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diff --git a/Misc/NEWS.d/3.9.0b1.rst b/Misc/NEWS.d/3.9.0b1.rst new file mode 100644 index 00000000000..25dd405c130 --- /dev/null +++ b/Misc/NEWS.d/3.9.0b1.rst @@ -0,0 +1,960 @@ +.. bpo: 40501 +.. date: 2020-05-06-00-41-11 +.. nonce: _61wv_ +.. release date: 2020-05-19 +.. section: Security + +:mod:`uuid` no longer uses :mod:`ctypes` to load :file:`libuuid` or +:file:`rpcrt4.dll` at runtime. + +.. + +.. bpo: 40663 +.. date: 2020-05-17-20-38-12 +.. nonce: u2aiZf +.. section: Core and Builtins + +Correctly generate annotations where parentheses are omitted but required +(e.g: ``Type[(str, int, *other))]``. + +.. + +.. bpo: 40596 +.. date: 2020-05-11-20-53-52 +.. nonce: dwOH_X +.. section: Core and Builtins + +Fixed :meth:`str.isidentifier` for non-canonicalized strings containing +non-BMP characters on Windows. + +.. + +.. bpo: 40593 +.. date: 2020-05-11-13-50-52 +.. nonce: yuOXj3 +.. section: Core and Builtins + +Improved syntax errors for invalid characters in source code. + +.. + +.. bpo: 40585 +.. date: 2020-05-11-00-19-42 +.. nonce: yusknY +.. section: Core and Builtins + +Fixed a bug when using :func:`codeop.compile_command` that was causing +exceptions to be swallowed with the new parser. Patch by Pablo Galindo + +.. + +.. bpo: 40566 +.. date: 2020-05-09-01-39-16 +.. nonce: wlcjW_ +.. section: Core and Builtins + +Apply :pep:`573` to :mod:`abc`. + +.. + +.. bpo: 40502 +.. date: 2020-05-08-03-25-26 +.. nonce: e-VCyL +.. section: Core and Builtins + +Initialize ``n->n_col_offset``. (Patch by Joannah Nanjekye) + +.. + +.. bpo: 40527 +.. date: 2020-05-06-14-52-35 +.. nonce: gTNKuy +.. section: Core and Builtins + +Fix command line argument parsing: no longer write errors multiple times +into stderr. + +.. + +.. bpo: 1635741 +.. date: 2020-05-05-21-11-35 +.. nonce: ggwD3C +.. section: Core and Builtins + +Port :mod:`errno` to multiphase initialization (:pep:`489`). + +.. + +.. bpo: 40523 +.. date: 2020-05-05-20-36-15 +.. nonce: hKZVTB +.. section: Core and Builtins + +Add pass-throughs for :func:`hash` and :func:`reversed` to +:class:`weakref.proxy` objects. Patch by Pablo Galindo. + +.. + +.. bpo: 1635741 +.. date: 2020-05-05-03-36-27 +.. nonce: ARv1YV +.. section: Core and Builtins + +Port :mod:`syslog` to multiphase initialization (:pep:`489`). + +.. + +.. bpo: 40246 +.. date: 2020-05-03-23-28-11 +.. nonce: c1D7x8 +.. section: Core and Builtins + +Reporting a specialised error message for invalid string prefixes, which was +introduced in :issue:`40246`, is being reverted due to backwards +compatibility concerns for strings that immediately follow a reserved +keyword without whitespace between them. Constructs like `bg="#d00" if clear +else"#fca"` were failing to parse, which is not an acceptable breakage on +such short notice. + +.. + +.. bpo: 40417 +.. date: 2020-05-01-19-04-52 +.. nonce: Sti2lJ +.. section: Core and Builtins + +Fix imp module deprecation warning when PyImport_ReloadModule is called. +Patch by Robert Rouhani. + +.. + +.. bpo: 40408 +.. date: 2020-05-01-15-36-14 +.. nonce: XzQI59 +.. section: Core and Builtins + +Fixed support of nested type variables in GenericAlias (e.g. +``list[list[T]]``). + +.. + +.. bpo: 1635741 +.. date: 2020-04-30-01-44-42 +.. nonce: GKtjqr +.. section: Core and Builtins + +Port _stat module to multiphase initialization (:pep:`489`). + +.. + +.. bpo: 29587 +.. date: 2020-04-30-00-50-25 +.. nonce: oEwSq +.. section: Core and Builtins + +Enable implicit exception chaining when calling :meth:`generator.throw`. + +.. + +.. bpo: 40328 +.. date: 2020-04-19-22-23-32 +.. nonce: gWJ53f +.. section: Core and Builtins + +Add tools for generating mappings headers for CJKCodecs. + +.. + +.. bpo: 40228 +.. date: 2020-04-08-17-02-35 +.. nonce: bRaaJ- +.. section: Core and Builtins + +Setting frame.f_lineno is now robust w.r.t. changes in the +source-to-bytecode compiler + +.. + +.. bpo: 38880 +.. date: 2019-11-22-14-34-47 +.. nonce: evcCPa +.. section: Core and Builtins + +Added the ability to list interpreters associated with channel ends in the +internal subinterpreters module. + +.. + +.. bpo: 37986 +.. date: 2019-11-20-09-50-58 +.. nonce: o0lmA7 +.. section: Core and Builtins + +Improve performance of :c:func:`PyLong_FromDouble` for values that fit into +:c:type:`long`. + +.. + +.. bpo: 40662 +.. date: 2020-05-18-12-56-45 +.. nonce: dfornR +.. section: Library + +Fixed :func:`ast.get_source_segment` for ast nodes that have incomplete +location information. Patch by Irit Katriel. + +.. + +.. bpo: 40665 +.. date: 2020-05-17-21-56-38 +.. nonce: msB7u5 +.. section: Library + +Convert :mod:`bisect` to use Argument Clinic. + +.. + +.. bpo: 40536 +.. date: 2020-05-17-14-00-12 +.. nonce: FCpoRA +.. section: Library + +Added the :func:`~zoneinfo.available_timezones` function to the +:mod:`zoneinfo` module. Patch by Paul Ganssle. + +.. + +.. bpo: 40645 +.. date: 2020-05-16-19-34-38 +.. nonce: 7ibMt- +.. section: Library + +The :class:`hmac.HMAC` exposes internal implementation details. The +attributes ``digest_cons``, ``inner``, and ``outer`` are deprecated and will +be removed in the future. + +.. + +.. bpo: 40645 +.. date: 2020-05-16-17-05-02 +.. nonce: wYSkjT +.. section: Library + +The internal module ``_hashlib`` wraps and exposes OpenSSL's HMAC API. The +new code will be used in Python 3.10 after the internal implementation +details of the pure Python HMAC module are no longer part of the public API. + +.. + +.. bpo: 40637 +.. date: 2020-05-15-21-57-10 +.. nonce: lb3Bnp +.. section: Library + +Builtin hash modules can now be disabled or selectively enabled with +``configure --with-builtin-hashlib-hashes=sha3,blake1`` or +``--without-builtin-hashlib-hashes``. + +.. + +.. bpo: 37630 +.. date: 2020-05-15-19-53-18 +.. nonce: O5kgAw +.. section: Library + +The :mod:`hashlib` module can now use SHA3 hashes and SHAKE XOF from OpenSSL +when available. + +.. + +.. bpo: 40479 +.. date: 2020-05-15-17-38-21 +.. nonce: yamSCh +.. section: Library + +The :mod:`hashlib` now compiles with OpenSSL 3.0.0-alpha2. + +.. + +.. bpo: 40257 +.. date: 2020-05-13-23-10-25 +.. nonce: aR4TGp +.. section: Library + +Revert changes to :func:`inspect.getdoc`. + +.. + +.. bpo: 40607 +.. date: 2020-05-13-15-32-13 +.. nonce: uSPFCi +.. section: Library + +When cancelling a task due to timeout, :meth:`asyncio.wait_for` will now +propagate the exception if an error happens during cancellation. Patch by +Roman Skurikhin. + +.. + +.. bpo: 40612 +.. date: 2020-05-13-10-23-29 +.. nonce: gOIreM +.. section: Library + +Fix edge cases in SyntaxError formatting. If the offset is <= 0, no caret is +printed. If the offset is > line length, the caret is printed pointing just +after the last character. + +.. + +.. bpo: 40597 +.. date: 2020-05-11-19-17-23 +.. nonce: 4SGfgm +.. section: Library + +If text content lines are longer than policy.max_line_length, always use a +content-encoding