+++++++++++

Python News

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What's New in Python 3.4.1?

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

Core and Builtins

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

- Issue #20637: Key-sharing now also works for instance dictionaries of

subclasses. Patch by Peter Ingebretson.

Library

-------

- Issue #19748: On AIX, time.mktime() now raises an OverflowError for year

outsize range [1902; 2037].

Tests

-----

- Issue #20743: Fix a reference leak in test_tcl.

What's New in Python 3.4.0 release candidate 2?

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

Release date: 2014-02-23

Core and Builtins

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

- Issue #20261: In pickle, lookup __getnewargs__ and __getnewargs_ex__ on the

type of the object.

- Issue #20619: Give the AST nodes of keyword-only arguments a column and line

number.

- Issue #20526: Revert changes of issue #19466 which introduces a regression:

don't clear anymore the state of Python threads early during the Python

shutdown.

- Issue #20595: Make getargs.c C89 compliant.

- Issue #20625: Parameter names in __annotations__ were not mangled properly.

Discovered by Jonas Wielicki, patch by Yury Selivanov.

Library

-------

- Issue #20710: The pydoc summary line no longer displays the "self" parameter

for bound methods.

- Issue #20654: Fixed pydoc for enums with zero value. Patch by Vajrasky Kok.

- Issue #20635: Fixed grid_columnconfigure() and grid_rowconfigure() methods of

Tkinter widgets to work in wantobjects=True mode.

- Issue #19612: On Windows, subprocess.Popen.communicate() now ignores

OSError(22, 'Invalid argument') when writing input data into stdin, whereas

the process already exited.

- Issue #20320: select.select() and select.kqueue.control() now round the

timeout aways from zero, instead of rounding towards zero.

- Issue #20616: Add a format() method to tracemalloc.Traceback.

- Issue #19744: the ensurepip installation step now just prints a warning to

stderr rather than failing outright if SSL/TLS is unavailable. This allows

local installation of POSIX builds without SSL/TLS support.

- Issue #6815: os.path.expandvars() now supports non-ASCII environment

variables names and values.

- Issue #17671: Fixed a crash when use non-initialized io.BufferedRWPair.

Based on patch by Stephen Tu.

- Issue #8478: Untokenizer.compat processes first token from iterator input.

Patch based on lines from Georg Brandl, Eric Snow, and Gareth Rees.

- Issue #20594: Avoid name clash with the libc function posix_close.

- Issue #19856: shutil.move() failed to move a directory to other directory

on Windows if source name ends with os.altsep.

- Issue #20673: Implement support for UNIX Domain Sockets in asyncio.

New APIs: loop.create_unix_connection(), loop.create_unix_server(),

streams.open_unix_connection(), and streams.start_unix_server().

- Issue #20681: Add new error handling API in asyncio. New APIs:

loop.set_exception_handler(), loop.default_exception_handler(), and

loop.call_exception_handler().

- Issue #20684: Fix inspect.getfullargspec() to not to follow __wrapped__

chains. Make its behaviour consistent with bound methods first argument.

Patch by Nick Coghlan and Yury Selivanov.

- Issue #20566: Change asyncio.as_completed() to use a Queue, to

avoid O(N**2) behavior.

- Issue #20704: Implement new debug API in asyncio. Add new methods

BaseEventLoop.set_debug() and BaseEventLoop.get_debug().

Add support for setting 'asyncio.tasks._DEBUG' variable with

'PYTHONASYNCIODEBUG' environment variable.

- asyncio: Refactoring and fixes: BaseEventLoop.sock_connect() raises an

error if the address is not resolved; use __slots__ in Handle and

TimerHandle; as_completed() and wait() raise TypeError if the passed

list of Futures is a single Future; call_soon() and other 'call_*()'

functions raise TypeError if the passed callback is a coroutine

function; _ProactorBasePipeTransport uses _FlowControlMixin;

WriteTransport.set_write_buffer_size() calls _maybe_pause_protocol()

to consider pausing receiving if the watermark limits have changed;

fix _check_resolved_address() for IPv6 address; and other minor

improvements, along with multiple documentation updates.

Tests

-----

- Issue #20510: Rewrote test_exit in test_sys to match existing comments,

use modern unittest features, and use helpers from test.script_helper

instead of using subprocess directly. Patch by Gareth Rees.

- Issue #20605: Make test_socket getaddrinfo OS X segfault test more robust.

Build

-----

- Issue #20641: Run MSI custom actions (pip installation, pyc compilation)

with the NoImpersonate flag, to support elevated execution (UAC).

