15-34
 .. nonce: OXJfn7
 .. section: Library

 uuid.uuid1 no longer raises an exception if a 64-bit hardware address is
 encountered.

 ..

 .. bpo: 31848
 .. date: 2018-01-18-23-34-17
 .. nonce: M2cldy
 .. section: Library

 Fix the error handling in Aifc_read.initfp() when the SSND chunk is not
 found. Patch by Zackery Spytz.

 ..

 .. bpo: 32555
 .. date: 2018-01-15-17-52-47
 .. nonce: CMq2zF
 .. section: Library

 On FreeBSD and Solaris, os.strerror() now always decode the byte string from
 the current locale encoding, rather than using ASCII/surrogateescape in some
 cases.

 ..

 .. bpo: 32521
 .. date: 2018-01-15-12-53-13
 .. nonce: IxX4Ba
 .. section: Library

 The nis module is now compatible with new libnsl and headers location.

 ..

 .. bpo: 32473
 .. date: 2018-01-10-20-37-59
 .. nonce: mP_yJG
 .. section: Library

 Improve ABCMeta._dump_registry() output readability

 ..

 .. bpo: 32521
 .. date: 2018-01-08-18-02-33
 .. nonce: Kh-KoN
 .. section: Library

 glibc has removed Sun RPC. Use replacement libtirpc headers and library in
 nis module.

 ..

 .. bpo: 32228
 .. date: 2017-12-22-16-47-41
 .. nonce: waPx3q
 .. section: Library

 Ensure that ``truncate()`` preserves the file position (as reported by
 ``tell()``) after writes longer than the buffer size.

 ..

 .. bpo: 26133
 .. date: 2017-12-21-11-08-42
 .. nonce: mt81QV
 .. section: Library

 Don't unsubscribe signals in asyncio UNIX event loop on interpreter
 shutdown.

 ..

 .. bpo: 32185
 .. date: 2017-12-20-09-25-10
 .. nonce: IL0cMt
 .. section: Library

 The SSL module no longer sends IP addresses in SNI TLS extension on
 platforms with OpenSSL 1.0.2+ or inet_pton.

 ..

 .. bpo: 32323
 .. date: 2017-12-14-10-10-10
 .. nonce: ideco
 .. section: Library

 :func:`urllib.parse.urlsplit()` does not convert zone-id (scope) to lower
 case for scoped IPv6 addresses in hostnames now.

 ..

 .. bpo: 32302
 .. date: 2017-12-13-22-38-08
 .. nonce: othtTr
 .. section: Library

 Fix bdist_wininst of distutils for CRT v142: it binary compatible with CRT
 v140.

 ..

 .. bpo: 32255
 .. date: 2017-12-12-07-29-06
 .. nonce: 2bfNmM
 .. section: Library

 A single empty field is now always quoted when written into a CSV file. This
 allows to distinguish an empty row from a row consisting of a single empty
 field. Patch by Licht Takeuchi.

 ..

 .. bpo: 32277
 .. date: 2017-12-11-09-53-14
 .. nonce: jkKiVC
 .. section: Library

 Raise ``NotImplementedError`` instead of ``SystemError`` on platforms where
 ``chmod(..., follow_symlinks=False)`` is not supported.  Patch by Anthony
 Sottile.

 ..

 .. bpo: 32199
 .. date: 2017-12-04-12-23-26
 .. nonce: nGof4v
 .. section: Library

 The getnode() ip getter now uses 'ip link' instead of 'ip link list'.

 ..

 .. bpo: 27456
 .. date: 2017-11-02-11-57-41
 .. nonce: snzyTC
 .. section: Library

 Ensure TCP_NODELAY is set on Linux. Tests by Victor Stinner.

 ..

 .. bpo: 31900
 .. date: 2017-10-30-15-55-32
 .. nonce: -S9xc4
 .. section: Library

 The :func:`locale.localeconv` function now sets temporarily the ``LC_CTYPE``
 locale to the ``LC_NUMERIC`` locale to decode ``decimal_point`` and
 ``thousands_sep`` byte strings if they are non-ASCII or longer than 1 byte,
 and the ``LC_NUMERIC`` locale is different than the ``LC_CTYPE`` locale.
 This temporary change affects other threads.
 Same change for the :meth:`str.format` method when formatting a number
 (:class:`int`, :class:`float`, :class:`float` and subclasses) with the ``n``
 type (ex: ``'{:n}'.format(1234)``).

 ..

