+++++++++++

Python News

+++++++++++

What's New in Python 3.5.4 release candidate 1?

===============================================

Release date: XXXX-XX-XX

Core and Builtins

-----------------

- bpo-28876: ``bool(range)`` works even if ``len(range)``

raises :exc:`OverflowError`.

- bpo-29600: Fix wrapping coroutine return values in StopIteration.

- Issue #29537: Restore runtime compatibility with bytecode files generated by

CPython 3.5.0 to 3.5.2, and adjust the eval loop to avoid the problems that

could be caused by the malformed variant of the BUILD_MAP_UNPACK_WITH_CALL

opcode that they may contain. Patch by Petr Viktorin, Serhiy Storchaka,

and Nick Coghlan.

- Issue #28598: Support __rmod__ for subclasses of str being called before

str.__mod__. Patch by Martijn Pieters.

- bpo-29602: Fix incorrect handling of signed zeros in complex constructor for

complex subclasses and for inputs having a __complex__ method. Patch

by Serhiy Storchaka.

- bpo-29347: Fixed possibly dereferencing undefined pointers

when creating weakref objects.

- bpo-29438: Fixed use-after-free problem in key sharing dict.

- Issue #29319: Prevent RunMainFromImporter overwriting sys.path[0].

- Issue #29337: Fixed possible BytesWarning when compare the code objects.

Warnings could be emitted at compile time.

Extension Modules

-----------------

- Issue #29169: Update zlib to 1.2.11.

Library

-------

- bpo-25803: Avoid incorrect errors raised by Path.mkdir(exist_ok=True)

when the OS gives priority to errors such as EACCES over EEXIST.

- bpo-29861: Release references to tasks, their arguments and their results

as soon as they are finished in multiprocessing.Pool.

- bpo-29884: faulthandler: Restore the old sigaltstack during teardown.

Patch by Christophe Zeitouny.

- bpo-25455: Fixed crashes in repr of recursive buffered file-like objects.

- bpo-29800: Fix crashes in partial.__repr__ if the keys of partial.keywords

are not strings. Patch by Michael Seifert.

- bpo-29742: get_extra_info() raises exception if get called on closed ssl transport.

Patch by Nikolay Kim.

- bpo-8256: Fixed possible failing or crashing input() if attributes "encoding"

or "errors" of sys.stdin or sys.stdout are not set or are not strings.

- bpo-28298: Fix a bug that prevented array 'Q', 'L' and 'I' from accepting big

intables (objects that have __int__) as elements. Patch by Oren Milman.

- bpo-29615: SimpleXMLRPCDispatcher no longer chains KeyError (or any other

exception) to exception(s) raised in the dispatched methods.

Patch by Petr Motejlek.

- bpo-29704: asyncio.subprocess.SubprocessStreamProtocol no longer closes before

all pipes are closed.

- bpo-29703: Fix asyncio to support instantiation of new event loops

in child processes.

- bpo-29376: Fix assertion error in threading._DummyThread.is_alive().

- bpo-29110: Fix file object leak in aifc.open() when file is given as a

filesystem path and is not in valid AIFF format. Patch by Anthony Zhang.

- Issue #28961: Fix unittest.mock._Call helper: don't ignore the name parameter

anymore. Patch written by Jiajun Huang.

- bpo-29532: Altering a kwarg dictionary passed to functools.partial()

no longer affects a partial object after creation.

- Issue #28556: Various updates to typing module: typing.Counter, typing.ChainMap,

improved ABC caching, etc. Original PRs by Jelle Zijlstra, Ivan Levkivskyi,

Manuel Krebber, and Łukasz Langa.

- Issue #29100: Fix datetime.fromtimestamp() regression introduced in Python

3.6.0: check minimum and maximum years.

- Issue #29519: Fix weakref spewing exceptions during interpreter shutdown

when used with a rare combination of multiprocessing and custom codecs.

- Issue #29416: Prevent infinite loop in pathlib.Path.mkdir

- Issue #29444: Fixed out-of-bounds buffer access in the group() method of

the match object. Based on patch by WGH.

- Issue #29335: Fix subprocess.Popen.wait() when the child process has

exited to a stopped instead of terminated state (ex: when under ptrace).

- Issue #29290: Fix a regression in argparse that help messages would wrap at

non-breaking spaces.

- Issue #28735: Fixed the comparison of mock.MagickMock with mock.ANY.

- Issue #29011: Fix an important omission by adding Deque to the typing module.

- Issue #29219: Fixed infinite recursion in the repr of uninitialized

ctypes.CDLL instances.