- Issue #20221: Removed conflicting (or circular) hypot definition when

compiled with VS 2010 or above. Initial patch by Tabrez Mohammed.

- Issue #20609: Restored the ability to build 64-bit Windows binaries on

32-bit Windows, which was broken by the change in issue #19788.

What's New in Python 3.4.0 release candidate 1?

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

Release date: 2014-02-10

Core and Builtins

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

- Issue #19255: The builtins module is restored to initial value before

cleaning other modules. The sys and builtins modules are cleaned last.

- Issue #20588: Make Python-ast.c C89 compliant.

- Issue #20437: Fixed 22 potential bugs when deleting objects references.

- Issue #20500: Displaying an exception at interpreter shutdown no longer

risks triggering an assertion failure in PyObject_Str.

- Issue #20538: UTF-7 incremental decoder produced inconsistent string when

input was truncated in BASE64 section.

- Issue #20404: io.TextIOWrapper (and hence the open() builtin) now uses the

internal codec marking system added for issue #19619 to throw LookupError

for known non-text encodings at stream construction time. The existing

output type checks remain in place to deal with unmarked third party

codecs.

- Issue #17162: Add PyType_GetSlot.

- Issue #20162: Fix an alignment issue in the siphash24() hash function which

caused a crash on PowerPC 64-bit (ppc64).

Library

-------

- Issue #20530: The signatures for slot builtins have been updated

to reflect the fact that they only accept positional-only arguments.

- Issue #20517: Functions in the os module that accept two filenames

now register both filenames in the exception on failure.

- Issue #20563: The ipaddress module API is now considered stable.

- Issue #14983: email.generator now always adds a line end after each MIME

boundary marker, instead of doing so only when there is an epilogue. This

fixes an RFC compliance bug and solves an issue with signed MIME parts.

- Issue #20540: Fix a performance regression (vs. Python 3.2) when layering

a multiprocessing Connection over a TCP socket. For small payloads, Nagle's

algorithm would introduce idle delays before the entire transmission of a

message.

- Issue #16983: the new email header parsing code will now decode encoded words

that are (incorrectly) surrounded by quotes, and register a defect.

- Issue #19772: email.generator no longer mutates the message object when

doing a down-transform from 8bit to 7bit CTEs.

- Issue #20536: the statistics module now correctly handle Decimal instances

with positive exponents

- Issue #18805: the netmask/hostmask parsing in ipaddress now more reliably

filters out illegal values and correctly allows any valid prefix length.

- Issue #20481: For at least Python 3.4, the statistics module will require

that all inputs for a single operation be of a single consistent type, or

else a mixed of ints and a single other consistent type. This avoids

some interoperability issues that arose with the previous approach of

coercing to a suitable common type.

- Issue #20478: the statistics module now treats collections.Counter inputs

like any other iterable.

- Issue #17369: get_filename was raising an exception if the filename

parameter's RFC2231 encoding was broken in certain ways. This was

a regression relative to python2.

- Issue #20013: Some imap servers disconnect if the current mailbox is

deleted, and imaplib did not handle that case gracefully. Now it

handles the 'bye' correctly.

- Issue #20531: Revert 3.4 version of fix for #19063, and apply the 3.3

version. That is, do *not* raise an error if unicode is passed to

email.message.Message.set_payload.

- Issue #20476: If a non-compat32 policy is used with any of the email parsers,

EmailMessage is now used as the factory class. The factory class should

really come from the policy; that will get fixed in 3.5.

- Issue #19920: TarFile.list() no longer fails when outputs a listing

containing non-encodable characters. Based on patch by Vajrasky Kok.

- Issue #20515: Fix NULL pointer dereference introduced by issue #20368.

- Issue #19186: Restore namespacing of expat symbols inside the pyexpat module.

- Issue #20053: ensurepip (and hence venv) are no longer affected by the

settings in the default pip configuration file.

- Issue #20426: When passing the re.DEBUG flag, re.compile() displays the

debug output every time it is called, regardless of the compilation cache.

- Issue #20368: The null character now correctly passed from Tcl to Python.

Improved error handling in variables-related commands.

- Issue #20435: Fix _pyio.StringIO.getvalue() to take into account newline

translation settings.

- tracemalloc: Fix slicing traces and fix slicing a traceback.

- Issue #20354: Fix an alignment issue in the tracemalloc module on 64-bit

platforms. Bug seen on 64-bit Linux when using "make profile-opt".

- Issue #17159: inspect.signature now accepts duck types of functions,

which adds support for Cython functions. Initial patch by Stefan Behnel.