 .. bpo: 31802
 .. date: 2017-10-17-14-52-14
 .. nonce: sYj2Zv
 .. section: Library

 Importing native path module (``posixpath``, ``ntpath``) now works even if
 the ``os`` module still is not imported.

 ..

 .. bpo: 17232
 .. date: 2018-02-23-12-48-03
 .. nonce: tmuTKL
 .. section: Documentation

 Clarify docs for -O and -OO.  Patch by Terry Reedy.

 ..

 .. bpo: 32800
 .. date: 2018-02-10-15-16-04
 .. nonce: FyrqCk
 .. section: Documentation

 Update link to w3c doc for xml default namespaces.

 ..

 .. bpo: 8722
 .. date: 2018-02-03-06-11-37
 .. nonce: MPyVyj
 .. section: Documentation

 Document :meth:`__getattr__` behavior when property :meth:`get` method
 raises :exc:`AttributeError`.

 ..

 .. bpo: 32614
 .. date: 2018-02-02-07-41-57
 .. nonce: LSqzGw
 .. section: Documentation

 Modify RE examples in documentation to use raw strings to prevent
 :exc:`DeprecationWarning` and add text to REGEX HOWTO to highlight the
 deprecation.

 ..

 .. bpo: 31972
 .. date: 2018-01-25-14-23-12
 .. nonce: w1m_8r
 .. section: Documentation

 Improve docstrings for `pathlib.PurePath` subclasses.

 ..

 .. bpo: 17799
 .. date: 2018-01-22-21-13-46
 .. nonce: rdZ-Vk
 .. section: Documentation

 Explain real behaviour of sys.settrace and sys.setprofile and their C-API
 counterparts regarding which type of events are received in each function.
 Patch by Pablo Galindo Salgado.

 ..

 .. bpo: 32517
 .. date: 2018-03-09-07-05-12
 .. nonce: ugc1iW
 .. section: Tests

 Fix failing ``test_asyncio`` on macOS 10.12.2+ due to transport of
 ``KqueueSelector`` loop was not being closed.

 ..

 .. bpo: 32721
 .. date: 2018-01-29-21-30-44
 .. nonce: 2Bebm1
 .. section: Tests

 Fix test_hashlib to not fail if the _md5 module is not built.

 ..

 .. bpo: 32252
 .. date: 2017-12-11-13-31-33
 .. nonce: YnFw7J
 .. section: Tests

 Fix faulthandler_suppress_crash_report() used to prevent core dump files
 when testing crashes. getrlimit() returns zero on success.

 ..

 .. bpo: 31518
 .. date: 2017-09-19-20-48-50
 .. nonce: KwTMMz
 .. section: Tests

 Debian Unstable has disabled TLS 1.0 and 1.1 for SSLv23_METHOD(). Change
 TLS/SSL protocol of some tests to PROTOCOL_TLS or PROTOCOL_TLSv1_2 to make
 them pass on Debian.

 ..

 .. bpo: 32635
 .. date: 2018-01-23-15-33-40
 .. nonce: qHwIZy
 .. section: Build

 Fix segfault of the crypt module when libxcrypt is provided instead of
 libcrypt at the system.

 ..

 .. bpo: 33016
 .. date: 2018-03-07-01-33-33
 .. nonce: Z_Med0
 .. section: Windows

 Fix potential use of uninitialized memory in nt._getfinalpathname

 ..

 .. bpo: 32903
 .. date: 2018-02-28-11-03-24
 .. nonce: 1SXY4t
 .. section: Windows

 Fix a memory leak in os.chdir() on Windows if the current directory is set
 to a UNC path.

 ..

 .. bpo: 31966
 .. date: 2018-02-19-13-54-42
 .. nonce: _Q3HPb
 .. section: Windows

 Fixed WindowsConsoleIO.write() for writing empty data.

 ..

 .. bpo: 32409
 .. date: 2018-02-19-10-00-57
 .. nonce: nocuDg
 .. section: Windows

 Ensures activate.bat can handle Unicode contents.

 ..

 .. bpo: 32457
 .. date: 2018-02-19-08-54-06
 .. nonce: vVP0Iz
 .. section: Windows

 Improves handling of denormalized executable path when launching Python.

 ..

 .. bpo: 32370
 .. date: 2018-02-10-15-38-19
 .. nonce: kcKuct
 .. section: Windows

 Use the correct encoding for ipconfig output in the uuid module. Patch by
 Segev Finer.

 ..