- Issue #28969: Fixed race condition in C implementation of functools.lru_cache.

KeyError could be raised when cached function with full cache was

simultaneously called from differen threads with the same uncached arguments.

- Issue #29142: In urllib.request, suffixes in no_proxy environment variable with

leading dots could match related hostnames again (e.g. .b.c matches a.b.c).

Patch by Milan Oberkirch.

Windows

-------

- Issue #29392: Prevent crash when passing invalid arguments into msvcrt module.

C API

-----

- Issue #27867: Function PySlice_GetIndicesEx() is replaced with a macro if

Py_LIMITED_API is not set or set to the value between 0x03050400

and 0x03060000 (not including) or 0x03060100 or higher.

- Issue #29083: Fixed the declaration of some public API functions.

PyArg_VaParse() and PyArg_VaParseTupleAndKeywords() were not available in

limited API. PyArg_ValidateKeywordArguments(), PyArg_UnpackTuple() and

Py_BuildValue() were not available in limited API of version < 3.3 when

PY_SSIZE_T_CLEAN is defined.

Documentation

-------------

- bpo-28929: Link the documentation to its source file on GitHub.

- bpo-25008: Document smtpd.py as effectively deprecated and add a pointer to

aiosmtpd, a third-party asyncio-based replacement.

- Issue #26355: Add canonical header link on each page to corresponding major

version of the documentation. Patch by Matthias Bussonnier.

- Issue #29349: Fix Python 2 syntax in code for building the documentation.

Build

-----

- bpo-29643: Fix ``--enable-optimization`` didn't work.

Tests

-----

- Issue #29571: to match the behaviour of the ``re.LOCALE`` flag,

test_re.test_locale_flag now uses ``locale.getpreferredencoding(False)`` to

determine the candidate encoding for the test regex (allowing it to correctly

skip the test when the default locale encoding is a multi-byte encoding)

What's New in Python 3.5.3?

===========================

Release date: 2017-01-17

There were no code changes between 3.5.3rc1 and 3.5.3 final.

What's New in Python 3.5.3 release candidate 1?

===============================================

Release date: 2017-01-02

Core and Builtins

-----------------

- Issue #29073: bytearray formatting no longer truncates on first null byte.

- Issue #28932: Do not include <sys/random.h> if it does not exist.

- Issue #28147: Fix a memory leak in split-table dictionaries: setattr()

must not convert combined table into split table.

- Issue #25677: Correct the positioning of the syntax error caret for

indented blocks. Based on patch by Michael Layzell.

- Issue #29000: Fixed bytes formatting of octals with zero padding in alternate

form.

- Issue #28512: Fixed setting the offset attribute of SyntaxError by

PyErr_SyntaxLocationEx() and PyErr_SyntaxLocationObject().

- Issue #28991: functools.lru_cache() was susceptible to an obscure reentrancy

bug caused by a monkey-patched len() function.

- Issue #28648: Fixed crash in Py_DecodeLocale() in debug build on Mac OS X

when decode astral characters. Patch by Xiang Zhang.

- Issue #19398: Extra slash no longer added to sys.path components in case of

empty compile-time PYTHONPATH components.

- Issue #28426: Fixed potential crash in PyUnicode_AsDecodedObject() in debug

build.

- Issue #23782: Fixed possible memory leak in _PyTraceback_Add() and exception

loss in PyTraceBack_Here().

- Issue #28379: Added sanity checks and tests for PyUnicode_CopyCharacters().

Patch by Xiang Zhang.

- Issue #28376: The type of long range iterator is now registered as Iterator.

Patch by Oren Milman.

- Issue #28376: The constructor of range_iterator now checks that step is not 0.

Patch by Oren Milman.

- Issue #26906: Resolving special methods of uninitialized type now causes

implicit initialization of the type instead of a fail.

- Issue #18287: PyType_Ready() now checks that tp_name is not NULL.

Original patch by Niklas Koep.

- Issue #24098: Fixed possible crash when AST is changed in process of

compiling it.

- Issue #28350: String constants with null character no longer interned.

- Issue #26617: Fix crash when GC runs during weakref callbacks.

- Issue #27942: String constants now interned recursively in tuples and frozensets.

- Issue #21578: Fixed misleading error message when ImportError called with

invalid keyword args.

- Issue #28203: Fix incorrect type in error message from

``complex(1.0, {2:3})``. Patch by Soumya Sharma.

- Issue #27955: Fallback on reading /dev/urandom device when the getrandom()

syscall fails with EPERM, for example when blocked by SECCOMP.

- Issue #28131: Fix a regression in zipimport's compile_source(). zipimport

should use the same optimization level as the interpreter.

