Python 3.8.0b1

Doc/tools/extensions/pyspecific.py

@@ -36,7 +36,7 @@ import suspicious
 
 
 ISSUE_URI = 'https://bugs.python.org/issue%s'
-SOURCE_URI = 'https://github.com/python/cpython/tree/master/%s'
+SOURCE_URI = 'https://github.com/python/cpython/tree/3.8/%s'
 
 # monkey-patch reST parser to disable alphabetic and roman enumerated lists
 from docutils.parsers.rst.states import Body

Include/patchlevel.h

@@ -19,11 +19,11 @@
 #define PY_MAJOR_VERSION        3
 #define PY_MINOR_VERSION        8
 #define PY_MICRO_VERSION        0
-#define PY_RELEASE_LEVEL        PY_RELEASE_LEVEL_ALPHA
-#define PY_RELEASE_SERIAL       4
+#define PY_RELEASE_LEVEL        PY_RELEASE_LEVEL_BETA
+#define PY_RELEASE_SERIAL       1
 
 /* Version as a string */
-#define PY_VERSION              "3.8.0a4+"
+#define PY_VERSION              "3.8.0b1"
 /*--end constants--*/
 
 /* Version as a single 4-byte hex number, e.g. 0x010502B2 == 1.5.2b2.

Misc/NEWS.d/next/Build/2019-05-03-21-08-06.bpo-36786.gOLFbD.rst

-"make install" now runs compileall in parallel.

Misc/NEWS.d/next/Build/2019-05-22-16-19-18.bpo-36721.9aRwfZ.rst

-To embed Python into an application, a new ``--embed`` option must be passed to
-``python3-config --libs --embed`` to get ``-lpython3.8`` (link the application
-to libpython). To support both 3.8 and older, try ``python3-config --libs
---embed`` first and fallback to ``python3-config --libs`` (without ``--embed``)
-if the previous command fails.
-
-Add a pkg-config ``python-3.8-embed`` module to embed Python into an
-application: ``pkg-config python-3.8-embed --libs`` includes ``-lpython3.8``.
-To support both 3.8 and older, try ``pkg-config python-X.Y-embed --libs`` first
-and fallback to ``pkg-config python-X.Y --libs`` (without ``--embed``) if the
-previous command fails (replace ``X.Y`` with the Python version).
-
-On the other hand, ``pkg-config python3.8 --libs`` no longer contains
-``-lpython3.8``. C extensions must not be linked to libpython (except on
-Android, case handled by the script); this change is backward incompatible on
-purpose.

Misc/NEWS.d/next/C API/2019-05-11-03-56-23.bpo-36728.FR-dMP.rst

-The :c:func:`PyEval_ReInitThreads` function has been removed from the C API.
-It should not be called explicitly: use :c:func:`PyOS_AfterFork_Child` instead.

Misc/NEWS.d/next/C API/2019-05-15-10-46-55.bpo-36922.J3EFK_.rst

-Add new type flag ``Py_TPFLAGS_METHOD_DESCRIPTOR`` for objects behaving like
-unbound methods. These are objects supporting the optimization given by the
-``LOAD_METHOD``/``CALL_METHOD`` opcodes. See PEP 590.

Misc/NEWS.d/next/C API/2019-05-17-19-23-24.bpo-36763.TswmDy.rst

-``Py_Main()`` now returns the exitcode rather than calling
-``Py_Exit(exitcode)`` when calling ``PyErr_Print()`` if the current
-exception type is ``SystemExit``.

Misc/NEWS.d/next/C API/2019-05-22-15-24-08.bpo-36974.TkySRe.rst

-Implement :pep:`590`: Vectorcall: a fast calling protocol for CPython.
-This is a new protocol to optimize calls of custom callable objects.

Misc/NEWS.d/next/C API/2019-05-22-17-33-52.bpo-37107.8BVPR-.rst

-Update :c:func:`PyObject_CallMethodObjArgs` and ``_PyObject_CallMethodIdObjArgs``
-to use ``_PyObject_GetMethod`` to avoid creating a bound method object in many
-cases.
-Patch by Michael J. Sullivan.