 .. bpo: 29248
 .. date: 2018-02-07-17-50-48
 .. nonce: Xzwj-6
 .. section: Windows

 Fix :func:`os.readlink` on Windows, which was mistakenly treating the
 ``PrintNameOffset`` field of the reparse data buffer as a number of
 characters instead of bytes. Patch by Craig Holmquist and SSE4.

 ..

 .. bpo: 32588
 .. date: 2018-01-18-14-56-45
 .. nonce: vHww6F
 .. section: Windows

 Create standalone _distutils_findvs module.

 ..

 .. bpo: 32726
 .. date: 2018-03-13-21-00-20
 .. nonce: Mticyn
 .. section: macOS

 Provide an additional, more modern macOS installer variant that supports
 macOS 10.9+ systems in 64-bit mode only. Upgrade the supplied third-party
 libraries to OpenSSL 1.0.2n, XZ 5.2.3, and SQLite 3.22.0. The 10.9+
 installer now links with and supplies its own copy of Tcl/Tk 8.6.8.

 ..

 .. bpo: 32984
 .. date: 2018-03-05-01-29-05
 .. nonce: NGjgT4
 .. section: IDLE

 Set ``__file__`` while running a startup file.  Like Python, IDLE optionally
 runs one startup file in the Shell window before presenting the first
 interactive input prompt.  For IDLE, ``-s`` runs a file named in
 environmental variable  :envvar:`IDLESTARTUP` or  :envvar:`PYTHONSTARTUP`;
 ``-r file`` runs ``file``.  Python sets ``__file__`` to the startup file
 name before running the file and unsets it before the first prompt.  IDLE
 now does the same when run normally, without the ``-n`` option.

 ..

 .. bpo: 32940
 .. date: 2018-02-24-18-20-50
 .. nonce: ZaJ1Rf
 .. section: IDLE

 Simplify and rename StringTranslatePseudoMapping in pyparse.

 ..

 .. bpo: 32916
 .. date: 2018-02-23-07-32-36
 .. nonce: 4MsQ5F
 .. section: IDLE

 Change ``str`` to ``code`` in pyparse.

 ..

 .. bpo: 32905
 .. date: 2018-02-22-00-09-27
 .. nonce: VlXj0x
 .. section: IDLE

 Remove unused code in pyparse module.

 ..

 .. bpo: 32874
 .. date: 2018-02-19-10-56-41
 .. nonce: 6pZ9Gv
 .. section: IDLE

 Add tests for pyparse.

 ..

 .. bpo: 32837
 .. date: 2018-02-12-17-22-48
 .. nonce: -33QPl
 .. section: IDLE

 Using the system and place-dependent default encoding for open() is a bad
 idea for IDLE's system and location-independent files.

 ..

 .. bpo: 32826
 .. date: 2018-02-12-11-05-22
 .. nonce: IxNZrk
 .. section: IDLE

 Add "encoding=utf-8" to open() in IDLE's test_help_about. GUI test
 test_file_buttons() only looks at initial ascii-only lines, but failed on
 systems where open() defaults to 'ascii' because readline() internally reads
 and decodes far enough ahead to encounter a non-ascii character in
 CREDITS.txt.

 ..

 .. bpo: 32765
 .. date: 2018-02-04-17-52-54
 .. nonce: qm0eCu
 .. section: IDLE

 Update configdialog General tab docstring to add new widgets to the widget
 list.

 ..

 .. bpo: 24960
 .. date: 2017-12-22-09-25-51
 .. nonce: TGdAgO
 .. section: Tools/Demos

 2to3 and lib2to3 can now read pickled grammar files using pkgutil.get_data()
 rather than probing the filesystem. This lets 2to3 and lib2to3 work when run
 from a zipfile.

 ..

 .. bpo: 32222
 .. date: 2017-12-07-20-51-20
 .. nonce: hPBcGT
 .. section: Tools/Demos

 Fix pygettext not extracting docstrings for functions with type annotated
 arguments. Patch by Toby Harradine.

 ..

 .. bpo: 29084
 .. date: 2017-12-16-09-59-35
 .. nonce: ZGJ-LJ
 .. section: C API

 Undocumented C API for OrderedDict has been excluded from the limited C API.
 It was added by mistake and actually never worked in the limited C API.
	.. bpo: 33001
	.. date: 2018-03-05-10-09-51
	.. nonce: elj4Aa
	.. release date: 2018-03-13
	.. section: Security

	Minimal fix to prevent buffer overrun in os.symlink on Windows

	..