- Issue #25221: Fix corrupted result from PyLong_FromLong(0) when

Python is compiled with NSMALLPOSINTS = 0.

- Issue #25758: Prevents zipimport from unnecessarily encoding a filename

(patch by Eryk Sun)

- Issue #28189: dictitems_contains no longer swallows compare errors.

(Patch by Xiang Zhang)

- Issue #27812: Properly clear out a generator's frame's backreference to the

generator to prevent crashes in frame.clear().

- Issue #27811: Fix a crash when a coroutine that has not been awaited is

finalized with warnings-as-errors enabled.

- Issue #27587: Fix another issue found by PVS-Studio: Null pointer check

after use of 'def' in _PyState_AddModule().

Initial patch by Christian Heimes.

- Issue #26020: set literal evaluation order did not match documented behaviour.

- Issue #27782: Multi-phase extension module import now correctly allows the

``m_methods`` field to be used to add module level functions to instances

of non-module types returned from ``Py_create_mod``. Patch by Xiang Zhang.

- Issue #27936: The round() function accepted a second None argument

for some types but not for others. Fixed the inconsistency by

accepting None for all numeric types.

- Issue #27487: Warn if a submodule argument to "python -m" or

runpy.run_module() is found in sys.modules after parent packages are

imported, but before the submodule is executed.

- Issue #27558: Fix a SystemError in the implementation of "raise" statement.

In a brand new thread, raise a RuntimeError since there is no active

exception to reraise. Patch written by Xiang Zhang.

- Issue #27419: Standard __import__() no longer look up "__import__" in globals

or builtins for importing submodules or "from import". Fixed handling an

error of non-string package name.

- Issue #27083: Respect the PYTHONCASEOK environment variable under Windows.

- Issue #27514: Make having too many statically nested blocks a SyntaxError

instead of SystemError.

- Issue #27473: Fixed possible integer overflow in bytes and bytearray

concatenations. Patch by Xiang Zhang.

- Issue #27507: Add integer overflow check in bytearray.extend(). Patch by

Xiang Zhang.

- Issue #27581: Don't rely on wrapping for overflow check in

PySequence_Tuple(). Patch by Xiang Zhang.

- Issue #27443: __length_hint__() of bytearray iterators no longer return a

negative integer for a resized bytearray.

- Issue #27942: Fix memory leak in codeobject.c

Library

-------

- Issue #15812: inspect.getframeinfo() now correctly shows the first line of

a context. Patch by Sam Breese.

- Issue #29094: Offsets in a ZIP file created with extern file object and modes

"w" and "x" now are relative to the start of the file.

- Issue #13051: Fixed recursion errors in large or resized

curses.textpad.Textbox. Based on patch by Tycho Andersen.

- Issue #29119: Fix weakrefs in the pure python version of

collections.OrderedDict move_to_end() method.

Contributed by Andra Bogildea.

- Issue #9770: curses.ascii predicates now work correctly with negative

integers.

- Issue #28427: old keys should not remove new values from

WeakValueDictionary when collecting from another thread.

- Issue 28923: Remove editor artifacts from Tix.py.

- Issue #28871: Fixed a crash when deallocate deep ElementTree.

- Issue #19542: Fix bugs in WeakValueDictionary.setdefault() and

WeakValueDictionary.pop() when a GC collection happens in another

thread.

- Issue #20191: Fixed a crash in resource.prlimit() when pass a sequence that

doesn't own its elements as limits.

- Issue #28779: multiprocessing.set_forkserver_preload() would crash the

forkserver process if a preloaded module instantiated some

multiprocessing objects such as locks.

- Issue #28847: dbm.dumb now supports reading read-only files and no longer

writes the index file when it is not changed.

- Issue #25659: In ctypes, prevent a crash calling the from_buffer() and

from_buffer_copy() methods on abstract classes like Array.

- Issue #28732: Fix crash in os.spawnv() with no elements in args

- Issue #28485: Always raise ValueError for negative

compileall.compile_dir(workers=...) parameter, even when multithreading is

unavailable.

- Issue #28387: Fixed possible crash in _io.TextIOWrapper deallocator when

the garbage collector is invoked in other thread. Based on patch by

Sebastian Cufre.

- Issue #27517: LZMA compressor and decompressor no longer raise exceptions if

given empty data twice. Patch by Benjamin Fogle.

- Issue #28549: Fixed segfault in curses's addch() with ncurses6.

- Issue #28449: tarfile.open() with mode "r" or "r:" now tries to open a tar

file with compression before trying to open it without compression. Otherwise

it had 50% chance failed with ignore_zeros=True.