Misc/NEWS.d/next/C API/2019-05-24-07-11-08.bpo-36379.8zgoKe.rst

-Fix crashes when attempting to use the *modulo* parameter when ``__ipow__``
-is implemented in C.

Misc/NEWS.d/next/C API/2019-05-27-12-25-25.bpo-36763.bHCA9j.rst

-Implement the :pep:`587` "Python Initialization Configuration".

Misc/NEWS.d/next/Core and Builtins/2017-10-24-17-26-58.bpo-31862.5Gea8L.rst

-Port binascii to PEP 489 multiphase initialization.
-Patch by Marcel Plch.

Misc/NEWS.d/next/Core and Builtins/2017-12-21-20-37-40.bpo-32388.6w-i5t.rst

-Remove cross-version binary compatibility requirement in tp_flags.

Misc/NEWS.d/next/Core and Builtins/2018-05-30-23-43-03.bpo-26826.NkRzjb.rst

-Expose :func:`copy_file_range` as a low level API in the :mod:`os` module.

Misc/NEWS.d/next/Core and Builtins/2018-07-04-16-57-59.bpo-20602.sDLElw.rst

-Do not clear :data:`sys.flags` and :data:`sys.float_info` during shutdown.
-Patch by Zackery Spytz.

Misc/NEWS.d/next/Core and Builtins/2019-02-13-16-47-19.bpo-35983.bNxsXv.rst

-Added new trashcan macros to deal with a double deallocation that could occur
-when the `tp_dealloc` of a subclass calls the `tp_dealloc` of a base class
-and that base class uses the trashcan mechanism. Patch by Jeroen Demeyer.

Misc/NEWS.d/next/Core and Builtins/2019-02-22-14-30-19.bpo-36035.-6dy1y.rst

-Added fix for broken symlinks in combination with pathlib
\ No newline at end of file

Misc/NEWS.d/next/Core and Builtins/2019-02-22-23-03-20.bpo-36084.86Eh4X.rst

-Add native thread ID (TID) to threading.Thread objects (supported platforms: Windows, FreeBSD, Linux, macOS)
\ No newline at end of file

Misc/NEWS.d/next/Core and Builtins/2019-02-24-12-44-46.bpo-36045.RO20OV.rst

-builtins.help() now prefixes `async` for async functions

Misc/NEWS.d/next/Core and Builtins/2019-04-10-18-12-11.bpo-36594.fbnJAc.rst

-Fix incorrect use of ``%p`` in format strings.
-Patch by Zackery Spytz.

Misc/NEWS.d/next/Core and Builtins/2019-04-13-16-14-16.bpo-36601.mIgS7t.rst

-A long-since-meaningless check for ``getpid() == main_pid`` was removed
-from Python's internal C signal handler.

Misc/NEWS.d/next/Core and Builtins/2019-04-16-11-52-21.bpo-27987.n2_DcQ.rst

-pymalloc returns memory blocks aligned by 16 bytes, instead of 8 bytes, on
-64-bit platforms to conform x86-64 ABI. Recent compilers assume this alignment
-more often. Patch by Inada Naoki.

Misc/NEWS.d/next/Core and Builtins/2019-04-29-03-27-22.bpo-24048.vXxUDQ.rst

-Save the live exception during import.c's ``remove_module()``.

Misc/NEWS.d/next/Core and Builtins/2019-05-02-11-48-08.bpo-36774.ZqbJ1J.rst

-Add a ``=`` feature f-strings for debugging. This can precede ``!s``,
-``!r``, or ``!a``. It produces the text of the expression, followed by
-an equal sign, followed by the repr of the value of the expression. So
-``f'{3*9+15=}'`` would be equal to the string ``'3*9+15=42'``.  If
-``=`` is specified, the default conversion is set to ``!r``, unless a
-format spec is given, in which case the formatting behavior is
-unchanged, and __format__ will be used.