- Issue #18801: Fix inspect.classify_class_attrs to correctly classify

object.__new__ and object.__init__.

- Fixed cmath.isinf's name in its argument parsing code.

- Issue #20311, #20452: poll and epoll now round the timeout away from zero,

instead of rounding towards zero, in select and selectors modules:

select.epoll.poll(), selectors.PollSelector.poll() and

selectors.EpollSelector.poll(). For example, a timeout of one microsecond

(1e-6) is now rounded to one millisecondi (1e-3), instead of being rounded to

zero. However, the granularity property and asyncio's resolution feature

were removed again.

- asyncio: Some refactoring; various fixes; add write flow control to

unix pipes; Future.set_exception() instantiates the exception

argument if it is a class; improved proactor pipe transport; support

wait_for(f, None); don't log broken/disconnected pipes; use

ValueError instead of assert for forbidden subprocess_{shell,exec}

arguments; added a convenience API for subprocess management; added

StreamReader.at_eof(); properly handle duplicate coroutines/futures

in gather(), wait(), as_completed(); use a bytearray for buffering

in StreamReader; and more.

- Issue #20288: fix handling of invalid numeric charrefs in HTMLParser.

- Issue #20424: Python implementation of io.StringIO now supports lone surrogates.

- Issue #20308: inspect.signature now works on classes without user-defined

__init__ or __new__ methods.

- Issue #20372: inspect.getfile (and a bunch of other inspect functions that

use it) doesn't crash with unexpected AttributeError on classes defined in C

without __module__.

- Issue #20356: inspect.signature formatting uses '/' to separate

positional-only parameters from others.

- Issue #20223: inspect.signature now supports methods defined with

functools.partialmethods.

- Issue #19456: ntpath.join() now joins relative paths correctly when a drive

is present.

- Issue #19077: tempfile.TemporaryDirectory cleanup no longer fails when

called during shutdown. Emitting resource warning in __del__ no longer fails.

Original patch by Antoine Pitrou.

- Issue #20394: Silence Coverity warning in audioop module.

- Issue #20367: Fix behavior of concurrent.futures.as_completed() for

duplicate arguments. Patch by Glenn Langford.

- Issue #8260: The read(), readline() and readlines() methods of

codecs.StreamReader returned incomplete data when were called after

readline() or read(size). Based on patch by Amaury Forgeot d'Arc.

- Issue #20105: the codec exception chaining now correctly sets the

traceback of the original exception as its __traceback__ attribute.

- Issue #17481: inspect.getfullargspec() now uses inspect.signature() API.

- Issue #15304: concurrent.futures.wait() can block forever even if

Futures have completed. Patch by Glenn Langford.

- Issue #14455: plistlib: fix serializing integers integers in the range

of an unsigned long long but outside of the range of signed long long for

binary plist files.

IDLE

----

- Issue #20406: Use Python application icons for Idle window title bars.

Patch mostly by Serhiy Storchaka.

- Update the python.gif icon for the Idle classbrowser and pathbowser

from the old green snake to the new new blue and yellow snakes.

- Issue #17721: Remove non-functional configuration dialog help button until we

make it actually gives some help when clicked. Patch by Guilherme Simões.

Tests

-----

- Issue #20532: Tests which use _testcapi now are marked as CPython only.

- Issue #19920: Added tests for TarFile.list(). Based on patch by Vajrasky Kok.

- Issue #19990: Added tests for the imghdr module. Based on patch by

Claudiu Popa.

- Issue #20474: Fix test_socket "unexpected success" failures on OS X 10.7+.

Tools/Demos

-----------

- Issue #20530: Argument Clinic's signature format has been revised again.

The new syntax is highly human readable while still preventing false

positives. The syntax also extends Python syntax to denote "self" and

positional-only parameters, allowing inspect.Signature objects to be

totally accurate for all supported builtins in Python 3.4.

- Issue #20456: Argument Clinic now observes the C preprocessor conditional

compilation statements of the C files it parses. When a Clinic block is

inside a conditional code, it adjusts its output to match, including

automatically generating an empty methoddef macro.

- Issue #20456: Cloned functions in Argument Clinic now use the correct

name, not the name of the function they were cloned from, for text

strings inside generated code.

- Issue #20456: Fixed Argument Clinic's test suite and "--converters" feature.

- Issue #20456: Argument Clinic now allows specifying different names

for a parameter in Python and C, using "as" on the parameter line.

- Issue #20326: Argument Clinic now uses a simple, unique signature to

annotate text signatures in docstrings, resulting in fewer false

positives. "self" parameters are also explicitly marked, allowing

inspect.Signature() to authoritatively detect (and skip) said parameters.