to make sure they are wrapped. + +.. + +.. bpo: 40571 +.. date: 2020-05-09-15-38-25 +.. nonce: kOXZGC +.. section: Library + +Added functools.cache() as a simpler, more discoverable way to access the +unbounded cache variant of lru_cache(maxsize=None). + +.. + +.. bpo: 40503 +.. date: 2020-05-08-15-48-39 +.. nonce: elZyxc +.. section: Library + +:pep:`615`, the :mod:`zoneinfo` module. Adds support for the IANA time zone +database. + +.. + +.. bpo: 40397 +.. date: 2020-05-07-21-22-04 +.. nonce: PVWFAn +.. section: Library + +Removed attributes ``__args__`` and ``__parameters__`` from special generic +aliases like ``typing.List`` (not subscripted). + +.. + +.. bpo: 40549 +.. date: 2020-05-07-20-11-51 +.. nonce: 6FiRSV +.. section: Library + +Convert posixmodule.c ("posix" or "nt" module) to the multiphase +initialization (PEP 489). + +.. + +.. bpo: 31033 +.. date: 2020-05-07-06-41-20 +.. nonce: waCj3n +.. section: Library + +Add a ``msg`` argument to :meth:`Future.cancel` and :meth:`Task.cancel`. + +.. + +.. bpo: 40541 +.. date: 2020-05-06-15-36-47 +.. nonce: LlYghL +.. section: Library + +Added an optional *counts* parameter to random.sample(). + +.. + +.. bpo: 40515 +.. date: 2020-05-06-13-51-19 +.. nonce: TUCvYB +.. section: Library + +The :mod:`ssl` and :mod:`hashlib` modules now actively check that OpenSSL is +build with thread support. Python 3.7.0 made thread support mandatory and no +longer works safely with a no-thread builds. + +.. + +.. bpo: 31033 +.. date: 2020-05-06-02-33-00 +.. nonce: aX12pw +.. section: Library + +When a :class:`asyncio.Task` is cancelled, the exception traceback now +chains all the way back to where the task was first interrupted. + +.. + +.. bpo: 40504 +.. date: 2020-05-05-17-12-47 +.. nonce: EX6wPn +.. section: Library + +:func:`functools.lru_cache` objects can now be the targets of weakrefs. + +.. + +.. bpo: 40559 +.. date: 2020-05-05-08-12-51 +.. nonce: 112wwa +.. section: Library + +Fix possible memory leak in the C implementation of :class:`asyncio.Task`. + +.. + +.. bpo: 40480 +.. date: 2020-05-04-21-21-43 +.. nonce: mjldWa +.. section: Library + +``fnmatch.fnmatch()`` could take exponential time in the presence of +multiple ``*`` pattern characters. This was repaired by generating more +elaborate regular expressions to avoid futile backtracking. + +.. + +.. bpo: 40495 +.. date: 2020-05-04-11-20-49 +.. nonce: TyTc2O +.. section: Library + +:mod:`compileall` is now able to use hardlinks to prevent duplicates in a +case when ``.pyc`` files for different optimization levels have the same +content. + +.. + +.. bpo: 40457 +.. date: 2020-05-02-17-17-37 +.. nonce: EXReI1 +.. section: Library + +The ssl module now support OpenSSL builds without TLS 1.0 and 1.1 methods. + +.. + +.. bpo: 40355 +.. date: 2020-05-02-14-24-48 +.. nonce: xTujaB +.. section: Library + +Improve error reporting in :func:`ast.literal_eval` in the presence of +malformed :class:`ast.Dict` nodes instead of silently ignoring any +non-conforming elements. Patch by Curtis Bucher. + +.. + +.. bpo: 40465 +.. date: 2020-05-02-12-00-28 +.. nonce: qfCjOD +.. section: Library + +Deprecated the optional *random* argument to *random.shuffle()*. + +.. + +.. bpo: 40459 +.. date: 2020-05-02-04-29-31 +.. nonce: fSAYVD +.. section: Library + +:func:`platform.win32_ver` now produces correct *ptype* strings instead of +empty strings. + +.. + +.. bpo: 39435 +.. date: 2020-05-01-23-24-25 +.. nonce: mgb6ib +.. section: Library + +The first argument of :func:`pickle.loads` is now positional-only. + +.. + +.. bpo: 39305 +.. date: 2020-05-01-00-22-58 +.. nonce: Cuwu_H +.. section: Library + +Update :mod:`nntplib` to merge :class:`nntplib.NNTP` and +:class:`nntplib._NNTPBase`. Patch by Dong-hee Na. + +.. + +.. bpo: 32494 +.. date: 2020-04-30-22-25-08 +.. nonce: 1xaU5l +.. section: Library + +Update :mod:`dbm.gnu` to use gdbm_count if possible when calling +:func:`len`. Patch by Dong-hee Na. + +.. + +.. bpo: 40453 +.. date: 2020-04-30-22-04-58 +.. nonce: ggz7sl +.. section: Library + +Add ``isolated=True`` keyword-only parameter to +``_xxsubinterpreters.create()``. An isolated subinterpreter cannot spawn +threads, spawn a child process or call ``os.fork()``. + +.. + +.. bpo: 40286 +.. date: 2020-04-29-18-02-16 +.. nonce: txbQNx +.. section: Library + +Remove ``_random.Random.randbytes()``: the C implementation of +``randbytes()``. Implement the method in Python to ease subclassing: +``randbytes()`` now directly reuses ``getrandbits()``. + +.. + +.. bpo: 40394 +.. date: 2020-04-28-18-59-48 +.. nonce: Yi5uuM +.. section: Library + +Added default arguments to +:meth:`difflib.SequenceMatcher.find_longest_match()`. + +.. + +.. bpo: 39995 +.. date: 2020-04-28-18-25-27 +.. nonce: WmA3Gk +.. section: Library + +Fix a race condition in concurrent.futures._ThreadWakeup: access to +_ThreadWakeup is now protected with the shutdown lock. + +.. + +.. bpo: 30966 +.. date: 2020-04-27-20-27-39 +.. nonce: Xmtlqu +.. section: Library + +``Process.shutdown(wait=True)`` of :mod:`concurrent.futures` now closes +explicitly the result queue. + +.. + +.. bpo: 30966 +.. date: 2020-04-27-17-19-09 +.. nonce: _5lDx- +.. section: Library + +Add a new :meth:`~multiprocessing.SimpleQueue.close` method to the +:class:`~multiprocessing.SimpleQueue` class to explicitly close the queue. + +.. + +.. bpo: 39966 +.. date: 2020-04-27-14-48-43 +.. nonce: N5yXUe +.. section: Library + +Revert bpo-25597. :class:`unittest.mock.MagicMock` with wraps' set uses +default return values for magic methods. + +.. + +.. bpo: 39791 +.. date: 2020-04-27-00-51-40 +.. nonce: wv8Dxn +.. section: Library + +Added ``files()`` function to importlib.resources with support for +subdirectories in package data, matching backport in importlib_resources +1.5. + +.. + +.. bpo: 40375 +.. date: 2020-04-25-23-14-11 +.. nonce: 5GuK2A +.. section: Library + +:meth:`imaplib.IMAP4.unselect` is added. Patch by Dong-hee Na. + +.. + +.. bpo: 40389 +.. date: 2020-04-25-20-00-58 +.. nonce: FPA6f0 +.. section: Library + +``repr()`` now returns ``typing.Optional[T]`` when called for +``typing.Union`` of two types, one of which is ``NoneType``. + +.. + +.. bpo: 40291 +.. date: 2020-04-14-22-31-27 +.. nonce: _O8hXn +.. section: Library + +Add support for CAN_J1939 sockets (available on Linux 5.4+) + +.. + +.. bpo: 40273 +.. date: 2020-04-14-09-54-35 +.. nonce: IN73Ks +.. section: Library + +:class:`types.MappingProxyType` is now reversible. + +.. + +.. bpo: 39075 +.. date: 2020-04-07-23-44-06 +.. nonce: hgck3j +.. section: Library + +The repr for :class:`types.SimpleNamespace` is now insertion ordered rather +than alphabetical. + +.. + +.. bpo: 40192 +.. date: 2020-04-05-04-16-14 +.. nonce: nk8uRJ +.. section: Library + +On AIX, :func:`~time.thread_time` is now implemented with +``thread_cputime()`` which has nanosecond resolution, rather than +``clock_gettime(CLOCK_THREAD_CPUTIME_ID)`` which has a resolution of 10 