Misc/NEWS.d/next/Core and Builtins/2019-05-04-16-15-33.bpo-36793.Izog4Z.rst

-Removed ``__str__`` implementations from builtin types :class:`bool`,
-:class:`int`, :class:`float`, :class:`complex` and few classes from the
-standard library. They now inherit ``__str__()`` from :class:`object`.

Misc/NEWS.d/next/Core and Builtins/2019-05-07-12-18-11.bpo-36737.XAo6LY.rst

-Move PyRuntimeState.warnings into per-interpreter state (via "module
-state").

Misc/NEWS.d/next/Core and Builtins/2019-05-07-15-49-17.bpo-27639.b1Ah87.rst

-Correct return type for UserList slicing operations. Patch by Michael Blahay,
-Erick Cervantes, and vaultah

Misc/NEWS.d/next/Core and Builtins/2019-05-07-16-50-12.bpo-36842.NYww_N.rst

-Implement PEP 578, adding sys.audit, io.open_code and related APIs.

Misc/NEWS.d/next/Core and Builtins/2019-05-07-17-12-37.bpo-34616.0Y0_9r.rst

-The ``compile()`` builtin functions now support the ``ast.PyCF_ALLOW_TOP_LEVEL_AWAIT`` flag,  which allow to compile sources that  contains top-level ``await``, ``async with`` or ``async for``. This is useful to evaluate async-code from with an already async functions; for example in a custom REPL.
\ No newline at end of file

Misc/NEWS.d/next/Core and Builtins/2019-05-08-11-42-06.bpo-36851.J7DiCW.rst

-The ``FrameType`` stack is now correctly cleaned up if the execution ends
-with a return and the stack is not empty.

Misc/NEWS.d/next/Core and Builtins/2019-05-08-16-36-51.bpo-28866.qCv_bj.rst

-Avoid caching attributes of classes which type defines mro() to avoid a hard
-cache invalidation problem.

Misc/NEWS.d/next/Core and Builtins/2019-05-08-20-42-40.bpo-36861.72mvZM.rst

-Update the Unicode database to version 12.1.0.

Misc/NEWS.d/next/Core and Builtins/2019-05-12-18-46-50.bpo-36027.Q4YatQ.rst

-Allow computation of modular inverses via three-argument ``pow``: the second
-argument is now permitted to be negative in the case where the first and
-third arguments are relatively prime.

Misc/NEWS.d/next/Core and Builtins/2019-05-15-01-29-29.bpo-1875.9oxXFX.rst

-A :exc:`SyntaxError` is now raised if a code blocks that will be optimized
-away (e.g. if conditions that are always false) contains syntax errors.
-Patch by Pablo Galindo.

Misc/NEWS.d/next/Core and Builtins/2019-05-15-14-01-09.bpo-36826.GLrO3W.rst

-Add NamedExpression kind support to ast_unparse.c

Misc/NEWS.d/next/Core and Builtins/2019-05-16-23-53-45.bpo-36946.qjxr0Y.rst

-Fix possible signed integer overflow when handling slices.

Misc/NEWS.d/next/Core and Builtins/2019-05-17-12-28-24.bpo-36907.rk7kgp.rst

-Fix a crash when calling a C function with a keyword dict (``f(**kwargs)``)
-and changing the dict ``kwargs`` while that function is running.

Misc/NEWS.d/next/Core and Builtins/2019-05-17-18-34-30.bpo-2180.aBqHeW.rst

-Treat line continuation at EOF as a ``SyntaxError`` by Anthony Sottile.

Misc/NEWS.d/next/Core and Builtins/2019-05-21-16-21-22.bpo-36878.EFRHZ3.rst

-Store text appearing after a `# type: ignore` comment in the AST. For
-example a type ignore like `# type: ignore[E1000]` will have the string
-`"[E1000]"` stored in its AST node.