- Issue #20326: Argument Clinic now generates separate checksums for the

input and output sections of the block, allowing external tools to verify

that the input has not changed (and thus the output is not out-of-date).

Build

-----

- Issue #20465: Update SQLite shipped with OS X installer to 3.8.3.

C-API

-----

- Issue #20517: Added new functions allowing OSError exceptions to reference

two filenames instead of one: PyErr_SetFromErrnoWithFilenameObjects() and

PyErr_SetExcFromWindowsErrWithFilenameObjects().

Documentation

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

- Issue #20488: Change wording to say importlib is *the* implementation of

import instead of just *an* implementation.

- Issue #6386: Clarify in the tutorial that specifying a symlink to execute

means the directory containing the executed script and not the symlink is

added to sys.path.

What's New in Python 3.4.0 Beta 3?

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

Release date: 2014-01-26

Core and Builtins

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

- Issue #20189: Four additional builtin types (PyTypeObject,

PyMethodDescr_Type, _PyMethodWrapper_Type, and PyWrapperDescr_Type)

have been modified to provide introspection information for builtins.

- Issue #17825: Cursor "^" is correctly positioned for SyntaxError and

IndentationError.

- Issue #2382: SyntaxError cursor "^" is now written at correct position in most

cases when multibyte characters are in line (before "^"). This still not

works correctly with wide East Asian characters.

- Issue #18960: The first line of Python script could be executed twice when

the source encoding was specified on the second line. Now the source encoding

declaration on the second line isn't effective if the first line contains

anything except a comment. 'python -x' works now again with files with the

source encoding declarations, and can be used to make Python batch files

on Windows.

Library

-------

- asyncio: Various improvements and small changes not all covered by

issues listed below. E.g. wait_for() now cancels the inner task if

the timeout occcurs; tweaked the set of exported symbols; renamed

Empty/Full to QueueEmpty/QueueFull; "with (yield from lock)" now

uses a separate context manager; readexactly() raises if not enough

data was read; PTY support tweaks.

- Issue #20311: asyncio: Add a granularity attribute to BaseEventLoop: maximum

between the resolution of the BaseEventLoop.time() method and the resolution

of the selector. The granuarility is used in the scheduler to round time and

deadline.

- Issue #20311: selectors: Add a resolution attribute to BaseSelector.

- Issue #20189: unittest.mock now no longer assumes that any object for

which it could get an inspect.Signature is a callable written in Python.

Fix courtesy of Michael Foord.

- Issue #20317: ExitStack.__exit__ could create a self-referential loop if an

exception raised by a cleanup operation already had its context set

correctly (for example, by the @contextmanager decorator). The infinite

loop this caused is now avoided by checking if the expected context is

already set before trying to fix it.

- Issue #20374: Fix build with GNU readline >= 6.3.

- Issue #20262: Warnings are raised now when duplicate names are added in the

ZIP file or too long ZIP file comment is truncated.

- Issue #20165: The unittest module no longer considers tests marked with

@expectedFailure successful if they pass.

- Issue #18574: Added missing newline in 100-Continue reply from

http.server.BaseHTTPRequestHandler. Patch by Nikolaus Rath.

- Issue #20270: urllib.urlparse now supports empty ports.

- Issue #20243: TarFile no longer raise ReadError when opened in write mode.

- Issue #20238: TarFile opened with external fileobj and "w:gz" mode didn't

write complete output on close.

- Issue #20245: The open functions in the tarfile module now correctly handle

empty mode.

- Issue #20242: Fixed basicConfig() format strings for the alternative

formatting styles. Thanks to kespindler for the bug report and patch.

- Issue #20246: Fix buffer overflow in socket.recvfrom_into.

- Issues #20206 and #5803: Fix edge case in email.quoprimime.encode where it

truncated lines ending in a character needing encoding but no newline by

using a more efficient algorithm that doesn't have the bug.

- Issue #19082: Working xmlrpc.server and xmlrpc.client examples. Both in

modules and in documentation. Initial patch contributed by Vajrasky Kok.

- Issue #20138: The wsgiref.application_uri() and wsgiref.request_uri()

functions now conform to PEP 3333 when handle non-ASCII URLs.

- Issue #19097: Raise the correct Exception when cgi.FieldStorage is given an

invalid fileobj.

- Issue #20152: Ported Python/import.c over to Argument Clinic.

- Issue #13107: argparse and optparse no longer raises an exception when output

a help on environment with too small COLUMNS. Based on patch by

Elazar Gershuni.

