cpython/Misc/NEWS.d/3.6.0a4.rst

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.. bpo: 27704
.. date: 9455
.. nonce: RUxzHf
.. release date: 2016-08-15
.. section: Core and Builtins
Optimized creating bytes and bytearray from byte-like objects and iterables.
Speed up to 3 times for short objects. Original patch by Naoki Inada.
..
.. bpo: 26823
.. date: 9454
.. nonce: UWORiU
.. section: Core and Builtins
Large sections of repeated lines in tracebacks are now abbreviated as
"[Previous line repeated {count} more times]" by the builtin traceback
rendering. Patch by Emanuel Barry.
..
.. bpo: 27574
.. date: 9453
.. nonce: q73Tss
.. section: Core and Builtins
Decreased an overhead of parsing keyword arguments in functions implemented
with using Argument Clinic.
..
.. bpo: 22557
.. date: 9452
.. nonce: Hta2Rz
.. section: Core and Builtins
Now importing already imported modules is up to 2.5 times faster.
..
.. bpo: 17596
.. date: 9451
.. nonce: XgbA9V
.. section: Core and Builtins
Include <wincrypt.h> to help with Min GW building.
..
.. bpo: 17599
.. date: 9450
.. nonce: noy7o1
.. section: Core and Builtins
On Windows, rename the privately defined REPARSE_DATA_BUFFER structure to
avoid conflicting with the definition from Min GW.
..
.. bpo: 27507
.. date: 9449
.. nonce: 3pX0Be
.. section: Core and Builtins
Add integer overflow check in bytearray.extend(). Patch by Xiang Zhang.
..
.. bpo: 27581
.. date: 9448
.. nonce: KezjNt
.. section: Core and Builtins
Don't rely on wrapping for overflow check in PySequence_Tuple(). Patch by
Xiang Zhang.
..
.. bpo: 1621
.. date: 9447
.. nonce: _FZWTr
.. section: Core and Builtins
Avoid signed integer overflow in list and tuple operations. Patch by Xiang
Zhang.
..
.. bpo: 27419
.. date: 9446
.. nonce: YaGodL
.. section: Core and Builtins
Standard __import__() no longer look up "__import__" in globals or builtins
for importing submodules or "from import". Fixed a crash if raise a warning
about unabling to resolve package from __spec__ or __package__.
..
.. bpo: 27083
.. date: 9445
.. nonce: F4ZT1C
.. section: Core and Builtins
Respect the PYTHONCASEOK environment variable under Windows.
..
.. bpo: 27514
.. date: 9444
.. nonce: NLbwPG
.. section: Core and Builtins
Make having too many statically nested blocks a SyntaxError instead of
SystemError.
..
.. bpo: 27366
.. date: 9443
.. nonce: VrInsj
.. section: Core and Builtins
Implemented PEP 487 (Simpler customization of class creation). Upon
subclassing, the __init_subclass__ classmethod is called on the base class.
Descriptors are initialized with __set_name__ after class creation.
..
.. bpo: 26027
.. date: 9442
.. nonce: nfVMKM
.. section: Library
Add PEP 519/__fspath__() support to the os and os.path modules. Includes
code from Jelle Zijlstra. (See also: bpo-27524)
..
.. bpo: 27598
.. date: 9441
.. nonce: y7PtEV
.. section: Library
Add Collections to collections.abc. Patch by Ivan Levkivskyi, docs by Neil
Girdhar.
..
.. bpo: 25958
.. date: 9440
.. nonce: X-V4U1
.. section: Library
Support "anti-registration" of special methods from various ABCs, like
__hash__, __iter__ or __len__. All these (and several more) can be set to
None in an implementation class and the behavior will be as if the method is
not defined at all. (Previously, this mechanism existed only for __hash__,
to make mutable classes unhashable.) Code contributed by Andrew Barnert and
Ivan Levkivskyi.
..
.. bpo: 16764
.. date: 9439
.. nonce: cPbNjL
.. section: Library
Support keyword arguments to zlib.decompress(). Patch by Xiang Zhang.
..
.. bpo: 27736
.. date: 9438
.. nonce: 8kMhpQ
.. section: Library
Prevent segfault after interpreter re-initialization due to ref count
problem introduced in code for Issue #27038 in 3.6.0a3. Patch by Xiang
Zhang.
..
.. bpo: 25628
.. date: 9437
.. nonce: UcQnHF
.. section: Library
The *verbose* and *rename* parameters for collections.namedtuple are now
keyword-only.
..
.. bpo: 12345
.. date: 9436
.. nonce: nbAEM8
.. section: Library
Add mathematical constant tau to math and cmath. See also PEP 628.