Misc/NEWS.d/next/Core and Builtins/2019-05-22-11-16-16.bpo-36878.QwLa3P.rst

-Only accept text after `# type: ignore` if the first character is ASCII.
-This is to disallow things like `# type: ignoreé`.

Misc/NEWS.d/next/Core and Builtins/2019-05-22-23-01-29.bpo-36829.MfOcUg.rst

-:c:func:`PyErr_WriteUnraisable` now creates a traceback object if there is
-no current traceback. Moreover, call :c:func:`PyErr_NormalizeException` and
-:c:func:`PyException_SetTraceback` to normalize the exception value. Ignore any
-error.

Misc/NEWS.d/next/Core and Builtins/2019-05-23-04-19-13.bpo-37007.d1SOtF.rst

-Implement :func:`socket.if_nameindex()`, :func:`socket.if_nametoindex()`, and
-:func:`socket.if_indextoname()` on Windows.

Misc/NEWS.d/next/Core and Builtins/2019-05-24-12-38-40.bpo-37032.T8rSH8.rst

-Added new ``replace()`` method to the code type (:class:`types.CodeType`).

Misc/NEWS.d/next/Core and Builtins/2019-05-25-08-18-01.bpo-26836.rplYWW.rst

-Add :func:`os.memfd_create`.

Misc/NEWS.d/next/Core and Builtins/2019-05-25-17-18-26.bpo-22385.VeVvhJ.rst

-The `bytes.hex`, `bytearray.hex`, and `memoryview.hex` methods as well as
-the `binascii.hexlify` and `b2a_hex` functions now have the ability to
-include an optional separator between hex bytes.  This functionality was
-inspired by MicroPython's hexlify implementation.

Misc/NEWS.d/next/Core and Builtins/2019-05-27-14-46-24.bpo-37050.7MyZGg.rst

-Improve the AST for "debug" f-strings, which use '=' to print out the source
-of the expression being evaluated.  Delete expr_text from the FormattedValue
-node, and instead use a Constant string node (possibly merged with adjacent
-constant expressions inside the f-string).

Misc/NEWS.d/next/Core and Builtins/2019-05-27-18-00-19.bpo-26423.RgUOE8.rst

-Fix possible overflow in ``wrap_lenfunc()`` when
-``sizeof(long) < sizeof(Py_ssize_t)`` (e.g., 64-bit Windows).

Misc/NEWS.d/next/Core and Builtins/2019-05-28-17-02-46.bpo-37029.MxpgfJ.rst

-Freeing a great many small objects could take time quadratic in the number of arenas, due to using linear search to keep ``obmalloc.c``'s list of usable arenas sorted by order of number of free memory pools.  This is accomplished without search now, leaving the worst-case time linear in the number of arenas.  For programs where this quite visibly matters (typically with more than 100 thousand small objects alive simultaneously), this can greatly reduce the time needed to release their memory.
\ No newline at end of file

Misc/NEWS.d/next/Core and Builtins/2019-05-28-18-18-55.bpo-37072.1Hewl3.rst

-Fix crash in PyAST_FromNodeObject() when flags is NULL.
\ No newline at end of file

Misc/NEWS.d/next/Core and Builtins/2019-05-29-22-03-09.bpo-26219.Ovf1Qs.rst

-Implemented per opcode cache mechanism and ``LOAD_GLOBAL`` instruction use
-it. ``LOAD_GLOBAL`` is now about 40% faster. Contributed by Yury Selivanov,
-and Inada Naoki.

Misc/NEWS.d/next/Core and Builtins/2019-05-30-17-33-55.bpo-37087.vElenE.rst

-Add native thread ID (TID) support to OpenBSD.
\ No newline at end of file

Misc/NEWS.d/next/Core and Builtins/2019-05-31-11-55-49.bpo-20092.KIMjBW.rst

-Constructors of :class:`int`, :class:`float` and :class:`complex` will now
-use the :meth:`~object.__index__` special method, if available and the
-corresponding method :meth:`~object.__int__`, :meth:`~object.__float__`
-or :meth:`~object.__complex__` is not available.

