Python 3.8.0a4

Include/patchlevel.h

@@ -20,10 +20,10 @@
 #define PY_MINOR_VERSION        8
 #define PY_MICRO_VERSION        0
 #define PY_RELEASE_LEVEL        PY_RELEASE_LEVEL_ALPHA
-#define PY_RELEASE_SERIAL       3
+#define PY_RELEASE_SERIAL       4
 
 /* Version as a string */
-#define PY_VERSION              "3.8.0a3+"
+#define PY_VERSION              "3.8.0a4"
 /*--end constants--*/
 
 /* Version as a single 4-byte hex number, e.g. 0x010502B2 == 1.5.2b2.

Misc/NEWS.d/next/Build/2019-04-02-09-25-23.bpo-36503.0xzfkQ.rst

-Remove references to "aix3" and "aix4".
-Patch by M. Felt.

Misc/NEWS.d/next/Build/2019-04-02-17-01-23.bpo-36508.SN5Y6N.rst

-``python-config --ldflags`` no longer includes flags of the
-``LINKFORSHARED`` variable. The ``LINKFORSHARED`` variable must only be used
-to build executables.

Misc/NEWS.d/next/Build/2019-04-06-18-53-03.bpo-36544.hJr2_a.rst

-Fix regression introduced in bpo-36146 refactoring setup.py

Misc/NEWS.d/next/Build/2019-04-09-17-31-47.bpo-36577.34kuUW.rst

-setup.py now correctly reports missing OpenSSL headers and libraries again.

Misc/NEWS.d/next/Build/2019-04-09-18-19-43.bpo-36465.-w6vx6.rst

-Release builds and debug builds are now ABI compatible: defining the
-``Py_DEBUG`` macro no longer implies the ``Py_TRACE_REFS`` macro, which
-introduces the only ABI incompatibility. The ``Py_TRACE_REFS`` macro, which
-adds the :func:`sys.getobjects` function and the :envvar:`PYTHONDUMPREFS`
-environment variable, can be set using the new ``./configure --with-trace-refs``
-build option.

Misc/NEWS.d/next/Build/2019-04-11-18-50-58.bpo-36605.gk5czf.rst

-``make tags`` and ``make TAGS`` now also parse ``Modules/_io/*.c`` and
-``Modules/_io/*.h``.

Misc/NEWS.d/next/Build/2019-04-12-19-49-10.bpo-36618.gcI9iq.rst

-Add ``-fmax-type-align=8`` to CFLAGS when clang compiler is detected. The
-pymalloc memory allocator aligns memory on 8 bytes. On x86-64, clang expects
-alignment on 16 bytes by default and so uses MOVAPS instruction which can
-lead to segmentation fault. Instruct clang that Python is limited to
-alignemnt on 8 bytes to use MOVUPS instruction instead: slower but don't
-trigger a SIGSEGV if the memory is not aligned on 16 bytes. Sadly, the flag
-must be added to ``CFLAGS`` and not just ``CFLAGS_NODIST``, since third party C
-extensions can have the same issue.

Misc/NEWS.d/next/Build/2019-04-15-15-01-29.bpo-31904.38fdkg.rst

-Don't build the ``_crypt`` extension on VxWorks.

Misc/NEWS.d/next/Build/2019-04-16-13-58-52.bpo-36635.JKlzkf.rst

-Change ``PyAPI_FUNC(type)``, ``PyAPI_DATA(type)`` and ``PyMODINIT_FUNC``
-macros of ``pyport.h`` when ``Py_BUILD_CORE_MODULE`` is defined. The
-``Py_BUILD_CORE_MODULE`` define must be now be used to build a C extension
-as a dynamic library accessing Python internals: export the PyInit_xxx()
-function in DLL exports on Windows.

Misc/NEWS.d/next/Build/2019-04-24-02-29-15.bpo-36707.8ZNB67.rst

-``./configure --with-pymalloc`` no longer adds the ``m`` flag to SOABI
-(sys.implementation.cache_tag). Enabling or disabling pymalloc has no impact
-on the ABI.