..
.. bpo: 26823
.. date: 9435
.. nonce: HcO8tR
.. section: Library
traceback.StackSummary.format now abbreviates large sections of repeated
lines as "[Previous line repeated {count} more times]" (this change then
further affects other traceback display operations in the module). Patch by
Emanuel Barry.
..
.. bpo: 27664
.. date: 9434
.. nonce: 6DJPxw
.. section: Library
Add to concurrent.futures.thread.ThreadPoolExecutor() the ability to specify
a thread name prefix.
..
.. bpo: 27181
.. date: 9433
.. nonce: 8aw9TZ
.. section: Library
Add geometric_mean and harmonic_mean to statistics module.
..
.. bpo: 27573
.. date: 9432
.. nonce: B7XhTs
.. section: Library
code.interact now prints an message when exiting.
..
.. bpo: 6422
.. date: 9431
.. nonce: iBSc45
.. section: Library
Add autorange method to timeit.Timer objects.
..
.. bpo: 27773
.. date: 9430
.. nonce: hMSSeX
.. section: Library
Correct some memory management errors server_hostname in _ssl.wrap_socket().
..
.. bpo: 26750
.. date: 9429
.. nonce: OQn3fr
.. section: Library
unittest.mock.create_autospec() now works properly for subclasses of
property() and other data descriptors. Removes the never publicly used,
never documented unittest.mock.DescriptorTypes tuple.
..
.. bpo: 26754
.. date: 9428
.. nonce: XZqomf
.. section: Library
Undocumented support of general bytes-like objects as path in compile() and
similar functions is now deprecated.
..
.. bpo: 26800
.. date: 9427
.. nonce: QDcK8u
.. section: Library
Undocumented support of general bytes-like objects as paths in os functions
is now deprecated.
..
.. bpo: 26981
.. date: 9426
.. nonce: yhNTCf
.. section: Library
Add _order_ compatibility shim to enum.Enum for Python 2/3 code bases.
..
.. bpo: 27661
.. date: 9425
.. nonce: 3JZckO
.. section: Library
Added tzinfo keyword argument to datetime.combine.
..
.. bpo: 0
.. date: 9424
.. nonce: Ny9oPv
.. section: Library
In the curses module, raise an error if window.getstr() or window.instr() is
passed a negative value.
..
.. bpo: 27783
.. date: 9423
.. nonce: cR1jXH
.. section: Library
Fix possible usage of uninitialized memory in operator.methodcaller.
..
.. bpo: 27774
.. date: 9422
.. nonce: FDcik1
.. section: Library
Fix possible Py_DECREF on unowned object in _sre.
..
.. bpo: 27760
.. date: 9421
.. nonce: gxMjp4
.. section: Library
Fix possible integer overflow in binascii.b2a_qp.
..
.. bpo: 27758
.. date: 9420
.. nonce: 0NRV03
.. section: Library
Fix possible integer overflow in the _csv module for large record lengths.
..
.. bpo: 27568
.. date: 9419
.. nonce: OnuO9s
.. section: Library
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.
..
.. bpo: 7063
.. date: 9418
.. nonce: nXsVKB
.. section: Library
Remove dead code from the "array" module's slice handling. Patch by Chuck.
..
.. bpo: 27656
.. date: 9417
.. nonce: joTscM
.. section: Library
Do not assume sched.h defines any SCHED_* constants.
..
.. bpo: 27130
.. date: 9416
.. nonce: SUxwXZ
.. section: Library
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.
..
.. bpo: 24773
.. date: 9415
.. nonce: IDW05R
.. section: Library
Implemented PEP 495 (Local Time Disambiguation).
..
.. bpo: 0
.. date: 9414
.. nonce: lOkwM8
.. section: Library
Expose the EPOLLEXCLUSIVE constant (when it is defined) in the select
module.
..
.. bpo: 27567
.. date: 9413
.. nonce: bYOgyw
.. section: Library
Expose the EPOLLRDHUP and POLLRDHUP constants in the select module.
..
.. bpo: 1621
.. date: 9412
.. nonce: 0nclmI
.. section: Library
Avoid signed int negation overflow in the "audioop" module.
..
.. bpo: 27533
.. date: 9411
.. nonce: iDmKzV
.. section: Library
Release GIL in nt._isdir
..
.. bpo: 17711
.. date: 9410
.. nonce: 47AILJ
.. section: Library
Fixed unpickling by the persistent ID with protocol 0. Original patch by
Alexandre Vassalotti.
..