Misc/NEWS.d/next/Core and Builtins/2019-06-01-16-53-41.bpo-37122.dZ3-NY.rst

-Make the *co_argcount* attribute of code objects represent the total number
-of positional arguments (including positional-only arguments). The value of
-*co_posonlyargcount* can be used to distinguish which arguments are
-positional only, and the difference (*co_argcount* - *co_posonlyargcount*)
-is the number of positional-or-keyword arguments. Patch by Pablo Galindo.

Misc/NEWS.d/next/Core and Builtins/2019-06-01-20-03-13.bpo-37126.tP6lL4.rst

-All structseq objects are now tracked by the garbage collector. Patch by
-Pablo Galindo.

Misc/NEWS.d/next/Core and Builtins/2019-06-03-00-51-02.bpo-35814.Cf7sGY.rst

-Allow unpacking in the right hand side of annotated assignments. In
-particular, ``t: Tuple[int, ...] = x, y, *z`` is now allowed.

Misc/NEWS.d/next/Documentation/2017-12-08-20-30-37.bpo-20285.cfnp0J.rst

-Expand object.__doc__ (docstring) to make it clearer.
-Modify pydoc.py so that help(object) lists object methods
-(for other classes, help omits methods of the object base class.)

Misc/NEWS.d/next/Documentation/2018-04-08-19-09-22.bpo-25735.idVQBD.rst

-Added documentation for func factorial to indicate that returns integer values

Misc/NEWS.d/next/Documentation/2018-05-13-10-36-37.bpo-33482.jalAaQ.rst

-Make `codecs.StreamRecoder.writelines` take a list of bytes.

Misc/NEWS.d/next/Documentation/2018-05-17-21-02-00.bpo-33519.Q7s2FB.rst

-Clarify that `copy()` is not part of the `MutableSequence` ABC.

Misc/NEWS.d/next/Documentation/2018-10-07-03-04-57.bpo-32995.TXN9ur.rst

-Added the context variable in glossary.

Misc/NEWS.d/next/Documentation/2019-01-09-17-56-35.bpo-35397.ZMreIz.rst

-Remove deprecation and document urllib.parse.unwrap(). Patch contributed by
-Rémi Lapeyre.

Misc/NEWS.d/next/Documentation/2019-02-21-18-13-50.bpo-22865.6hg6J8.rst

-Add detail to the documentation on the `pty.spawn` function.
\ No newline at end of file

Misc/NEWS.d/next/Documentation/2019-05-05-07-58-50.bpo-36797.W1X4On.rst

-More of the legacy distutils documentation has been either pruned, or else
-more clearly marked as being retained solely until the setuptools
-documentation covers it independently.

Misc/NEWS.d/next/Documentation/2019-05-07-02-30-51.bpo-36783.gpC8E2.rst

-Added C API Documentation for Time_FromTimeAndFold and PyDateTime_FromDateAndTimeAndFold as per PEP 495.
-Patch by Edison Abahurire.
\ No newline at end of file

Misc/NEWS.d/next/Documentation/2019-05-08-13-17-44.bpo-35924.lqbNpW.rst

-Add a note to the ``curses.addstr()`` documentation to warn that multiline
-strings can cause segfaults because of an ncurses bug.

Misc/NEWS.d/next/Documentation/2019-05-11-17-42-15.bpo-36868.yioL0R.rst

-What's new now mentions SSLContext.hostname_checks_common_name instead of
-SSLContext.host_flags.

Misc/NEWS.d/next/Documentation/2019-05-20-22-21-17.bpo-36984.IjZlmS.rst

-Improve version added references in ``typing`` module - by Anthony Sottile.