	.. bpo: 32981
	.. date: 2018-03-02-10-24-52
	.. nonce: O_qDyj
	.. section: Security

	Regexes in difflib and poplib were vulnerable to catastrophic backtracking.
	These regexes formed potential DOS vectors (REDOS). They have been
	refactored. This resolves CVE-2018-1060 and CVE-2018-1061. Patch by Jamie
	Davis.

	..

	.. bpo: 33026
	.. date: 2018-03-08-09-48-38
	.. nonce: QZA3Ba
	.. section: Core and Builtins

	Fixed jumping out of "with" block by setting f_lineno.

	..

	.. bpo: 17288
	.. date: 2018-02-27-13-36-21
	.. nonce: Gdj24S
	.. section: Core and Builtins

	Prevent jumps from 'return' and 'exception' trace events.

	..

	.. bpo: 32889
	.. date: 2018-02-20-21-53-48
	.. nonce: J6eWy5
	.. section: Core and Builtins

	Update Valgrind suppression list to account for the rename of
	``Py_ADDRESS_IN_RANG`` to ``address_in_range``.

	..

	.. bpo: 32650
	.. date: 2018-01-28-23-01-39
	.. nonce: Bbi7ek
	.. section: Core and Builtins

	Pdb and other debuggers dependent on bdb.py will correctly step over (next
	command) native coroutines. Patch by Pablo Galindo.

	..

	.. bpo: 32685
	.. date: 2018-01-28-12-25-06
	.. nonce: nGctze
	.. section: Core and Builtins

	Improve suggestion when the Python 2 form of print statement is either
	present on the same line as the header of a compound statement or else
	terminated by a semi-colon instead of a newline. Patch by Nitish Chandra.

	..

	.. bpo: 32583
	.. date: 2018-01-26-21-20-21
	.. nonce: Fh3fau
	.. section: Core and Builtins

	Fix possible crashing in builtin Unicode decoders caused by write
	out-of-bound errors when using customized decode error handlers.

	..

	.. bpo: 26163
	.. date: 2018-01-14-20-32-47
	.. nonce: xv9Iuv
	.. section: Core and Builtins

	Improved frozenset() hash to create more distinct hash values when faced
	with datasets containing many similar values.

	..

	.. bpo: 27169
	.. date: 2017-12-15-11-50-06
	.. nonce: VO84fQ
	.. section: Core and Builtins

	The ``__debug__`` constant is now optimized out at compile time. This fixes
	also bpo-22091.

	..

	.. bpo: 32329
	.. date: 2017-12-15-00-55-35
	.. nonce: XL1O99
	.. section: Core and Builtins

	``sys.flags.hash_randomization`` is now properly set to 0 when hash
	randomization is turned off by ``PYTHONHASHSEED=0``.

	..

	.. bpo: 30416
	.. date: 2017-12-14-11-48-19
	.. nonce: hlHo_9
	.. section: Core and Builtins

	The optimizer is now protected from spending much time doing complex
	calculations and consuming much memory for creating large constants in
	constant folding.

	..

	.. bpo: 18533
	.. date: 2017-12-13-16-46-23
	.. nonce: Dlk8d7
	.. section: Core and Builtins

	``repr()`` on a dict containing its own ``values()`` or ``items()`` no
	longer raises ``RecursionError``; OrderedDict similarly. Instead, use
	``...``, as for other recursive structures. Patch by Ben North.

	..

	.. bpo: 32028
	.. date: 2017-12-03-22-29-13
	.. nonce: KC2w4Q
	.. section: Core and Builtins

	Leading whitespace is now correctly ignored when generating suggestions for
	converting Py2 print statements to Py3 builtin print function calls. Patch
	by Sanyam Khurana.

	..

	.. bpo: 32137
	.. date: 2017-11-26-14-36-30
	.. nonce: Stj5nL
	.. section: Core and Builtins

	The repr of deeply nested dict now raises a RecursionError instead of
	crashing due to a stack overflow.

	..

	.. bpo: 33064
	.. date: 2018-03-12-19-58-25
	.. nonce: LO2KIY
	.. section: Library

	lib2to3 now properly supports trailing commas after ``*args`` and
	``**kwargs`` in function signatures.

	..

	.. bpo: 31804
	.. date: 2018-03-11-19-03-52
	.. nonce: i8KUMp
	.. section: Library

	Avoid failing in multiprocessing.Process if the standard streams are closed
	or None at exit.

	..

	.. bpo: 33037
	.. date: 2018-03-09-23-07-07
	.. nonce: nAJ3at
	.. section: Library

	Skip sending/receiving data after SSL transport closing.

	..