Misc/NEWS.d/next/Build/2019-04-25-01-51-52.bpo-21536.ACQkiC.rst

-On Unix, C extensions are no longer linked to libpython except on Android.
-
-It is now possible for a statically linked Python to load a C extension built
-using a shared library Python.
-
-When Python is embedded, ``libpython`` must not be loaded with ``RTLD_LOCAL``,
-but ``RTLD_GLOBAL`` instead. Previously, using ``RTLD_LOCAL``, it was already
-not possible to load C extensions which were not linked to ``libpython``, such
-as C extensions of the standard library built by the ``*shared*`` section of
-``Modules/Setup``.
-
-distutils, python-config and python-config.py have been modified.

Misc/NEWS.d/next/Build/2019-04-29-09-57-20.bpo-36747.1YEyu-.rst

-Remove the stale scriptsinstall Makefile target.

Misc/NEWS.d/next/C API/2019-01-23-12-38-11.bpo-35810.wpbWeb.rst

-Modify ``PyObject_Init`` to correctly increase the refcount of heap-
-allocated Type objects. Also fix the refcounts of the heap-allocated types
-that were either doing this manually or not decreasing the type's refcount
-in tp_dealloc

Misc/NEWS.d/next/C API/2019-02-19-08-23-42.bpo-36025.tnwylQ.rst

-Fixed an accidental change to the datetime C API where the arguments to the
-:c:func:`PyDate_FromTimestamp` function were incorrectly interpreted as a
-single timestamp rather than an arguments tuple, which causes existing code to
-start raising :exc:`TypeError`. The backwards-incompatible change was only
-present in alpha releases of Python 3.8. Patch by Paul Ganssle.

Misc/NEWS.d/next/C API/2019-03-27-15-58-23.bpo-36443.tAfZR9.rst

-Since Python 3.7.0, calling :c:func:`Py_DecodeLocale` before
-:c:func:`Py_Initialize` produces mojibake if the ``LC_CTYPE`` locale is coerced
-and/or if the UTF-8 Mode is enabled by the user configuration. The LC_CTYPE
-coercion and UTF-8 Mode are now disabled by default to fix the mojibake issue.
-They must now be enabled explicitly (opt-in) using the new
-:c:func:`_Py_PreInitialize` API with ``_PyPreConfig``.

Misc/NEWS.d/next/C API/2019-04-11-12-20-35.bpo-36389.P9QFoP.rst

-Change the value of ``CLEANBYTE``, ``DEADDYTE`` and ``FORBIDDENBYTE`` internal
-constants used by debug hooks on Python memory allocators
-(:c:func:`PyMem_SetupDebugHooks` function). Byte patterns ``0xCB``, ``0xDB``
-and ``0xFB`` have been replaced with ``0xCD``, ``0xDD`` and ``0xFD`` to use the
-same values than Windows CRT debug ``malloc()`` and ``free()``.

Misc/NEWS.d/next/C API/2019-04-16-21-18-19.bpo-36641.pz-DIR.rst

-:c:macro:`PyDoc_VAR(name)` and :c:macro:`PyDoc_STRVAR(name,str)` now create
-``static const char name[]`` instead of ``static char name[]``.  Patch by Inada Naoki.

Misc/NEWS.d/next/C API/2019-05-01-00-42-08.bpo-36763.vghb86.rst

-Fix memory leak in :c:func:`Py_SetStandardStreamEncoding`: release memory if
-the function is called twice.

Misc/NEWS.d/next/Core and Builtins/2018-12-08-03-40-43.bpo-18372.DT1nR0.rst

-Add missing :c:func:`PyObject_GC_Track` calls in the :mod:`pickle` module.
-Patch by Zackery Spytz.

Misc/NEWS.d/next/Core and Builtins/2019-03-20-00-37-24.bpo-36143.fnKoKo.rst

-Regenerate :mod:`keyword` from the Grammar and Tokens file using pgen. Patch
-by Pablo Galindo.