Misc/NEWS.d/next/Documentation/2019-05-27-17-28-58.bpo-36686.Zot4sx.rst

-Improve documentation of the stdin, stdout, and stderr arguments of of the
-``asyncio.subprocess_exec`` function to specficy which values are supported.
-Also mention that decoding as text is not supported.
-
-Add a few tests to verify that the various values passed to the std*
-arguments actually work.

Misc/NEWS.d/next/Documentation/2019-05-31-10-46-36.bpo-36896.wkXTW9.rst

-Clarify that some types have unstable constructor signature between Python
-versions.

Misc/NEWS.d/next/IDLE/2017-12-25-18-48-50.bpo-32411.vNwDhe.rst

-In browser.py, remove extraneous sorting by line number since dictionary was
-created in line number order.

Misc/NEWS.d/next/IDLE/2019-05-05-16-27-53.bpo-13102.AGNWYJ.rst

-When saving a file, call os.fsync() so bits are flushed to e.g. USB drive.

Misc/NEWS.d/next/IDLE/2019-05-19-22-02-22.bpo-36958.DZUC6G.rst

-Print any argument other than None or int passed to SystemExit or
-sys.exit().

Misc/NEWS.d/next/IDLE/2019-05-24-18-57-57.bpo-37038.AJ3RwQ.rst

-Make idlelib.run runnable; add test clause.

Misc/NEWS.d/next/IDLE/2019-06-02-14-10-52.bpo-35610.0w_v6Y.rst

-Replace now redundant .context_use_ps1 with .prompt_last_line. This finishes
-change started in bpo-31858.

Misc/NEWS.d/next/Library/2016-07-27-11-06-43.bpo-23395.MuCEX9.rst

-``_thread.interrupt_main()`` now avoids setting the Python error status
-if the ``SIGINT`` signal is ignored or not handled by Python.

Misc/NEWS.d/next/Library/2017-10-21-12-07-56.bpo-31829.6IhP-O.rst

-``\r``, ``\0`` and ``\x1a`` (end-of-file on Windows) are now escaped in
-protocol 0 pickles of Unicode strings. This allows to load them without loss
-from files open in text mode in Python 2.

Misc/NEWS.d/next/Library/2017-10-24-00-42-14.bpo-27141.zbAgSs.rst

-Added a ``__copy__()`` to ``collections.UserList`` and
-``collections.UserDict`` in order to correctly implement shallow copying of
-the objects. Patch by Bar Harel.

Misc/NEWS.d/next/Library/2017-12-13-17-49-56.bpo-32299.eqAPWs.rst

-Changed :func:`unittest.mock.patch.dict` to return the patched
-dictionary when used as context manager. Patch by Vadim Tsander.

Misc/NEWS.d/next/Library/2018-01-07-21-04-50.bpo-32515.D8_Wcb.rst

-trace.py can now run modules via python3 -m trace -t --module module_name

Misc/NEWS.d/next/Library/2018-03-08-16-15-00.bpo-22102.th33uD.rst

-Added support for ZIP files with disks set to 0. Such files are commonly created by builtin tools on Windows when use ZIP64 extension.
-Patch by Francisco Facioni.

Misc/NEWS.d/next/Library/2018-03-20-20-57-00.bpo-32941.9FU0gL.rst

-Allow :class:`mmap.mmap` objects to access the madvise() system call
-(through :meth:`mmap.mmap.madvise`).

Misc/NEWS.d/next/Library/2018-03-22-19-13-19.bpo-33123._Y5ooE.rst

-:class:`pathlib.Path.unlink` now accepts a *missing_ok* parameter to avoid a
-:exc:`FileNotFoundError` from being raised. Patch by Robert Buchholz.

Misc/NEWS.d/next/Library/2018-03-27-13-28-16.bpo-31961.GjLoYu.rst

-Added support for bytes and path-like objects in :func:`subprocess.Popen`
-on Windows.  The *args* parameter now accepts a :term:`path-like object` if
-*shell* is ``False`` and a sequence containing bytes and path-like objects.
-The *executable* parameter now accepts a bytes and :term:`path-like object`.
-The *cwd* parameter now accepts a bytes object.
-Based on patch by Anders Lorentsen.