	.. bpo: 30353
	.. date: 2018-03-08-09-54-01
	.. nonce: XdE5aM
	.. section: Library

	Fix ctypes pass-by-value for structs on 64-bit Cygwin/MinGW.

	..

	.. bpo: 33009
	.. date: 2018-03-06-11-54-59
	.. nonce: -Ekysb
	.. section: Library

	Fix inspect.signature() for single-parameter partialmethods.

	..

	.. bpo: 32969
	.. date: 2018-03-06-00-19-41
	.. nonce: rGTKa0
	.. section: Library

	Expose several missing constants in zlib and fix corresponding
	documentation.

	..

	.. bpo: 32713
	.. date: 2018-02-26-13-16-36
	.. nonce: 55yegW
	.. section: Library

	Fixed tarfile.itn handling of out-of-bounds float values. Patch by Joffrey
	Fuhrer.

	..

	.. bpo: 30622
	.. date: 2018-02-24-21-40-42
	.. nonce: dQjxSe
	.. section: Library

	The ssl module now detects missing NPN support in LibreSSL.

	..

	.. bpo: 32922
	.. date: 2018-02-23-19-12-04
	.. nonce: u-xe0B
	.. section: Library

	dbm.open() now encodes filename with the filesystem encoding rather than
	default encoding.

	..

	.. bpo: 32859
	.. date: 2018-02-19-17-46-31
	.. nonce: kAT-Xp
	.. section: Library

	In ``os.dup2``, don't check every call whether the ``dup3`` syscall exists
	or not.

	..

	.. bpo: 21060
	.. date: 2018-02-17-19-20-19
	.. nonce: S1Z-x6
	.. section: Library

	Rewrite confusing message from setup.py upload from "No dist file created in
	earlier command" to the more helpful "Must create and upload files in one
	command".

	..

	.. bpo: 32857
	.. date: 2018-02-16-14-37-14
	.. nonce: -XljAx
	.. section: Library

	In :mod:`tkinter`, ``after_cancel(None)`` now raises a :exc:`ValueError`
	instead of canceling the first scheduled function. Patch by Cheryl Sabella.

	..

	.. bpo: 32852
	.. date: 2018-02-15-12-04-29
	.. nonce: HDqIxM
	.. section: Library

	Make sure sys.argv remains as a list when running trace.

	..

	.. bpo: 32841
	.. date: 2018-02-14-00-21-24
	.. nonce: bvHDOc
	.. section: Library

	Fixed `asyncio.Condition` issue which silently ignored cancellation after
	notifying and cancelling a conditional lock. Patch by Bar Harel.

	..

	.. bpo: 31787
	.. date: 2018-02-09-21-41-56
	.. nonce: owSZ2t
	.. section: Library

	Fixed refleaks of ``__init__()`` methods in various modules. (Contributed by
	Oren Milman)

	..

	.. bpo: 30157
	.. date: 2018-02-09-14-44-43
	.. nonce: lEiiAK
	.. section: Library

	Fixed guessing quote and delimiter in csv.Sniffer.sniff() when only the last
	field is quoted. Patch by Jake Davis.

	..

	.. bpo: 32394
	.. date: 2018-02-08-08-18-26
	.. nonce: 6E_7X7
	.. section: Library

	socket: Remove TCP_FASTOPEN, TCP_KEEPCNT flags on older version Windows
	during run-time.

	..

	.. bpo: 32777
	.. date: 2018-02-05-21-28-28
	.. nonce: C-wIXF
	.. section: Library

	Fix a rare but potential pre-exec child process deadlock in subprocess on
	POSIX systems when marking file descriptors inheritable on exec in the child
	process. This bug appears to have been introduced in 3.4.

	..

	.. bpo: 32647
	.. date: 2018-02-05-13-31-42
	.. nonce: ktmfR_
	.. section: Library

	The ctypes module used to depend on indirect linking for dlopen. The shared
	extension is now explicitly linked against libdl on platforms with dl.

	..

	.. bpo: 32734
	.. date: 2018-02-01-01-34-47
	.. nonce: gCV9AD
	.. section: Library

	Fixed ``asyncio.Lock()`` safety issue which allowed acquiring and locking
	the same lock multiple times, without it being free. Patch by Bar Harel.

	..

	.. bpo: 32727
	.. date: 2018-01-30-17-46-18
	.. nonce: aHVsRC
	.. section: Library

	Do not include name field in SMTP envelope from address. Patch by Stéphane
	Wirtel

	..