- Issue #23262: The webbrowser module now supports Firefox 36+ and derived

browsers. Based on patch by Oleg Broytman.

- Issue #27939: Fixed bugs in tkinter.ttk.LabeledScale and tkinter.Scale caused

by representing the scale as float value internally in Tk. tkinter.IntVar

now works if float value is set to underlying Tk variable.

- Issue #28255: calendar.TextCalendar().prmonth() no longer prints a space

at the start of new line after printing a month's calendar. Patch by

Xiang Zhang.

- Issue #20491: The textwrap.TextWrapper class now honors non-breaking spaces.

Based on patch by Kaarle Ritvanen.

- Issue #28353: os.fwalk() no longer fails on broken links.

- Issue #25464: Fixed HList.header_exists() in tkinter.tix module by addin

a workaround to Tix library bug.

- Issue #28488: shutil.make_archive() no longer add entry "./" to ZIP archive.

- Issue #24452: Make webbrowser support Chrome on Mac OS X.

- Issue #20766: Fix references leaked by pdb in the handling of SIGINT

handlers.

- Issue #26293: Fixed writing ZIP files that starts not from the start of the

file. Offsets in ZIP file now are relative to the start of the archive in

conforming to the specification.

- Issue #28321: Fixed writing non-BMP characters with binary format in plistlib.

- Issue #28322: Fixed possible crashes when unpickle itertools objects from

incorrect pickle data. Based on patch by John Leitch.

- Fix possible integer overflows and crashes in the mmap module with unusual

usage patterns.

- Issue #1703178: Fix the ability to pass the --link-objects option to the

distutils build_ext command.

- Issue #28253: Fixed calendar functions for extreme months: 0001-01

and 9999-12.

Methods itermonthdays() and itermonthdays2() are reimplemented so

that they don't call itermonthdates() which can cause datetime.date

under/overflow.

- Issue #28275: Fixed possible use after free in the decompress()

methods of the LZMADecompressor and BZ2Decompressor classes.

Original patch by John Leitch.

- Issue #27897: Fixed possible crash in sqlite3.Connection.create_collation()

if pass invalid string-like object as a name. Patch by Xiang Zhang.

- Issue #18893: Fix invalid exception handling in Lib/ctypes/macholib/dyld.py.

Patch by Madison May.

- Issue #27611: Fixed support of default root window in the tkinter.tix module.

- Issue #27348: In the traceback module, restore the formatting of exception

messages like "Exception: None". This fixes a regression introduced in

3.5a2.

- Issue #25651: Allow falsy values to be used for msg parameter of subTest().

- Issue #27932: Prevent memory leak in win32_ver().

- Fix UnboundLocalError in socket._sendfile_use_sendfile.

- Issue #28075: Check for ERROR_ACCESS_DENIED in Windows implementation of

os.stat(). Patch by Eryk Sun.

- Issue #25270: Prevent codecs.escape_encode() from raising SystemError when

an empty bytestring is passed.

- Issue #28181: Get antigravity over HTTPS. Patch by Kaartic Sivaraam.

- Issue #25895: Enable WebSocket URL schemes in urllib.parse.urljoin.

Patch by Gergely Imreh and Markus Holtermann.

- Issue #27599: Fixed buffer overrun in binascii.b2a_qp() and binascii.a2b_qp().

- Issue #19003:m email.generator now replaces only \r and/or \n line

endings, per the RFC, instead of all unicode line endings.

- Issue #28019: itertools.count() no longer rounds non-integer step in range

between 1.0 and 2.0 to 1.

- Issue #25969: Update the lib2to3 grammar to handle the unpacking

generalizations added in 3.5.

- Issue #14977: mailcap now respects the order of the lines in the mailcap

files ("first match"), as required by RFC 1542. Patch by Michael Lazar.

- Issue #24594: Validates persist parameter when opening MSI database

- Issue #17582: xml.etree.ElementTree nows preserves whitespaces in attributes

(Patch by Duane Griffin. Reviewed and approved by Stefan Behnel.)

- Issue #28047: Fixed calculation of line length used for the base64 CTE

in the new email policies.

- Issue #27445: Don't pass str(_charset) to MIMEText.set_payload().

Patch by Claude Paroz.

- Issue #22450: urllib now includes an "Accept: */*" header among the

default headers. This makes the results of REST API requests more

consistent and predictable especially when proxy servers are involved.

- lib2to3.pgen3.driver.load_grammar() now creates a stable cache file

between runs given the same Grammar.txt input regardless of the hash

randomization setting.