- Issue #20207: Always disable SSLv2 except when PROTOCOL_SSLv2 is explicitly

asked for.

- Issue #18960: The tokenize module now ignore the source encoding declaration

on the second line if the first line contains anything except a comment.

- Issue #20078: Reading malformed zipfiles no longer hangs with 100% CPU

consumption.

- Issue #20113: os.readv() and os.writev() now raise an OSError exception on

error instead of returning -1.

- Issue #19719: Make importlib.abc.MetaPathFinder.find_module(),

PathEntryFinder.find_loader(), and Loader.load_module() use PEP 451 APIs to

help with backwards-compatibility.

- Issue #20144: inspect.Signature now supports parsing simple symbolic

constants as parameter default values in __text_signature__.

- Issue #20072: Fixed multiple errors in tkinter with wantobjects is False.

- Issue #20229: Avoid plistlib deprecation warning in platform.mac_ver().

- Issue #14455: Fix some problems with the new binary plist support in plistlib.

IDLE

----

- Issue #17390: Add Python version to Idle editor window title bar.

Original patches by Edmond Burnett and Kent Johnson.

- Issue #18960: IDLE now ignores the source encoding declaration on the second

line if the first line contains anything except a comment.

Tests

-----

- Issue #20358: Tests for curses.window.overlay and curses.window.overwrite

no longer specify min{row,col} > max{row,col}.

- Issue #19804: The test_find_mac test in test_uuid is now skipped if the

ifconfig executable is not available.

- Issue #19886: Use better estimated memory requirements for bigmem tests.

Tools/Demos

-----------

- Issue #20390: Argument Clinic's "file" output preset now defaults to

"{dirname}/clinic/{basename}.h".

- Issue #20390: Argument Clinic's "class" directive syntax has been extended

with two new required arguments: "typedef" and "type_object".

- Issue #20390: Argument Clinic: If __new__ or __init__ functions didn't use

kwargs (or args), the PyArg_NoKeywords (or PyArg_NoPositional) calls

generated are only run when the type object is an exact match.

- Issue #20390: Argument Clinic now fails if you have required parameters after

optional parameters.

- Issue #20390: Argument Clinic converters now have a new template they can

inject code into: "modifiers". Code put there is run in the parsing

function after argument parsing but before the call to the impl.

- Issue #20376: Argument Clinic now escapes backslashes in docstrings.

- Issue #20381: Argument Clinic now sanity checks the default argument when

c_default is also specified, providing a nice failure message for

disallowed values.

- Issue #20189: Argument Clinic now ensures that parser functions for

__new__ are always of type newfunc, the type of the tp_new slot.

Similarly, parser functions for __init__ are now always of type initproc,

the type of tp_init.

- Issue #20189: Argument Clinic now suppresses the docstring for __new__

and __init__ functions if no docstring is provided in the input.

- Issue #20189: Argument Clinic now suppresses the "self" parameter in the

impl for @staticmethod functions.

- Issue #20294: Argument Clinic now supports argument parsing for __new__ and

__init__ functions.

- Issue #20299: Argument Clinic custom converters may now change the default

value of c_default and py_default with a class member.

- Issue #20287: Argument Clinic's output is now configurable, allowing

delaying its output or even redirecting it to a separate file.

- Issue #20226: Argument Clinic now permits simple expressions

(e.g. "sys.maxsize - 1") as default values for parameters.

- Issue #19936: Added executable bits or shebang lines to Python scripts which

requires them. Disable executable bits and shebang lines in test and

benchmark files in order to prevent using a random system python, and in

source files of modules which don't provide command line interface. Fixed

shebang lines in the unittestgui and checkpip scripts.

- Issue #20268: Argument Clinic now supports cloning the parameters and

return converter of existing functions.

- Issue #20228: Argument Clinic now has special support for class special

methods.

- Issue #20214: Fixed a number of small issues and documentation errors in

Argument Clinic (see issue for details).

- Issue #20196: Fixed a bug where Argument Clinic did not generate correct

parsing code for functions with positional-only parameters where all arguments

are optional.

- Issue #18960: 2to3 and the findnocoding.py script now ignore the source

encoding declaration on the second line if the first line contains anything

except a comment.

- Issue #19723: The marker comments Argument Clinic uses have been changed

to improve readability.

- Issue #20157: When Argument Clinic renames a parameter because its name

collides with a C keyword, it no longer exposes that rename to PyArg_Parse.

- Issue #20141: Improved Argument Clinic's support for the PyArg_Parse "O!"

format unit.