	.. bpo: 27931
	.. date: 2018-01-25-21-04-11
	.. nonce: e4r52t
	.. section: Library

	Fix email address header parsing error when the username is an empty quoted
	string. Patch by Xiang Zhang.

	..

	.. bpo: 32304
	.. date: 2018-01-21-16-33-53
	.. nonce: TItrNv
	.. section: Library

	distutils' upload command no longer corrupts tar files ending with a CR
	byte, and no longer tries to convert CR to CRLF in any of the upload text
	fields.

	..

	.. bpo: 32502
	.. date: 2018-01-20-17-15-34
	.. nonce: OXJfn7
	.. section: Library

	uuid.uuid1 no longer raises an exception if a 64-bit hardware address is
	encountered.

	..

	.. bpo: 31848
	.. date: 2018-01-18-23-34-17
	.. nonce: M2cldy
	.. section: Library

	Fix the error handling in Aifc_read.initfp() when the SSND chunk is not
	found. Patch by Zackery Spytz.

	..

	.. bpo: 32555
	.. date: 2018-01-15-17-52-47
	.. nonce: CMq2zF
	.. section: Library

	On FreeBSD and Solaris, os.strerror() now always decode the byte string from
	the current locale encoding, rather than using ASCII/surrogateescape in some
	cases.

	..

	.. bpo: 32521
	.. date: 2018-01-15-12-53-13
	.. nonce: IxX4Ba
	.. section: Library

	The nis module is now compatible with new libnsl and headers location.

	..

	.. bpo: 32473
	.. date: 2018-01-10-20-37-59
	.. nonce: mP_yJG
	.. section: Library

	Improve ABCMeta._dump_registry() output readability

	..

	.. bpo: 32521
	.. date: 2018-01-08-18-02-33
	.. nonce: Kh-KoN
	.. section: Library

	glibc has removed Sun RPC. Use replacement libtirpc headers and library in
	nis module.

	..

	.. bpo: 32228
	.. date: 2017-12-22-16-47-41
	.. nonce: waPx3q
	.. section: Library

	Ensure that ``truncate()`` preserves the file position (as reported by
	``tell()``) after writes longer than the buffer size.

	..

	.. bpo: 26133
	.. date: 2017-12-21-11-08-42
	.. nonce: mt81QV
	.. section: Library

	Don't unsubscribe signals in asyncio UNIX event loop on interpreter
	shutdown.

	..

	.. bpo: 32185
	.. date: 2017-12-20-09-25-10
	.. nonce: IL0cMt
	.. section: Library

	The SSL module no longer sends IP addresses in SNI TLS extension on
	platforms with OpenSSL 1.0.2+ or inet_pton.

	..

	.. bpo: 32323
	.. date: 2017-12-14-10-10-10
	.. nonce: ideco
	.. section: Library

	:func:`urllib.parse.urlsplit()` does not convert zone-id (scope) to lower
	case for scoped IPv6 addresses in hostnames now.

	..

	.. bpo: 32302
	.. date: 2017-12-13-22-38-08
	.. nonce: othtTr
	.. section: Library

	Fix bdist_wininst of distutils for CRT v142: it binary compatible with CRT
	v140.

	..

	.. bpo: 32255
	.. date: 2017-12-12-07-29-06
	.. nonce: 2bfNmM
	.. section: Library

	A single empty field is now always quoted when written into a CSV file. This
	allows to distinguish an empty row from a row consisting of a single empty
	field. Patch by Licht Takeuchi.

	..

	.. bpo: 32277
	.. date: 2017-12-11-09-53-14
	.. nonce: jkKiVC
	.. section: Library

	Raise ``NotImplementedError`` instead of ``SystemError`` on platforms where
	``chmod(..., follow_symlinks=False)`` is not supported. Patch by Anthony
	Sottile.

	..

	.. bpo: 32199
	.. date: 2017-12-04-12-23-26
	.. nonce: nGof4v
	.. section: Library

	The getnode() ip getter now uses 'ip link' instead of 'ip link list'.

	..

	.. bpo: 27456
	.. date: 2017-11-02-11-57-41
	.. nonce: snzyTC
	.. section: Library

	Ensure TCP_NODELAY is set on Linux. Tests by Victor Stinner.

	..