- Issue #27570: Avoid zero-length memcpy() etc calls with null source

pointers in the "ctypes" and "array" modules.

- Issue #22233: Break email header lines *only* on the RFC specified CR and LF

characters, not on arbitrary unicode line breaks. This also fixes a bug in

HTTP header parsing.

- Issue 27988: Fix email iter_attachments incorrect mutation of payload list.

- Issue #27691: Fix ssl module's parsing of GEN_RID subject alternative name

fields in X.509 certs.

- Issue #27850: Remove 3DES from ssl module's default cipher list to counter

measure sweet32 attack (CVE-2016-2183).

- Issue #27766: Add ChaCha20 Poly1305 to ssl module's default ciper list.

(Required OpenSSL 1.1.0 or LibreSSL).

- Issue #26470: Port ssl and hashlib module to OpenSSL 1.1.0.

- Remove support for passing a file descriptor to os.access. It never worked but

previously didn't raise.

- Issue #12885: Fix error when distutils encounters symlink.

- Issue #27881: Fixed possible bugs when setting sqlite3.Connection.isolation_level.

Based on patch by Xiang Zhang.

- Issue #27861: Fixed a crash in sqlite3.Connection.cursor() when a factory

creates not a cursor. Patch by Xiang Zhang.

- Issue #19884: Avoid spurious output on OS X with Gnu Readline.

- Issue #27706: Restore deterministic behavior of random.Random().seed()

for string seeds using seeding version 1. Allows sequences of calls

to random() to exactly match those obtained in Python 2.

Patch by Nofar Schnider.

- Issue #10513: Fix a regression in Connection.commit(). Statements should

not be reset after a commit.

- A new version of typing.py from https://github.com/python/typing:

- Collection (only for 3.6) (Issue #27598)

- Add FrozenSet to __all__ (upstream #261)

- fix crash in _get_type_vars() (upstream #259)

- Remove the dict constraint in ForwardRef._eval_type (upstream #252)

- Issue #27539: Fix unnormalised ``Fraction.__pow__`` result in the case

of negative exponent and negative base.

- Issue #21718: cursor.description is now available for queries using CTEs.

- Issue #2466: posixpath.ismount now correctly recognizes mount points which

the user does not have permission to access.

- Issue #27773: Correct some memory management errors server_hostname in

_ssl.wrap_socket().

- Issue #26750: unittest.mock.create_autospec() now works properly for

subclasses of property() and other data descriptors.

- In the curses module, raise an error if window.getstr() or window.instr() is

passed a negative value.

- Issue #27783: Fix possible usage of uninitialized memory in

operator.methodcaller.

- Issue #27774: Fix possible Py_DECREF on unowned object in _sre.

- Issue #27760: Fix possible integer overflow in binascii.b2a_qp.

- Issue #27758: Fix possible integer overflow in the _csv module for large

record lengths.

- Issue #27568: Prevent HTTPoxy attack (CVE-2016-1000110). Ignore the

HTTP_PROXY variable when REQUEST_METHOD environment is set, which indicates

that the script is in CGI mode.

- Issue #27656: Do not assume sched.h defines any SCHED_* constants.

- Issue #27130: In the "zlib" module, fix handling of large buffers

(typically 4 GiB) when compressing and decompressing. Previously, inputs

were limited to 4 GiB, and compression and decompression operations did not

properly handle results of 4 GiB.

- Issue #27533: Release GIL in nt._isdir

- Issue #17711: Fixed unpickling by the persistent ID with protocol 0.

Original patch by Alexandre Vassalotti.

- Issue #27522: Avoid an unintentional reference cycle in email.feedparser.

- Issue #26844: Fix error message for imp.find_module() to refer to 'path'

instead of 'name'. Patch by Lev Maximov.

- Issue #23804: Fix SSL zero-length recv() calls to not block and not raise

an error about unclean EOF.

- Issue #27466: Change time format returned by http.cookie.time2netscape,

confirming the netscape cookie format and making it consistent with

documentation.

- Issue #26664: Fix activate.fish by removing mis-use of ``$``.

- Issue #22115: Fixed tracing Tkinter variables: trace_vdelete() with wrong

mode no longer break tracing, trace_vinfo() now always returns a list of

pairs of strings, tracing in the "u" mode now works.

- Fix a scoping issue in importlib.util.LazyLoader which triggered an

UnboundLocalError when lazy-loading a module that was already put into

sys.modules.

- Issue #27079: Fixed curses.ascii functions isblank(), iscntrl() and ispunct().

- Issue #26754: Some functions (compile() etc) accepted a filename argument

encoded as an iterable of integers. Now only strings and byte-like objects

are accepted.