- Issue #20144: Argument Clinic now supports simple symbolic constants

as parameter default values.

- Issue #20143: The line numbers reported in Argument Clinic errors are

now more accurate.

- Issue #20142: Py_buffer variables generated by Argument Clinic are now

initialized with a default value.

Build

-----

- Issue #12837: Silence a tautological comparison warning on OS X under Clang in

socketmodule.c.

What's New in Python 3.4.0 Beta 2?

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

Release date: 2014-01-05

Core and Builtins

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

- Issue #17432: Drop UCS2 from names of Unicode functions in python3.def.

- Issue #19526: Exclude all new API from the stable ABI. Exceptions can be

made if a need is demonstrated.

- Issue #19969: PyBytes_FromFormatV() now raises an OverflowError if "%c"

argument is not in range [0; 255].

- Issue #19995: %c, %o, %x, and %X now issue a DeprecationWarning on non-integer

input; reworded docs to clarify that an integer type should define both __int__

and __index__.

- Issue #19787: PyThread_set_key_value() now always set the value. In Python

3.3, the function did nothing if the key already exists (if the current value

is a non-NULL pointer).

- Issue #14432: Remove the thread state field from the frame structure. Fix a

crash when a generator is created in a C thread that is destroyed while the

generator is still used. The issue was that a generator contains a frame, and

the frame kept a reference to the Python state of the destroyed C thread. The

crash occurs when a trace function is setup.

- Issue #19576: PyGILState_Ensure() now initializes threads. At startup, Python

has no concrete GIL. If PyGILState_Ensure() is called from a new thread for

the first time and PyEval_InitThreads() was not called yet, a GIL needs to be

created.

- Issue #17576: Deprecation warning emitted now when __int__() or __index__()

return not int instance.

- Issue #19932: Fix typo in import.h, missing whitespaces in function prototypes.

- Issue #19736: Add module-level statvfs constants defined for GNU/glibc

based systems.

- Issue #20097: Fix bad use of "self" in importlib's WindowsRegistryFinder.

- Issue #19729: In str.format(), fix recursive expansion in format spec.

- Issue #19638: Fix possible crash / undefined behaviour from huge (more than 2

billion characters) input strings in _Py_dg_strtod.

Library

-------

- Issue #20154: Deadlock in asyncio.StreamReader.readexactly().

- Issue #16113: Remove sha3 module again.

- Issue #20111: pathlib.Path.with_suffix() now sanity checks the given suffix.

- Fix breakage in TestSuite.countTestCases() introduced by issue #11798.

- Issue #20108: Avoid parameter name clash in inspect.getcallargs().

- Issue #19918: Fix PurePath.relative_to() under Windows.

- Issue #19422: Explicitly disallow non-SOCK_STREAM sockets in the ssl

module, rather than silently let them emit clear text data.

- Issue #20046: Locale alias table no longer contains entities which can be

calculated. Generalized support of the euro modifier.

- Issue #20027: Fixed locale aliases for devanagari locales.

- Issue #20067: Tkinter variables now work when wantobjects is false.

- Issue #19020: Tkinter now uses splitlist() instead of split() in configure

methods.

- Issue #19744: ensurepip now provides a better error message when Python is

built without SSL/TLS support (pip currently requires that support to run,

even if only operating with local wheel files)

- Issue #19734: ensurepip now ignores all pip environment variables to avoid

odd behaviour based on user configuration settings

- Fix TypeError on "setup.py upload --show-response".

- Issue #20045: Fix "setup.py register --list-classifiers".

- Issue #18879: When a method is looked up on a temporary file, avoid closing

the file before the method is possibly called.

- Issue #20037: Avoid crashes when opening a text file late at interpreter

shutdown.

- Issue #19967: Thanks to the PEP 442, asyncio.Future now uses a

destructor to log uncaught exceptions, instead of the dedicated

_TracebackLogger class.

- Added a Task.current_task() class method to asyncio.

- Issue #19850: Set SA_RESTART in asyncio when registering a signal

handler to limit EINTR occurrences.

- Implemented write flow control in asyncio for proactor event loop (Windows).

- Change write buffer in asyncio use to avoid O(N**2) behavior. Make

write()/sendto() accept bytearray/memoryview.

- Issue #20034: Updated alias mapping to most recent locale.alias file

from X.org distribution using makelocalealias.py.

- Issue #5815: Fixed support for locales with modifiers. Fixed support for

locale encodings with hyphens.

- Issue #20026: Fix the sqlite module to handle correctly invalid isolation

level (wrong type).