	.. bpo: 31900
	.. date: 2017-10-30-15-55-32
	.. nonce: -S9xc4
	.. section: Library

	The :func:`locale.localeconv` function now sets temporarily the ``LC_CTYPE``
	locale to the ``LC_NUMERIC`` locale to decode ``decimal_point`` and
	``thousands_sep`` byte strings if they are non-ASCII or longer than 1 byte,
	and the ``LC_NUMERIC`` locale is different than the ``LC_CTYPE`` locale.
	This temporary change affects other threads.
	Same change for the :meth:`str.format` method when formatting a number
	(:class:`int`, :class:`float`, :class:`float` and subclasses) with the ``n``
	type (ex: ``'{:n}'.format(1234)``).

	..

	.. bpo: 31802
	.. date: 2017-10-17-14-52-14
	.. nonce: sYj2Zv
	.. section: Library

	Importing native path module (``posixpath``, ``ntpath``) now works even if
	the ``os`` module still is not imported.

	..

	.. bpo: 17232
	.. date: 2018-02-23-12-48-03
	.. nonce: tmuTKL
	.. section: Documentation

	Clarify docs for -O and -OO. Patch by Terry Reedy.

	..

	.. bpo: 32800
	.. date: 2018-02-10-15-16-04
	.. nonce: FyrqCk
	.. section: Documentation

	Update link to w3c doc for xml default namespaces.

	..

	.. bpo: 8722
	.. date: 2018-02-03-06-11-37
	.. nonce: MPyVyj
	.. section: Documentation

	Document :meth:`__getattr__` behavior when property :meth:`get` method
	raises :exc:`AttributeError`.

	..

	.. bpo: 32614
	.. date: 2018-02-02-07-41-57
	.. nonce: LSqzGw
	.. section: Documentation

	Modify RE examples in documentation to use raw strings to prevent
	:exc:`DeprecationWarning` and add text to REGEX HOWTO to highlight the
	deprecation.

	..

	.. bpo: 31972
	.. date: 2018-01-25-14-23-12
	.. nonce: w1m_8r
	.. section: Documentation

	Improve docstrings for `pathlib.PurePath` subclasses.

	..

	.. bpo: 17799
	.. date: 2018-01-22-21-13-46
	.. nonce: rdZ-Vk
	.. section: Documentation

	Explain real behaviour of sys.settrace and sys.setprofile and their C-API
	counterparts regarding which type of events are received in each function.
	Patch by Pablo Galindo Salgado.

	..

	.. bpo: 32517
	.. date: 2018-03-09-07-05-12
	.. nonce: ugc1iW
	.. section: Tests

	Fix failing ``test_asyncio`` on macOS 10.12.2+ due to transport of
	``KqueueSelector`` loop was not being closed.

	..

	.. bpo: 32721
	.. date: 2018-01-29-21-30-44
	.. nonce: 2Bebm1
	.. section: Tests

	Fix test_hashlib to not fail if the _md5 module is not built.

	..

	.. bpo: 32252
	.. date: 2017-12-11-13-31-33
	.. nonce: YnFw7J
	.. section: Tests

	Fix faulthandler_suppress_crash_report() used to prevent core dump files
	when testing crashes. getrlimit() returns zero on success.

	..

	.. bpo: 31518
	.. date: 2017-09-19-20-48-50
	.. nonce: KwTMMz
	.. section: Tests

	Debian Unstable has disabled TLS 1.0 and 1.1 for SSLv23_METHOD(). Change
	TLS/SSL protocol of some tests to PROTOCOL_TLS or PROTOCOL_TLSv1_2 to make
	them pass on Debian.

	..

	.. bpo: 32635
	.. date: 2018-01-23-15-33-40
	.. nonce: qHwIZy
	.. section: Build

	Fix segfault of the crypt module when libxcrypt is provided instead of
	libcrypt at the system.

	..

	.. bpo: 33016
	.. date: 2018-03-07-01-33-33
	.. nonce: Z_Med0
	.. section: Windows

	Fix potential use of uninitialized memory in nt._getfinalpathname

	..

	.. bpo: 32903
	.. date: 2018-02-28-11-03-24
	.. nonce: 1SXY4t
	.. section: Windows

	Fix a memory leak in os.chdir() on Windows if the current directory is set
	to a UNC path.

	..

	.. bpo: 31966
	.. date: 2018-02-19-13-54-42
	.. nonce: _Q3HPb
	.. section: Windows

	Fixed WindowsConsoleIO.write() for writing empty data.

	..

	.. bpo: 32409
	.. date: 2018-02-19-10-00-57
	.. nonce: nocuDg
	.. section: Windows

	Ensures activate.bat can handle Unicode contents.

	..

	.. bpo: 32457
	.. date: 2018-02-19-08-54-06
	.. nonce: vVP0Iz
	.. section: Windows

	Improves handling of denormalized executable path when launching Python.