- Issue #27048: Prevents distutils failing on Windows when environment

variables contain non-ASCII characters

- Issue #27330: Fixed possible leaks in the ctypes module.

- Issue #27238: Got rid of bare excepts in the turtle module. Original patch

by Jelle Zijlstra.

- Issue #27122: When an exception is raised within the context being managed

by a contextlib.ExitStack() and one of the exit stack generators

catches and raises it in a chain, do not re-raise the original exception

when exiting, let the new chained one through. This avoids the PEP 479

bug described in issue25782.

- [Security] Issue #27278: Fix os.urandom() implementation using getrandom() on

Linux. Truncate size to INT_MAX and loop until we collected enough random

bytes, instead of casting a directly Py_ssize_t to int.

- Issue #26386: Fixed ttk.TreeView selection operations with item id's

containing spaces.

- [Security] Issue #22636: Avoid shell injection problems with

ctypes.util.find_library().

- Issue #16182: Fix various functions in the "readline" module to use the

locale encoding, and fix get_begidx() and get_endidx() to return code point

indexes.

- Issue #27392: Add loop.connect_accepted_socket().

Patch by Jim Fulton.

- Issue #27930: Improved behaviour of logging.handlers.QueueListener.

Thanks to Paulo Andrade and Petr Viktorin for the analysis and patch.

- Issue #21201: Improves readability of multiprocessing error message. Thanks

to Wojciech Walczak for patch.

- Issue #27456: asyncio: Set TCP_NODELAY by default.

- Issue #27906: Fix socket accept exhaustion during high TCP traffic.

Patch by Kevin Conway.

- Issue #28174: Handle when SO_REUSEPORT isn't properly supported.

Patch by Seth Michael Larson.

- Issue #26654: Inspect functools.partial in asyncio.Handle.__repr__.

Patch by iceboy.

- Issue #26909: Fix slow pipes IO in asyncio.

Patch by INADA Naoki.

- Issue #28176: Fix callbacks race in asyncio.SelectorLoop.sock_connect.

- Issue #27759: Fix selectors incorrectly retain invalid file descriptors.

Patch by Mark Williams.

- Issue #28368: Refuse monitoring processes if the child watcher has

no loop attached.

Patch by Vincent Michel.

- Issue #28369: Raise RuntimeError when transport's FD is used with

add_reader, add_writer, etc.

- Issue #28370: Speedup asyncio.StreamReader.readexactly.

Patch by Коренберг Марк.

- Issue #28371: Deprecate passing asyncio.Handles to run_in_executor.

- Issue #28372: Fix asyncio to support formatting of non-python coroutines.

- Issue #28399: Remove UNIX socket from FS before binding.

Patch by Коренберг Марк.

- Issue #27972: Prohibit Tasks to await on themselves.

- Issue #26923: Fix asyncio.Gather to refuse being cancelled once all

children are done.

Patch by Johannes Ebke.

- Issue #26796: Don't configure the number of workers for default

threadpool executor.

Initial patch by Hans Lawrenz.

- Issue #28600: Optimize loop.call_soon().

- Issue #28613: Fix get_event_loop() return the current loop if

called from coroutines/callbacks.

- Issue #28639: Fix inspect.isawaitable to always return bool

Patch by Justin Mayfield.

- Issue #28652: Make loop methods reject socket kinds they do not support.

- Issue #28653: Fix a refleak in functools.lru_cache.

- Issue #28703: Fix asyncio.iscoroutinefunction to handle Mock objects.

- Issue #24142: Reading a corrupt config file left the parser in an

invalid state. Original patch by Florian Höch.

- Issue #28990: Fix SSL hanging if connection is closed before handshake

completed.

(Patch by HoHo-Ho)

IDLE

----

- Issue #15308: Add 'interrupt execution' (^C) to Shell menu.

Patch by Roger Serwy, updated by Bayard Randel.

- Issue #27922: Stop IDLE tests from 'flashing' gui widgets on the screen.

- Add version to title of IDLE help window.

- Issue #25564: In section on IDLE -- console differences, mention that

using exec means that __builtins__ is defined for each statement.

- Issue #27714: text_textview and test_autocomplete now pass when re-run

in the same process. This occurs when test_idle fails when run with the

-w option but without -jn. Fix warning from test_config.

- Issue #25507: IDLE no longer runs buggy code because of its tkinter imports.

Users must include the same imports required to run directly in Python.

- Issue #27452: add line counter and crc to IDLE configHandler test dump.

- Issue #27365: Allow non-ascii chars in IDLE NEWS.txt, for contributor names.