ms. +Patch by Batuhan Taskaya. + +.. + +.. bpo: 40025 +.. date: 2020-03-21-05-26-38 +.. nonce: DTLtyq +.. section: Library + +Raise TypeError when _generate_next_value_ is defined after members. Patch +by Ethan Onstott. + +.. + +.. bpo: 39058 +.. date: 2019-12-15-19-17-10 +.. nonce: 7ci-vd +.. section: Library + +In the argparse module, the repr for Namespace() and other argument holders +now displayed in the order attributes were added. Formerly, it displayed in +alphabetical order even though argument order is preserved the user visible +parts of the module. + +.. + +.. bpo: 24416 +.. date: 2019-09-01-15-17-49 +.. nonce: G8Ww1U +.. section: Library + +The ``isocalendar()`` methods of :class:`datetime.date` and +:class:`datetime.datetime` now return a :term:`named tuple` instead of a +:class:`tuple`. + +.. + +.. bpo: 34790 +.. date: 2020-05-08-20-18-55 +.. nonce: t6kW_1 +.. section: Documentation + +Add version of removal for explicit passing of coros to `asyncio.wait()`'s +documentation + +.. + +.. bpo: 40561 +.. date: 2020-05-08-08-39-40 +.. nonce: ZMB_2i +.. section: Documentation + +Provide docstrings for webbrowser open functions. + +.. + +.. bpo: 40499 +.. date: 2020-05-04-14-20-02 +.. nonce: tjLSo8 +.. section: Documentation + +Mention that :func:`asyncio.wait` requires a non-empty set of awaitables. + +.. + +.. bpo: 39705 +.. date: 2020-03-14-18-37-06 +.. nonce: nQVqig +.. section: Documentation + +Tutorial example for sorted() in the Loop Techniques section is given a +better explanation. Also a new example is included to explain sorted()'s +basic behavior. + +.. + +.. bpo: 39435 +.. date: 2020-01-24-05-42-57 +.. nonce: EFcdFU +.. section: Documentation + +Fix an incorrect signature for :func:`pickle.loads` in the docs + +.. + +.. bpo: 40055 +.. date: 2020-05-15-01-21-44 +.. nonce: Xp4aP9 +.. section: Tests + +distutils.tests now saves/restores warnings filters to leave them unchanged. +Importing tests imports docutils which imports pkg_resources which adds a +warnings filter. + +.. + +.. bpo: 40436 +.. date: 2020-04-29-16-08-24 +.. nonce: gDMnYl +.. section: Tests + +test_gdb and test.pythoninfo now check gdb command exit code. + +.. + +.. bpo: 40653 +.. date: 2020-05-17-03-33-00 +.. nonce: WI8UGn +.. section: Build + +Move _dirnameW out of HAVE_SYMLINK to fix a potential compiling issue. + +.. + +.. bpo: 40514 +.. date: 2020-05-05-15-39-11 +.. nonce: bZZmuS +.. section: Build + +Add ``--with-experimental-isolated-subinterpreters`` build option to +``configure``: better isolate subinterpreters, experimental build mode. + +.. + +.. bpo: 40650 +.. date: 2020-05-17-00-08-13 +.. nonce: 4euMtU +.. section: Windows + +Include winsock2.h in pytime.c for timeval. + +.. + +.. bpo: 40458 +.. date: 2020-05-01-20-57-57 +.. nonce: Eb0ueI +.. section: Windows + +Increase reserved stack space to prevent overflow crash on Windows. + +.. + +.. bpo: 39148 +.. date: 2020-03-23-19-07-55 +.. nonce: W1YJEb +.. section: Windows + +Add IPv6 support to :mod:`asyncio` datagram endpoints in ProactorEventLoop. +Change the raised exception for unknown address families to ValueError as +it's not coming from Windows API. + +.. + +.. bpo: 34956 +.. date: 2020-05-18-02-43-11 +.. nonce: 35IcGF +.. section: macOS + +_tkinter now builds and links with non-system Tcl and Tk frameworks if they +are installed in /Library/Frameworks as had been the case on older releases +of macOS. If a macOS SDK is explicitly configured, by using ./configure +--enable-universalsdk= or -isysroot, only a Library/Frameworks directory in +the SDK itself is searched. The default behavior can still be overridden +with configure --with-tcltk-includes and --with-tcltk-libs. + +.. + +.. bpo: 35569 +.. date: 2020-04-15-00-02-47 +.. nonce: 02_1MV +.. section: macOS + +Expose RFC 3542 IPv6 socket options. + +.. + +.. bpo: 40479 +.. date: 2020-05-15-17-48-25 +.. nonce: B1gBl- +.. section: Tools/Demos + +Update multissltest helper to test with latest OpenSSL 1.0.2, 1.1.0, 1.1.1, +and 3.0.0-alpha. + +.. + +.. bpo: 40431 +.. date: 2020-04-29-01-32-17 +.. nonce: B_aEZ0 +.. section: Tools/Demos + +Fix a syntax typo in ``turtledemo`` that now raises a ``SyntaxError``. + +.. + +.. bpo: 40163 +.. date: 2020-04-03-08-32-31 +.. nonce: lX8K4B +.. section: Tools/Demos + +Fix multissltest tool. OpenSSL has changed download URL for old releases. +The multissltest tool now tries to download from current and old download +URLs. + +.. + +.. bpo: 39465 +.. date: 2020-05-14-00-36-19 +.. nonce: 3a5g-X +.. section: C API + +Remove the ``_PyUnicode_ClearStaticStrings()`` function from the C API. + +.. + +.. bpo: 38787 +.. date: 2020-05-10-16-39-08 +.. nonce: XzQ59O +.. section: C API + +Add PyCFunction_CheckExact() macro for exact type checks now that we allow +subtypes of PyCFunction, as well as PyCMethod_CheckExact() and +PyCMethod_Check() for the new PyCMethod subtype. + +.. + +.. bpo: 40545 +.. date: 2020-05-07-11-41-13 +.. nonce: 51DzF1 +.. section: C API + +Declare ``_PyErr_GetTopmostException()`` with ``PyAPI_FUNC()`` to properly +export the function in the C API. The function remains private (``_Py``) +prefix. + +.. + +.. bpo: 40412 +.. date: 2020-05-01-17-28-04 +.. nonce: dE0D8N +.. section: C API + +Nullify inittab_copy during finalization, preventing future interpreter +initializations in an embedded situation from crashing. Patch by Gregory +Szorc. + +.. + +.. bpo: 40429 +.. date: 2020-04-29-01-39-41 +.. nonce: VQfvta +.. section: C API + +The :c:func:`PyThreadState_GetFrame` function now returns a strong reference +to the frame. + +.. + +.. bpo: 40428 +.. date: 2020-04-28-23-17-27 +.. nonce: rmtpru +.. section: C API + +Remove the following functions from the C API. Call :c:func:`PyGC_Collect` +explicitly to free all free lists. + +* ``PyAsyncGen_ClearFreeLists()`` +* ``PyContext_ClearFreeList()`` +* ``PyDict_ClearFreeList()`` +* ``PyFloat_ClearFreeList()`` +* ``PyFrame_ClearFreeList()`` +* ``PyList_ClearFreeList()`` +* ``PySet_ClearFreeList()`` +* ``PyTuple_ClearFreeList()`` + +.. + +.. bpo: 40421 +.. date: 2020-04-28-19-29-36 +.. nonce: 3uIIaB +.. section: C API + +New :c:func:`PyFrame_GetBack` function: get the frame next outer frame. + +.. + +.. bpo: 40421 +.. date: 2020-04-28-15-47-58 +.. nonce: ZIzOV0 +.. section: C API + +New :c:func:`PyFrame_GetCode` function: return a borrowed reference to the +frame code. + +.. + +.. bpo: 40217 +.. date: 2020-04-27-14-00-38 +.. nonce: sgn6c8 +.. section: C API + +Ensure that instances of types created with +:c:func:`PyType_FromSpecWithBases` will visit its class object when +traversing references in the garbage collector (implemented as an extension +of the provided :c:member:`~PyTypeObject.tp_traverse`). Patch by Pablo +Galindo. + +.. + +.. bpo: 38787 +.. date: 2020-01-22-12-38-59 +.. nonce: HUH6hd +.. section: C API + +Module C state is now accessible from C-defined heap type methods +(:pep:`573`). Patch by Marcel Plch and Petr Viktorin. |