Misc/NEWS.d/next/Core and Builtins/2019-03-25-13-45-19.bpo-36440.gkvzhi.rst

-Include node names in ``ParserError`` messages, instead of numeric IDs.
-Patch by A. Skrobov.

Misc/NEWS.d/next/Core and Builtins/2019-03-25-23-37-26.bpo-36430.sd9xxQ.rst

-Fix a possible reference leak in :func:`itertools.count`.

Misc/NEWS.d/next/Core and Builtins/2019-03-26-17-23-02.bpo-36433.-8XzZf.rst

-Fixed TypeError message in classmethoddescr_call.

Misc/NEWS.d/next/Core and Builtins/2019-03-27-22-35-16.bpo-36459.UAvkKp.rst

-Fix a possible double ``PyMem_FREE()`` due to tokenizer.c's ``tok_nextc()``.

Misc/NEWS.d/next/Core and Builtins/2019-03-27-23-53-00.bpo-36452.xhK2lT.rst

-Changing ``dict`` keys during iteration of the dict itself, ``keys()``,
-``values()``, or ``items()`` will now be detected in certain corner cases where
-keys are deleted/added so that the number of keys isn't changed.
-A `RuntimeError` will be raised after ``len(dict)`` iterations.
-Contributed by Thomas Perl.

Misc/NEWS.d/next/Core and Builtins/2019-03-28-15-22-45.bpo-24214.tZ6lYU.rst

-Fixed support of the surrogatepass error handler in the UTF-8 incremental
-decoder.

Misc/NEWS.d/next/Core and Builtins/2019-03-29-18-47-50.bpo-20844.ge-7SM.rst

-Fix running script with encoding cookie and LF line ending
-may fail on Windows.

Misc/NEWS.d/next/Core and Builtins/2019-04-02-04-10-32.bpo-36504.k_V8Bm.rst

-Fix signed integer overflow in _ctypes.c's ``PyCArrayType_new()``.

Misc/NEWS.d/next/Core and Builtins/2019-04-02-20-02-22.bpo-36475.CjRps3.rst

-:c:func:`PyEval_AcquireLock` and :c:func:`PyEval_AcquireThread` now
-terminate the current thread if called while the interpreter is
-finalizing, making them consistent with :c:func:`PyEval_RestoreThread`,
-:c:func:`Py_END_ALLOW_THREADS`, and :c:func:`PyGILState_Ensure`.
\ No newline at end of file

Misc/NEWS.d/next/Core and Builtins/2019-04-06-20-59-19.bpo-36540.SzVUfC.rst

-Implement :pep:`570` (Python positional-only parameters). Patch by Pablo
-Galindo.

Misc/NEWS.d/next/Core and Builtins/2019-04-11-12-41-31.bpo-36549.QSp8of.rst

-Change str.capitalize to use titlecase for the first character instead of
-uppercase.

Misc/NEWS.d/next/Core and Builtins/2019-04-11-14-36-55.bpo-36588.wejLoC.rst

-On AIX, :attr:`sys.platform` doesn't contain the major version anymore.
-Always return ``'aix'``, instead of ``'aix3'`` .. ``'aix7'``.  Since
-older Python versions include the version number, it is recommended to
-always use ``sys.platform.startswith('aix')``.
-Contributed by M. Felt.

Misc/NEWS.d/next/Core and Builtins/2019-04-12-12-32-39.bpo-36611.zbo9WQ.rst

-Debug memory allocators: disable serialno field by default from debug hooks on
-Python memory allocators to reduce the memory footprint by 5%. Enable
-:mod:`tracemalloc` to get the traceback where a memory block has been allocated
-when a fatal memory error is logged to decide where to put a breakpoint.
-Compile Python with ``PYMEM_DEBUG_SERIALNO`` defined to get back the field.

Misc/NEWS.d/next/Core and Builtins/2019-04-12-15-49-15.bpo-20180.KUqVk7.rst

-``dict.pop()`` is now up to 33% faster thanks to Argument Clinic. Patch by
-Inada Naoki.