- Issue #27245: IDLE: Cleanly delete custom themes and key bindings.

Previously, when IDLE was started from a console or by import, a cascade

of warnings was emitted. Patch by Serhiy Storchaka.

C API

-----

- Issue #28808: PyUnicode_CompareWithASCIIString() now never raises exceptions.

- Issue #26754: PyUnicode_FSDecoder() accepted a filename argument encoded as

an iterable of integers. Now only strings and bytes-like objects are accepted.

Documentation

-------------

- Issue #28513: Documented command-line interface of zipfile.

Tests

-----

- Issue #28950: Disallow -j0 to be combined with -T/-l/-M in regrtest

command line arguments.

- Issue #28666: Now test.support.rmtree is able to remove unwritable or

unreadable directories.

- Issue #23839: Various caches now are cleared before running every test file.

- Issue #28409: regrtest: fix the parser of command line arguments.

- Issue #27787: Call gc.collect() before checking each test for "dangling

threads", since the dangling threads are weak references.

- Issue #27369: In test_pyexpat, avoid testing an error message detail that

changed in Expat 2.2.0.

Tools/Demos

-----------

- Issue #27952: Get Tools/scripts/fixcid.py working with Python 3 and the

current "re" module, avoid invalid Python backslash escapes, and fix a bug

parsing escaped C quote signs.

- Issue #27332: Fixed the type of the first argument of module-level functions

generated by Argument Clinic. Patch by Petr Viktorin.

- Issue #27418: Fixed Tools/importbench/importbench.py.

Windows

-------

- Issue #28251: Improvements to help manuals on Windows.

- Issue #28110: launcher.msi has different product codes between 32-bit and

64-bit

- Issue #25144: Ensures TargetDir is set before continuing with custom

install.

- Issue #27469: Adds a shell extension to the launcher so that drag and drop

works correctly.

- Issue #27309: Enabled proper Windows styles in python[w].exe manifest.

Build

-----

- Issue #29080: Removes hard dependency on hg.exe from PCBuild/build.bat

- Issue #23903: Added missed names to PC/python3.def.

- Issue #10656: Fix out-of-tree building on AIX. Patch by Tristan Carel and

Michael Haubenwallner.

- Issue #26359: Rename --with-optimiations to --enable-optimizations.

- Issue #28444: Fix missing extensions modules when cross compiling.

- Issue #28248: Update Windows build and OS X installers to use OpenSSL 1.0.2j.

- Issue #28258: Fixed build with Estonian locale (python-config and distclean

targets in Makefile). Patch by Arfrever Frehtes Taifersar Arahesis.

- Issue #26661: setup.py now detects system libffi with multiarch wrapper.

- Issue #28066: Fix the logic that searches build directories for generated

include files when building outside the source tree.

- Issue #15819: Remove redundant include search directory option for building

outside the source tree.

- Issue #27566: Fix clean target in freeze makefile (patch by Lisa Roach)

- Issue #27705: Update message in validate_ucrtbase.py

- Issue #27983: Cause lack of llvm-profdata tool when using clang as

required for PGO linking to be a configure time error rather than

make time when --with-optimizations is enabled. Also improve our

ability to find the llvm-profdata tool on MacOS and some Linuxes.

- Issue #26307: The profile-opt build now applies PGO to the built-in modules.

- Issue #26359: Add the --with-optimizations configure flag.

- Issue #27713: Suppress spurious build warnings when updating importlib's

bootstrap files. Patch by Xiang Zhang

- Issue #25825: Correct the references to Modules/python.exp and ld_so_aix,

which are required on AIX. This updates references to an installation path

that was changed in 3.2a4, and undoes changed references to the build tree

that were made in 3.5.0a1.

- Issue #27453: CPP invocation in configure must use CPPFLAGS. Patch by

Chi Hsuan Yen.

- Issue #27641: The configure script now inserts comments into the makefile

to prevent the pgen and _freeze_importlib executables from being cross-

compiled.

- Issue #26662: Set PYTHON_FOR_GEN in configure as the Python program to be

used for file generation during the build.

- Issue #10910: Avoid C++ compilation errors on FreeBSD and OS X.

Also update FreedBSD version checks for the original ctype UTF-8 workaround.

- Issue #28676: Prevent missing 'getentropy' declaration warning on macOS.

Patch by Gareth Rees.

What's New in Python 3.5.2?

===========================

Release date: 2016-06-26

Core and Builtins

-----------------

- Issue #26930: Update Windows builds to use OpenSSL 1.0.2h.

Tests

-----

- Issue #26867: Ubuntu's openssl OP_NO_SSLv3 is forced on by default; fix test.