- Issue #18829: csv.Dialect() now checks type for delimiter, escapechar and

quotechar fields. Original patch by Vajrasky Kok.

- Issue #19855: uuid.getnode() on Unix now looks on the PATH for the

executables used to find the mac address, with /sbin and /usr/sbin as

fallbacks.

- Issue #20007: HTTPResponse.read(0) no more prematurely closes connection.

Original patch by Simon Sapin.

- Issue #19946: multiprocessing now uses runpy to initialize __main__ in

child processes when necessary, allowing it to correctly handle scripts

without suffixes and submodules that use explicit relative imports or

otherwise rely on parent modules being correctly imported prior to

execution.

- Issue #19921: When Path.mkdir() is called with parents=True, any missing

parent is created with the default permissions, ignoring the mode argument

(mimicking the POSIX "mkdir -p" command).

- Issue #19887: Improve the Path.resolve() algorithm to support certain

symlink chains.

- Issue #19912: Fixed numerous bugs in ntpath.splitunc().

- Issue #19911: ntpath.splitdrive() now correctly processes the 'İ' character

(U+0130, LATIN CAPITAL LETTER I WITH DOT ABOVE).

- Issue #19532: python -m compileall with no filename/directory arguments now

respects the -f and -q flags instead of ignoring them.

- Issue #19623: Fixed writing to unseekable files in the aifc module.

- Issue #19946: multiprocessing.spawn now raises ImportError when the module to

be used as the main module cannot be imported.

- Issue #17919: select.poll.register() again works with poll.POLLNVAL on AIX.

Fixed integer overflow in the eventmask parameter.

- Issue #19063: if a Charset's body_encoding was set to None, the email

package would generate a message claiming the Content-Transfer-Encoding

was 7bit, and produce garbage output for the content. This now works.

A couple of other set_payload mishandlings of non-ASCII are also fixed.

In addition, calling set_payload with a string argument without

specifying a charset now raises an error (this is a new error in 3.4).

- Issue #15475: Add __sizeof__ implementations for itertools objects.

- Issue #19944: Fix importlib.find_spec() so it imports parents as needed

and move the function to importlib.util.

- Issue #19880: Fix a reference leak in unittest.TestCase. Explicitly break

reference cycles between frames and the _Outcome instance.

- Issue #17429: platform.linux_distribution() now decodes files from the UTF-8

encoding with the surrogateescape error handler, instead of decoding from the

locale encoding in strict mode. It fixes the function on Fedora 19 which is

probably the first major distribution release with a non-ASCII name. Patch

written by Toshio Kuratomi.

- Issue #19343: Expose FreeBSD-specific APIs in resource module. Original

patch by Koobs.

- Issue #19929: Call os.read with 32768 within subprocess.Popen.communicate

rather than 4096 for efficiency. A microbenchmark shows Linux and OS X

both using ~50% less cpu time this way.

- Issue #19506: Use a memoryview to avoid a data copy when piping data

to stdin within subprocess.Popen.communicate. 5-10% less cpu usage.

- Issue #19876: selectors unregister() no longer raises ValueError or OSError

if the FD is closed (as long as it was registered).

- Issue #19908: pathlib now joins relative Windows paths correctly when a drive

is present. Original patch by Antoine Pitrou.

- Issue #19296: Silence compiler warning in dbm_open

- Issue #6784: Strings from Python 2 can now be unpickled as bytes

objects by setting the encoding argument of Unpickler to be 'bytes'.

Initial patch by Merlijn van Deen.

- Issue #19839: Fix regression in bz2 module's handling of non-bzip2 data at

EOF, and analogous bug in lzma module.

- Issue #19881: Fix pickling bug where cpickle would emit bad pickle data for

large bytes string (i.e., with size greater than 2**32-1).

- Issue #19138: doctest's IGNORE_EXCEPTION_DETAIL now allows a match when

no exception detail exists (no colon following the exception's name, or

a colon does follow but no text follows the colon).

- Issue #19927: Add __eq__ to path-based loaders in importlib.

- Issue #19827: On UNIX, setblocking() and settimeout() methods of

socket.socket can now avoid a second syscall if the ioctl() function can be

used, or if the non-blocking flag of the socket is unchanged.

- Issue #19785: smtplib now supports SSLContext.check_hostname and server name

indication for TLS/SSL connections.

- Issue #19784: poplib now supports SSLContext.check_hostname and server name

indication for TLS/SSL connections.

- Issue #19783: nntplib now supports SSLContext.check_hostname and server name

indication for TLS/SSL connections.

- Issue #19782: imaplib now supports SSLContext.check_hostname and server name

indication for TLS/SSL connections.