Misc/NEWS.d/next/Core and Builtins/2019-04-13-02-08-44.bpo-36623.HR_xhB.rst

-Remove parser headers and related function declarations that lack
-implementations after the removal of pgen.

Misc/NEWS.d/next/Core and Builtins/2019-04-16-11-56-12.bpo-32849.aeSg-D.rst

-Fix Python Initialization code on FreeBSD to detect properly when stdin file
-descriptor (fd 0) is invalid.

Misc/NEWS.d/next/Core and Builtins/2019-04-25-21-02-40.bpo-36722.8NApVM.rst

-In debug build, import now also looks for C extensions compiled in release
-mode and for C extensions compiled in the stable ABI.

Misc/NEWS.d/next/Core and Builtins/2019-04-29-23-30-21.bpo-36751.3NCRbm.rst

-The :func:`~inspect.getfullargspec` function in the :mod:`inspect` module is
-deprecated in favor of the :func:`inspect.signature` API. Contributed by
-Pablo Galindo.

Misc/NEWS.d/next/Documentation/2018-02-22-15-48-16.bpo-32913.f3utho.rst

-Added re.Match.groupdict example to regex HOWTO.

Misc/NEWS.d/next/Documentation/2018-06-15-15-57-37.bpo-33832.xBFhKw.rst

-Add glossary entry for 'magic method'.

Misc/NEWS.d/next/Documentation/2018-12-25-12-56-57.bpo-35581.aA7r6T.rst

-@typing.type_check_only now allows type stubs to mark functions and classes not available during runtime.
\ No newline at end of file

Misc/NEWS.d/next/Documentation/2019-02-24-03-15-10.bpo-33043.8knWTS.rst

-Updates the docs.python.org page with the addition of a 'Contributing to Docs' link at the end of the page (between 'Reporting Bugs' and 'About Documentation'). Updates the 'Found a Bug' page with additional links and information in the Documentation Bugs section.
\ No newline at end of file

Misc/NEWS.d/next/Documentation/2019-03-08-15-39-47.bpo-36157.nF1pP1.rst

-Added Documention for  PyInterpreterState_Main().
\ No newline at end of file

Misc/NEWS.d/next/Documentation/2019-03-23-09-25-12.bpo-36345.L704Zv.rst

-Using the code of the ``Tools/scripts/serve.py`` script as an example in the
-:mod:`wsgiref` documentation.  Contributed by Stéphane Wirtel.

Misc/NEWS.d/next/Documentation/2019-03-26-14-58-34.bpo-36345.r2stx3.rst

-Avoid the duplication of code from ``Tools/scripts/serve.py`` in using the
-:rst:dir:`literalinclude` directive for the basic wsgiref-based web server in the
-documentation of :mod:`wsgiref`.  Contributed by Stéphane Wirtel.

Misc/NEWS.d/next/Documentation/2019-03-27-22-46-00.bpo-36425.kG9gx1.rst

-New documentation translation: `Simplified Chinese
-<https://docs.python.org/zh-cn/>`_.

Misc/NEWS.d/next/Documentation/2019-04-04-19-11-47.bpo-36523.sG1Tr4.rst

-Add docstring for io.IOBase.writelines().

Misc/NEWS.d/next/Documentation/2019-04-14-19-46-21.bpo-30840.R-JFzw.rst

-Document relative imports
\ No newline at end of file

Misc/NEWS.d/next/Documentation/2019-04-15-12-02-45.bpo-36625.x3LMCF.rst

-Remove obsolete comments from docstrings in fractions.Fraction

Misc/NEWS.d/next/IDLE/2019-03-26-00-09-50.bpo-36429.w-jL2e.rst

-Fix starting IDLE with pyshell. Add idlelib.pyshell alias at top; remove
-pyshell alias at bottom. Remove obsolete __name__=='__main__' command.

Misc/NEWS.d/next/Library/2017-08-30-20-27-00.bpo-31292.dKIaZb.rst

-Fix ``setup.py check --restructuredtext`` for
-files containing ``include`` directives.