IDLE

----

- Issue #27365: Allow non-ascii in idlelib/NEWS.txt - minimal part for 3.5.2.

What's New in Python 3.5.2 release candidate 1?

===============================================

Release date: 2016-06-12

Core and Builtins

-----------------

- Issue #27066: Fixed SystemError if a custom opener (for open()) returns a

negative number without setting an exception.

- Issue #20041: Fixed TypeError when frame.f_trace is set to None.

Patch by Xavier de Gaye.

- Issue #26168: Fixed possible refleaks in failing Py_BuildValue() with the "N"

format unit.

- Issue #26991: Fix possible refleak when creating a function with annotations.

- Issue #27039: Fixed bytearray.remove() for values greater than 127. Patch by

Joe Jevnik.

- Issue #23640: int.from_bytes() no longer bypasses constructors for subclasses.

- Issue #26811: gc.get_objects() no longer contains a broken tuple with NULL

pointer.

- Issue #20120: Use RawConfigParser for .pypirc parsing,

removing support for interpolation unintentionally added

with move to Python 3. Behavior no longer does any

interpolation in .pypirc files, matching behavior in Python

2.7 and Setuptools 19.0.

- Issue #26659: Make the builtin slice type support cycle collection.

- Issue #26718: super.__init__ no longer leaks memory if called multiple times.

NOTE: A direct call of super.__init__ is not endorsed!

- Issue #25339: PYTHONIOENCODING now has priority over locale in setting the

error handler for stdin and stdout.

- Issue #26494: Fixed crash on iterating exhausting iterators.

Affected classes are generic sequence iterators, iterators of str, bytes,

bytearray, list, tuple, set, frozenset, dict, OrderedDict, corresponding

views and os.scandir() iterator.

- Issue #26581: If coding cookie is specified multiple times on a line in

Python source code file, only the first one is taken to account.

- Issue #26464: Fix str.translate() when string is ASCII and first replacements

removes character, but next replacement uses a non-ASCII character or a

string longer than 1 character. Regression introduced in Python 3.5.0.

- Issue #22836: Ensure exception reports from PyErr_Display() and

PyErr_WriteUnraisable() are sensible even when formatting them produces

secondary errors. This affects the reports produced by

sys.__excepthook__() and when __del__() raises an exception.

- Issue #26302: Correct behavior to reject comma as a legal character for

cookie names.

- Issue #4806: Avoid masking the original TypeError exception when using star

(*) unpacking in function calls. Based on patch by Hagen Fürstenau and

Daniel Urban.

- Issue #27138: Fix the doc comment for FileFinder.find_spec().

- Issue #26154: Add a new private _PyThreadState_UncheckedGet() function to get

the current Python thread state, but don't issue a fatal error if it is NULL.

This new function must be used instead of accessing directly the

_PyThreadState_Current variable. The variable is no more exposed since

Python 3.5.1 to hide the exact implementation of atomic C types, to avoid

compiler issues.

- Issue #26194: Deque.insert() gave odd results for bounded deques that had

reached their maximum size. Now an IndexError will be raised when attempting

to insert into a full deque.

- Issue #25843: When compiling code, don't merge constants if they are equal

but have a different types. For example, ``f1, f2 = lambda: 1, lambda: 1.0``

is now correctly compiled to two different functions: ``f1()`` returns ``1``

(``int``) and ``f2()`` returns ``1.0`` (``int``), even if ``1`` and ``1.0``

are equal.

- Issue #22995: [UPDATE] Comment out the one of the pickleability tests in

_PyObject_GetState() due to regressions observed in Cython-based projects.

- Issue #25961: Disallowed null characters in the type name.

- Issue #25973: Fix segfault when an invalid nonlocal statement binds a name

starting with two underscores.

- Issue #22995: Instances of extension types with a state that aren't

subclasses of list or dict and haven't implemented any pickle-related

methods (__reduce__, __reduce_ex__, __getnewargs__, __getnewargs_ex__,

or __getstate__), can no longer be pickled. Including memoryview.

- Issue #20440: Massive replacing unsafe attribute setting code with special

macro Py_SETREF.

- Issue #25766: Special method __bytes__() now works in str subclasses.

- Issue #25421: __sizeof__ methods of builtin types now use dynamic basic size.

This allows sys.getsize() to work correctly with their subclasses with

__slots__ defined.

- Issue #25709: Fixed problem with in-place string concatenation and utf-8

cache.

- Issue #27147: Mention PEP 420 in the importlib docs.

- Issue #24097: Fixed crash in object.__reduce__() if slot name is freed inside