	..

	.. bpo: 32370
	.. date: 2018-02-10-15-38-19
	.. nonce: kcKuct
	.. section: Windows

	Use the correct encoding for ipconfig output in the uuid module. Patch by
	Segev Finer.

	..

	.. bpo: 29248
	.. date: 2018-02-07-17-50-48
	.. nonce: Xzwj-6
	.. section: Windows

	Fix :func:`os.readlink` on Windows, which was mistakenly treating the
	``PrintNameOffset`` field of the reparse data buffer as a number of
	characters instead of bytes. Patch by Craig Holmquist and SSE4.

	..

	.. bpo: 32588
	.. date: 2018-01-18-14-56-45
	.. nonce: vHww6F
	.. section: Windows

	Create standalone _distutils_findvs module.

	..

	.. bpo: 32726
	.. date: 2018-03-13-21-00-20
	.. nonce: Mticyn
	.. section: macOS

	Provide an additional, more modern macOS installer variant that supports
	macOS 10.9+ systems in 64-bit mode only. Upgrade the supplied third-party
	libraries to OpenSSL 1.0.2n, XZ 5.2.3, and SQLite 3.22.0. The 10.9+
	installer now links with and supplies its own copy of Tcl/Tk 8.6.8.

	..

	.. bpo: 32984
	.. date: 2018-03-05-01-29-05
	.. nonce: NGjgT4
	.. section: IDLE

	Set ``__file__`` while running a startup file. Like Python, IDLE optionally
	runs one startup file in the Shell window before presenting the first
	interactive input prompt. For IDLE, ``-s`` runs a file named in
	environmental variable :envvar:`IDLESTARTUP` or :envvar:`PYTHONSTARTUP`;
	``-r file`` runs ``file``. Python sets ``__file__`` to the startup file
	name before running the file and unsets it before the first prompt. IDLE
	now does the same when run normally, without the ``-n`` option.

	..

	.. bpo: 32940
	.. date: 2018-02-24-18-20-50
	.. nonce: ZaJ1Rf
	.. section: IDLE

	Simplify and rename StringTranslatePseudoMapping in pyparse.

	..

	.. bpo: 32916
	.. date: 2018-02-23-07-32-36
	.. nonce: 4MsQ5F
	.. section: IDLE

	Change ``str`` to ``code`` in pyparse.

	..

	.. bpo: 32905
	.. date: 2018-02-22-00-09-27
	.. nonce: VlXj0x
	.. section: IDLE

	Remove unused code in pyparse module.

	..

	.. bpo: 32874
	.. date: 2018-02-19-10-56-41
	.. nonce: 6pZ9Gv
	.. section: IDLE

	Add tests for pyparse.

	..

	.. bpo: 32837
	.. date: 2018-02-12-17-22-48
	.. nonce: -33QPl
	.. section: IDLE

	Using the system and place-dependent default encoding for open() is a bad
	idea for IDLE's system and location-independent files.

	..

	.. bpo: 32826
	.. date: 2018-02-12-11-05-22
	.. nonce: IxNZrk
	.. section: IDLE

	Add "encoding=utf-8" to open() in IDLE's test_help_about. GUI test
	test_file_buttons() only looks at initial ascii-only lines, but failed on
	systems where open() defaults to 'ascii' because readline() internally reads
	and decodes far enough ahead to encounter a non-ascii character in
	CREDITS.txt.

	..

	.. bpo: 32765
	.. date: 2018-02-04-17-52-54
	.. nonce: qm0eCu
	.. section: IDLE

	Update configdialog General tab docstring to add new widgets to the widget
	list.

	..

	.. bpo: 24960
	.. date: 2017-12-22-09-25-51
	.. nonce: TGdAgO
	.. section: Tools/Demos

	2to3 and lib2to3 can now read pickled grammar files using pkgutil.get_data()
	rather than probing the filesystem. This lets 2to3 and lib2to3 work when run
	from a zipfile.

	..

	.. bpo: 32222
	.. date: 2017-12-07-20-51-20
	.. nonce: hPBcGT
	.. section: Tools/Demos

	Fix pygettext not extracting docstrings for functions with type annotated
	arguments. Patch by Toby Harradine.

	..

	.. bpo: 29084
	.. date: 2017-12-16-09-59-35
	.. nonce: ZGJ-LJ
	.. section: C API

	Undocumented C API for OrderedDict has been excluded from the limited C API.
	It was added by mistake and actually never worked in the limited C API.