Misc/NEWS.d/next/Library/2018-04-06-11-06-23.bpo-31310.eq9ky0.rst

-Fix the multiprocessing.semaphore_tracker so it is reused by child processes

Misc/NEWS.d/next/Library/2018-04-11-11-41-52.bpo-33291.-xLGf8.rst

-Do not raise AttributeError when calling the inspect functions
-isgeneratorfunction, iscoroutinefunction, isasyncgenfunction on a method
-created from an arbitrary callable. Instead, return False.

Misc/NEWS.d/next/Library/2018-05-29-18-34-53.bpo-33530._4Q_bi.rst

-Implemented Happy Eyeballs in `asyncio.create_connection()`. Added two new
-arguments, *happy_eyeballs_delay* and *interleave*,
-to specify Happy Eyeballs behavior.

Misc/NEWS.d/next/Library/2018-07-18-11-25-34.bpo-34139.tKbmW7.rst

-Remove stale unix datagram socket before binding

Misc/NEWS.d/next/Library/2018-07-30-12-00-15.bpo-31658._bx7a_.rst

-:func:`xml.sax.parse` now supports :term:`path-like <path-like object>`.
-Patch by Mickaël Schoentgen.

Misc/NEWS.d/next/Library/2018-10-05-16-01-00.bpo-34547.abbaa.rst

-:class:`wsgiref.handlers.BaseHandler` now handles abrupt client connection
-terminations gracefully. Patch by Petter Strandmark.

Misc/NEWS.d/next/Library/2018-10-27-11-54-12.bpo-35082.HDj1nr.rst

-Don't return deleted attributes when calling dir on a
-:class:`unittest.mock.Mock`.

Misc/NEWS.d/next/Library/2018-11-07-23-44-25.bpo-25451.re_8db.rst

-Add transparency methods to :class:`tkinter.PhotoImage`.  Patch by Zackery
-Spytz.

Misc/NEWS.d/next/Library/2018-12-05-09-55-05.bpo-35416.XALKZG.rst

-Fix potential resource warnings in distutils. Patch by Mickaël Schoentgen.

Misc/NEWS.d/next/Library/2019-01-18-23-10-10.bpo-23078.l4dFoj.rst

-Add support for :func:`classmethod` and :func:`staticmethod` to
-:func:`unittest.mock.create_autospec`.  Initial patch by Felipe Ochoa.

Misc/NEWS.d/next/Library/2019-02-07-20-25-39.bpo-35934.QmfNmY.rst

-Added :meth:`~socket.create_server()` and :meth:`~socket.has_dualstack_ipv6()`
-convenience functions to automate the necessary tasks usually involved when
-creating a server socket, including accepting both IPv4 and IPv6 connections
-on the same socket.  (Contributed by Giampaolo Rodola in :issue:`17561`.)

Misc/NEWS.d/next/Library/2019-02-13-18-56-22.bpo-17396.oKRkrD.rst

-:mod:`modulefinder` no longer crashes when encountering syntax errors in followed imports.
-Patch by Brandt Bucher.
\ No newline at end of file

Misc/NEWS.d/next/Library/2019-02-13-18-56-27.bpo-35376.UFhYLj.rst

-:mod:`modulefinder` correctly handles modules that have the same name as a bad package.
-Patch by Brandt Bucher.
\ No newline at end of file

Misc/NEWS.d/next/Library/2019-02-16-22-19-32.bpo-35936.Ay5WtD.rst

-:mod:`modulefinder` no longer depends on the deprecated :mod:`imp` module, and the initializer for :class:`modulefinder.ModuleFinder` now has immutable default arguments.
-Patch by Brandt Bucher.
\ No newline at end of file

Misc/NEWS.d/next/Library/2019-02-17-12-55-51.bpo-36004.hCt_KK.rst

-Added new alternate constructors :meth:`datetime.date.fromisocalendar` and
-:meth:`datetime.datetime.fromisocalendar`, which construct date objects from
-ISO year, week number and weekday; these are the inverse of each class's
-``isocalendar`` method. Patch by Paul Ganssle.