.. bpo: 27522
.. date: 9409
.. nonce: 8vVz_t
.. section: Library
Avoid an unintentional reference cycle in email.feedparser.
..
.. bpo: 27512
.. date: 9408
.. nonce: FaGwup
.. section: Library
Fix a segfault when os.fspath() called an __fspath__() method that raised an
exception. Patch by Xiang Zhang.
..
.. bpo: 27714
.. date: 9407
.. nonce: bUEDsI
.. section: IDLE
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.
..
.. bpo: 27621
.. date: 9406
.. nonce: BcpOPU
.. section: IDLE
Put query response validation error messages in the query box itself instead
of in a separate massagebox. Redo tests to match. Add Mac OSX refinements.
Original patch by Mark Roseman.
..
.. bpo: 27620
.. date: 9405
.. nonce: TXRR6x
.. section: IDLE
Escape key now closes Query box as cancelled.
..
.. bpo: 27609
.. date: 9404
.. nonce: MbTuKa
.. section: IDLE
IDLE: tab after initial whitespace should tab, not autocomplete. This fixes
problem with writing docstrings at least twice indented.
..
.. bpo: 27609
.. date: 9403
.. nonce: OBYgv_
.. section: IDLE
Explicitly return None when there are also non-None returns. In a few cases,
reverse a condition and eliminate a return.
..
.. bpo: 25507
.. date: 9402
.. nonce: lxf68d
.. section: IDLE
IDLE no longer runs buggy code because of its tkinter imports. Users must
include the same imports required to run directly in Python.
..
.. bpo: 27173
.. date: 9401
.. nonce: M-fYaV
.. section: IDLE
Add 'IDLE Modern Unix' to the built-in key sets. Make the default key set
depend on the platform. Add tests for the changes to the config module.
..
.. bpo: 27452
.. date: 9400
.. nonce: RtWnyR
.. section: IDLE
add line counter and crc to IDLE configHandler test dump.
..
.. bpo: 25805
.. date: 9399
.. nonce: 9SVxXQ
.. section: Tests
Skip a test in test_pkgutil as needed that doesn't work when ``__name__ ==
__main__``. Patch by SilentGhost.
..
.. bpo: 27472
.. date: 9398
.. nonce: NS3L93
.. section: Tests
Add test.support.unix_shell as the path to the default shell.
..
.. bpo: 27369
.. date: 9397
.. nonce: LG7U2D
.. section: Tests
In test_pyexpat, avoid testing an error message detail that changed in Expat
2.2.0.
..
.. bpo: 27594
.. date: 9396
.. nonce: w3F57B
.. section: Tests
Prevent assertion error when running test_ast with coverage enabled: ensure
code object has a valid first line number. Patch suggested by Ivan
Levkivskyi.
..
.. bpo: 27647
.. date: 9395
.. nonce: -1HUR6
.. section: Windows
Update bundled Tcl/Tk to 8.6.6.
..
.. bpo: 27610
.. date: 9394
.. nonce: O0o0mB
.. section: Windows
Adds PEP 514 metadata to Windows installer
..
.. bpo: 27469
.. date: 9393
.. nonce: 0GwDkX
.. section: Windows
Adds a shell extension to the launcher so that drag and drop works
correctly.
..
.. bpo: 27309
.. date: 9392
.. nonce: chiOo6
.. section: Windows
Enables proper Windows styles in python[w].exe manifest.
..
.. bpo: 27713
.. date: 9391
.. nonce: _3DgXG
.. section: Build
Suppress spurious build warnings when updating importlib's bootstrap files.
Patch by Xiang Zhang
..
.. bpo: 25825
.. date: 9390
.. nonce: MLbdVU
.. section: Build
Correct the references to Modules/python.exp, which is required on AIX. The
references were accidentally changed in 3.5.0a1.
..
.. bpo: 27453
.. date: 9389
.. nonce: Pb5DBi
.. section: Build
CPP invocation in configure must use CPPFLAGS. Patch by Chi Hsuan Yen.
..
.. bpo: 27641
.. date: 9388
.. nonce: eGzgCk
.. section: Build
The configure script now inserts comments into the makefile to prevent the
pgen and _freeze_importlib executables from being cross- compiled.
..
.. bpo: 26662
.. date: 9387
.. nonce: XkwRxM
.. section: Build
Set PYTHON_FOR_GEN in configure as the Python program to be used for file
generation during the build.
..
.. bpo: 10910
.. date: 9386
.. nonce: ZdRayb
.. section: Build
Avoid C++ compilation errors on FreeBSD and OS X. Also update FreedBSD
version checks for the original ctype UTF-8 workaround.