Misc/NEWS.d/next/Library/2018-04-04-14-54-30.bpo-24882.urybpa.rst

-Change ThreadPoolExecutor to use existing idle threads before spinning up new ones.
\ No newline at end of file

Misc/NEWS.d/next/Library/2018-05-30-01-05-50.bpo-31922.fobsXJ.rst

-:meth:`asyncio.AbstractEventLoop.create_datagram_endpoint`:
-Do not connect UDP socket when broadcast is allowed.
-This allows to receive replies after a UDP broadcast.

Misc/NEWS.d/next/Library/2018-06-10-17-48-07.bpo-22454.qeiy_X.rst

-The :mod:`shlex` module now exposes :func:`shlex.join`, the inverse of
-:func:`shlex.split`. Patch by Bo Bayles.

Misc/NEWS.d/next/Library/2018-07-13-20-17-17.bpo-33361.dx2NVn.rst

-Fix a bug in :class:`codecs.StreamRecoder` where seeking might leave old data in a
-buffer and break subsequent read calls. Patch by Ammar Askar.

Misc/NEWS.d/next/Library/2018-08-03-09-47-20.bpo-34303.tOE2HP.rst

-Performance of :func:`functools.reduce` is slightly improved. Patch by
-Sergey Fedoseev.

Misc/NEWS.d/next/Library/2018-08-18-14-47-00.bpo-34424.wAlRuS.rst

-Fix serialization of messages containing encoded strings when the
-policy.linesep is set to a multi-character string. Patch by Jens Troeger.

Misc/NEWS.d/next/Library/2018-08-28-03-00-12.bpo-33569.45YlGG.rst

-dataclasses.InitVar: Exposes the type used to create the init var.

Misc/NEWS.d/next/Library/2018-09-13-20-33-24.bpo-26467.cahAk3.rst

-Added AsyncMock to support using unittest to mock asyncio coroutines.
-Patch by Lisa Roach.

Misc/NEWS.d/next/Library/2018-10-21-17-39-32.bpo-34271.P15VLM.rst

-Add debugging helpers to ssl module. It's now possible to dump key material
-and to trace TLS protocol. The default and stdlib contexts also support
-SSLKEYLOGFILE env var.

Misc/NEWS.d/next/Library/2018-11-04-16-39-46.bpo-26660.RdXz8a.rst

-Fixed permission errors in :class:`~tempfile.TemporaryDirectory` clean up.
-Previously ``TemporaryDirectory.cleanup()`` failed when non-writeable or
-non-searchable files or directories were created inside a temporary
-directory.

Misc/NEWS.d/next/Library/2019-01-02-19-48-23.bpo-35431.FhG6QA.rst

-Implement :func:`math.comb` that returns binomial coefficient, that computes
-the number of ways to choose k items from n items without repetition and
-without order.
-Patch by Yash Aggarwal and Keller Fuchs.

Misc/NEWS.d/next/Library/2019-01-11-17-09-15.bpo-31855.PlhfsX.rst

-:func:`unittest.mock.mock_open` results now respects the argument of read([size]).
-Patch contributed by Rémi Lapeyre.

Misc/NEWS.d/next/Library/2019-01-18-16-23-00.bpo-35721.d8djAJ.rst

-Fix :meth:`asyncio.SelectorEventLoop.subprocess_exec()` leaks file descriptors
-if ``Popen`` fails and called with ``stdin=subprocess.PIPE``.
-Patch by Niklas Fiekas.

Misc/NEWS.d/next/Library/2019-02-15-17-18-50.bpo-35125.h0xk0f.rst

-Asyncio: Remove inner callback on outer cancellation in shield

Misc/NEWS.d/next/Library/2019-03-01-17-59-39.bpo-31904.38djdk.rst

-Add posix module support for VxWorks.