Misc/NEWS.d/next/Library/2019-03-07-20-02-18.bpo-36227.i2Z1XR.rst

-Added support for keyword arguments `default_namespace` and `xml_declaration` in functions
-ElementTree.tostring() and ElementTree.tostringlist().

Misc/NEWS.d/next/Library/2019-03-13-16-48-42.bpo-31904.9sjd38.rst

-Add time module support and fix test_time faiures for VxWorks.

Misc/NEWS.d/next/Library/2019-03-18-16-16-55.bpo-36348.E0w_US.rst

-The :meth:`imap.IMAP4.logout` method no longer ignores silently arbitrary
-exceptions.

Misc/NEWS.d/next/Library/2019-03-20-15-13-18.bpo-36366.n0eav_.rst

-Calling ``stop()`` on an unstarted or stopped :func:`unittest.mock.patch`
-object will now return `None` instead of raising :exc:`RuntimeError`,
-making the method idempotent.
-Patch by Karthikeyan Singaravelan.

Misc/NEWS.d/next/Library/2019-03-22-13-47-52.bpo-36326.WCnEI5.rst

-inspect.getdoc() can now find docstrings for member objects when __slots__
-is a dictionary.

Misc/NEWS.d/next/Library/2019-03-23-17-16-15.bpo-36407.LG3aC4.rst

-Fixed wrong indentation writing for CDATA section in xml.dom.minidom.
-Patch by Vladimir Surjaninov.

Misc/NEWS.d/next/Library/2019-03-26-14-20-59.bpo-36434.PTdidw.rst

-Errors during writing to a ZIP file no longer prevent to properly close it.

Misc/NEWS.d/next/Library/2019-03-27-02-09-22.bpo-36385.we2F45.rst

-Stop rejecting IPv4 octets for being ambiguously octal. Leading zeros are ignored, and no longer are assumed to specify octal octets. Octets are always decimal numbers. Octets must still be no more than three digits, including leading zeroes.

Misc/NEWS.d/next/Library/2019-03-28-21-17-08.bpo-30427.lxzvbw.rst

-``os.path.normcase()`` relies on ``os.fspath()`` to check the type of its argument. Redundant checks have been removed from its ``posixpath.normcase()`` and ``ntpath.normcase()`` implementations.
-Patch by Wolfgang Maier.

Misc/NEWS.d/next/Library/2019-03-31-01-18-52.bpo-27181.LVUWcc.rst

-Add statistics.geometric_mean().

Misc/NEWS.d/next/Library/2019-03-31-10-21-54.bpo-36492.f7vyUs.rst

-Deprecated passing required arguments like *func* as keyword arguments
-in functions which should accept arbitrary keyword arguments and pass them
-to other function. Arbitrary keyword arguments (even with names "self" and
-"func") can now be passed to these functions if the required arguments are
-passed as positional arguments.

Misc/NEWS.d/next/Library/2019-04-03-20-46-47.bpo-36522.g5x3By.rst

-If *debuglevel* is set to >0 in :mod:`http.client`, print all values for headers with multiple values for the same header name. Patch by Matt Houglum.

Misc/NEWS.d/next/Library/2019-04-05-21-29-53.bpo-36050.x9DRKE.rst

-Optimized ``http.client.HTTPResponse.read()`` for large response. Patch by
-Inada Naoki.

Misc/NEWS.d/next/Library/2019-04-06-14-23-00.bpo-36546.YXjbyY.rst

-Add statistics.quantiles()

Misc/NEWS.d/next/Library/2019-04-06-20-25-25.bpo-36232.SClmhb.rst

-Improve error message when trying to open existing DBM database that
-actually doesn't exist. Patch by Marco Rougeth.

Misc/NEWS.d/next/Library/2019-04-08-14-41-22.bpo-34373.lEAl_-.rst

-Fix :func:`time.mktime` error handling on AIX for year before 1970.

Misc/NEWS.d/next/Library/2019-04-09-04-08-46.bpo-17561.hOhVnh.rst

-Set backlog=None as the default for socket.create_server.