- Issue 20123: Fix pydoc.synopsis() for "binary" modules.

- Issue #19834: Support unpickling of exceptions pickled by Python 2.

- Issue #19781: ftplib now supports SSLContext.check_hostname and server name

indication for TLS/SSL connections.

- Issue #19509: Add SSLContext.check_hostname to match the peer's certificate

with server_hostname on handshake.

- Issue #15798: Fixed subprocess.Popen() to no longer fail if file

descriptor 0, 1 or 2 is closed.

- Issue #17897: Optimized unpickle prefetching.

- Issue #3693: Make the error message more helpful when the array.array()

constructor is given a str. Move the array module typecode documentation to

the docstring of the constructor.

- Issue #19088: Fixed incorrect caching of the copyreg module in

object.__reduce__() and object.__reduce_ex__().

- Issue #19698: Removed exec_module() methods from

importlib.machinery.BuiltinImporter and ExtensionFileLoader.

- Issue #18864: Added a setter for ModuleSpec.has_location.

- Fixed _pickle.Unpickler to not fail when loading empty strings as

persistent IDs.

- Issue #11480: Fixed copy.copy to work with classes with custom metaclasses.

Patch by Daniel Urban.

- Issue #6477: Added support for pickling the types of built-in singletons

(i.e., Ellipsis, NotImplemented, None).

- Issue #19713: Add remaining PEP 451-related deprecations and move away

from using find_module/find_loaer/load_module.

- Issue #19708: Update pkgutil to use the new importer APIs.

- Issue #19703: Update pydoc to use the new importer APIs.

- Issue #19851: Fixed a regression in reloading sub-modules.

- ssl.create_default_context() sets OP_NO_COMPRESSION to prevent CRIME.

- Issue #19802: Add socket.SO_PRIORITY.

- Issue #11508: Fixed uuid.getnode() and uuid.uuid1() on environment with

virtual interface. Original patch by Kent Frazier.

- Issue #11489: JSON decoder now accepts lone surrogates.

- Issue #19545: Avoid chained exceptions while passing stray % to

time.strptime(). Initial patch by Claudiu Popa.

IDLE

----

- Issue #20058: sys.stdin.readline() in IDLE now always returns only one line.

- Issue #19481: print() of string subclass instance in IDLE no longer hangs.

- Issue #18270: Prevent possible IDLE AttributeError on OS X when no initial

shell window is present.

Tests

-----

- Issue #20055: Fix test_shutil under Windows with symlink privileges held.

Patch by Vajrasky Kok.

- Issue #20070: Don't run test_urllib2net when network resources are not

enabled.

- Issue #19938: Re-enabled test_bug_1333982 in test_dis, which had been

disabled since 3.0 due to the changes in listcomp handling.

- Issue #19320: test_tcl no longer fails when wantobjects is false.

- Issue #19919: Fix flaky SSL test. connect_ex() sometimes returns

EWOULDBLOCK on Windows or VMs hosted on Windows.

- Issue #19912: Added tests for ntpath.splitunc().

- Issue #19828: Fixed test_site when the whole suite is run with -S.

- Issue #19928: Implemented a test for repr() of cell objects.

- Issue #19535: Fixed test_docxmlrpc, test_functools, test_inspect, and

test_statistics when python is run with -OO.

- Issue #19926: Removed unneeded test_main from test_abstract_numbers.

Patch by Vajrasky Kok.

- Issue #19572: More skipped tests explicitly marked as skipped.

- Issue #19595, #19987: Re-enabled a long-disabled test in test_winsound.

- Issue #19588: Fixed tests in test_random that were silently skipped most

of the time. Patch by Julian Gindi.

Build

-----

- Issue #19728: Enable pip installation by default on Windows.

- Issue #16136: Remove VMS support

- Issue #18215: Add script Tools/ssl/test_multiple_versions.py to compile and

run Python's unit tests with multiple versions of OpenSSL.

- Issue #19922: define _INCLUDE__STDC_A1_SOURCE in HP-UX to include mbstate_t

for mbrtowc().

- Issue #19788: kill_python(_d).exe is now run as a PreBuildEvent on the

pythoncore sub-project. This should prevent build errors due a previous

build's python(_d).exe still running.

Documentation

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

- Issue #20265: Updated some parts of the Using Windows document.

- Issue #20266: Updated some parts of the Windows FAQ.

- Issue #20255: Updated the about and bugs pages.

- Issue #20253: Fixed a typo in the ipaddress docs that advertised an

illegal attribute name. Found by INADA Naoki.