Misc/NEWS.d/next/Library/2019-04-09-12-02-35.bpo-36559.LbDRrw.rst

-The random module now prefers the lean internal _sha512 module over hashlib
-for seed(version=2) to optimize import time.

Misc/NEWS.d/next/Library/2019-04-09-14-46-28.bpo-33461.SYJM-E.rst

-``json.loads`` now emits ``DeprecationWarning`` when ``encoding`` option is
-specified.  Patch by Matthias Bussonnier.

Misc/NEWS.d/next/Library/2019-04-09-22-40-52.bpo-36575.Vg_p92.rst

-The ``_lsprof`` module now uses internal timer same to ``time.perf_counter()`` by default.
-``gettimeofday(2)`` was used on Unix.  New timer has better resolution on most Unix
-platforms and timings are no longer impacted by system clock updates since ``perf_counter()``
-is monotonic. Patch by Inada Naoki.

Misc/NEWS.d/next/Library/2019-04-11-16-09-42.bpo-18748.QW7upB.rst

-In development mode (:option:`-X` ``dev``) and in debug build, the
-:class:`io.IOBase` destructor now logs ``close()`` exceptions. These exceptions
-are silent by default in release mode.

Misc/NEWS.d/next/Library/2019-04-11-22-11-24.bpo-36598.hfzDUl.rst

-Fix ``isinstance`` check for Mock objects with spec when the code is
-executed under tracing. Patch by Karthikeyan Singaravelan.

Misc/NEWS.d/next/Library/2019-04-12-13-52-15.bpo-36613.hqT1qn.rst

-Fix :mod:`asyncio` wait() not removing callback if exception
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Misc/NEWS.d/next/Library/2019-04-13-23-42-33.bpo-30485.JHhjJS.rst

-Path expressions in xml.etree.ElementTree can now avoid explicit namespace
-prefixes for tags (or the "{namespace}tag" notation) by passing a default
-namespace with an empty string prefix.

Misc/NEWS.d/next/Library/2019-04-15-12-22-09.bpo-25430.7_8kqc.rst

-improve performance of ``IPNetwork.__contains__()``
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Misc/NEWS.d/next/Library/2019-04-16-17-50-39.bpo-35755.Fg4EXb.rst

-:func:`shutil.which` and :func:`distutils.spawn.find_executable` now use
-``os.confstr("CS_PATH")`` if available instead of :data:`os.defpath`, if the
-``PATH`` environment variable is not set. Moreover, don't use
-``os.confstr("CS_PATH")`` nor :data:`os.defpath` if the ``PATH`` environment
-variable is set to an empty string.

Misc/NEWS.d/next/Library/2019-04-18-16-10-29.bpo-28552.MW1TLt.rst

-Fix :mod:`distutils.sysconfig` if :data:`sys.executable` is ``None`` or an
-empty string: use :func:`os.getcwd` to initialize ``project_base``.  Fix
-also the distutils build command: don't use :data:`sys.executable` if it is
-``None`` or an empty string.

Misc/NEWS.d/next/Library/2019-04-19-15-29-55.bpo-36650._EVdrz.rst

-The C version of functools.lru_cache() was treating calls with an empty
-``**kwargs`` dictionary as being distinct from calls with no keywords at all.
-This did not result in an incorrect answer, but it did trigger an unexpected
-cache miss.

Misc/NEWS.d/next/Library/2019-04-20-09-50-32.bpo-36673.XF4Egb.rst

-The TreeBuilder and XMLPullParser in xml.etree.ElementTree gained support
-for parsing comments and processing instructions.
-Patch by Stefan Behnel.

Misc/NEWS.d/next/Library/2019-04-20-13-10-34.bpo-36676.XF4Egb.rst

-The XMLParser() in xml.etree.ElementTree provides namespace prefix context to the
-parser target if it defines the callback methods "start_ns()" and/or "end_ns()".
-Patch by Stefan Behnel.

Misc/NEWS.d/next/Library/2019-04-24-17-08-45.bpo-36669.X4g0fu.rst

-Add missing matrix multiplication operator support to weakref.proxy.