[blurb] v3.8.0a1

Misc/NEWS.d/next/Build/2017-09-26-23-08-27.bpo-29442.fD8YTi.rst

-Replace optparse with argparse in setup.py

Misc/NEWS.d/next/Build/2018-02-21-12-46-00.bpo-32898.M15bZh.rst

-Fix the python debug build when using COUNT_ALLOCS.

Misc/NEWS.d/next/Build/2018-03-08-20-25-29.bpo-33012.k9Fe1q.rst

-gcc 8 has added a new warning heuristic to detect invalid function casts and
-a stock python build seems to hit that warning quite often.  The most common
-is the cast of a METH_NOARGS function (that uses just one argument) to a
-PyCFunction. Fix this by adding a dummy argument to all functions that
-implement METH_NOARGS.

Misc/NEWS.d/next/Build/2018-03-28-04-15-03.bpo-33163.hfpWuU.rst

-Upgrade pip to 9.0.3 and setuptools to v39.0.1.

Misc/NEWS.d/next/Build/2018-03-30-14-55-48.bpo-33182.CePczb.rst

-The embedding tests can once again be built with clang 6.0

Misc/NEWS.d/next/Build/2018-04-17-00-38-19.bpo-32232.o7G_UO.rst

-By default, modules configured in `Modules/Setup` are no longer built with
-`-DPy_BUILD_CORE`. Instead, modules that specifically need that preprocessor
-definition include it in their individual entries.

Misc/NEWS.d/next/Build/2018-04-30-16-53-00.bpo-33377.QBh6vP.rst

-Add new triplets for mips r6 and riscv variants (used in extension
-suffixes).

Misc/NEWS.d/next/Build/2018-04-30-17-19-37.bpo-33393.HkVCqI.rst

-Update config.guess and config.sub files.

Misc/NEWS.d/next/Build/2018-04-30-17-36-46.bpo-33394._Vdi4t.rst

-Enable the verbose build for extension modules, when GNU make is passed
-macros on the command line.

Misc/NEWS.d/next/Build/2018-05-13-17-21-54.bpo-33483.WOs-en.rst

-C compiler is now correctly detected from the standard environment
-variables. --without-gcc and --with-icc options have been removed.

Misc/NEWS.d/next/Build/2018-05-15-02-07-49.bpo-33512.X4Fy1Q.rst

-configure's check for "long double" has been simplified

Misc/NEWS.d/next/Build/2018-05-15-12-44-50.bpo-33522.mJoNcA.rst

-Enable CI builds on Visual Studio Team Services at
-https://python.visualstudio.com/cpython

Misc/NEWS.d/next/Build/2018-05-25-13-05-51.bpo-33648.bJ4JZH.rst

-The --with-c-locale-warning configuration flag has been removed. It has had
-no effect for about a year.

Misc/NEWS.d/next/Build/2018-05-28-11-40-22.bpo-33614.28e0sE.rst

-Ensures module definition files for the stable ABI on Windows are correctly
-regenerated.

Misc/NEWS.d/next/Build/2018-06-04-21-34-34.bpo-5755.65GmCj.rst

-Move ``-Wstrict-prototypes`` option to ``CFLAGS_NODIST`` from ``OPT``. This
-option emitted annoying warnings when building extension modules written in
-C++.

Misc/NEWS.d/next/Build/2018-06-15-18-18-16.bpo-30345.j-xRE1.rst

-Add -g to LDFLAGS when compiling with LTO to get debug symbols.

Misc/NEWS.d/next/Build/2018-07-10-21-33-25.bpo-32430.UN3Nk8.rst

-Rename Modules/Setup.dist to Modules/Setup, and remove the necessity to copy
-the former manually to the latter when updating the local source tree.

Misc/NEWS.d/next/Build/2018-07-15-16-49-06.bpo-34121.74G_lo.rst

-Fix detection of C11 atomic support on clang.

Misc/NEWS.d/next/Build/2018-07-27-09-52-48.bpo-34245.bBV0NI.rst

-The Python shared library is now installed with write permission (mode 0755),
-which is the standard way of installing such libraries.

Misc/NEWS.d/next/Build/2018-08-24-09-48-25.bpo-33015.s21y74.rst

-Fix an undefined behaviour in the pthread implementation of
-:c:func:`PyThread_start_new_thread`: add a function wrapper to always return
-``NULL``.

Misc/NEWS.d/next/Build/2018-08-31-19-41-09.bpo-34555.dfQcnm.rst

-Fix for case where it was not possible to have both
-``HAVE_LINUX_VM_SOCKETS_H`` and ``HAVE_SOCKADDR_ALG`` be undefined.

Misc/NEWS.d/next/Build/2018-09-06-07-15-20.bpo-34081.cuSTnH.rst

-Make Sphinx warnings as errors in the Docs Makefile.

Misc/NEWS.d/next/Build/2018-09-14-09-53-21.bpo-34582.j3omgk.rst

-Add JUnit XML output for regression tests and update Azure DevOps builds.

Misc/NEWS.d/next/Build/2018-09-17-13-56-12.bpo-34710.ARqIAK.rst

-Fixed SSL module build with OpenSSL & pedantic CFLAGS.

Misc/NEWS.d/next/Build/2018-09-18-16-28-31.bpo-34585.CGMu0h.rst

-Check for floating-point byte order in configure.ac using compilation tests
-instead of executing code, so that these checks work in cross-compiled
-builds.

Misc/NEWS.d/next/Build/2018-09-26-17-29-10.bpo-34765.AvxdVj.rst

-Update the outdated install-sh file to the latest revision from automake
-v1.16.1

Misc/NEWS.d/next/Build/2018-10-16-12-22-36.bpo-28015.ylSgFh.rst

-Have --with-lto works correctly with clang.

Misc/NEWS.d/next/Build/2018-10-17-17-38-57.bpo-35011.GgoPIC.rst

-Restores the use of pyexpatns.h to isolate our embedded copy of the expat C
-library so that its symbols do not conflict at link or dynamic loading time
-with an embedding application or other extension modules with their own
-version of libexpat.

Misc/NEWS.d/next/Build/2018-10-26-14-49-19.bpo-35059.PKsBxP.rst

-PCbuild: Set InlineFunctionExpansion to OnlyExplicitInline ("/Ob1" option)
-in pyproject.props in Debug mode to expand functions marked as inline. This
-change should make Python compiled in Debug mode a little bit faster on
-Windows.

Misc/NEWS.d/next/Build/2018-11-01-15-01-23.bpo-35139.XZTttb.rst

-Fix a compiler error when statically linking `pyexpat` in `Modules/Setup`.

Misc/NEWS.d/next/Build/2018-12-04-15-33-28.bpo-35351.ZhhBfT.rst

-When building Python with clang and LTO, LTO flags are no longer passed into
-CFLAGS to build third-party C extensions through distutils.

Misc/NEWS.d/next/Build/2018-12-05-22-28-40.bpo-35257.dmcd_s.rst

-Avoid leaking the linker flags from Link Time Optimizations (LTO)
-into distutils when compiling C extensions.
\ No newline at end of file

Misc/NEWS.d/next/Build/2018-12-14-19-36-05.bpo-35499.9yAldM.rst

-``make profile-opt`` no longer replaces ``CFLAGS_NODIST`` with ``CFLAGS``. It
-now adds profile-guided optimization (PGO) flags to ``CFLAGS_NODIST``: existing
-``CFLAGS_NODIST`` flags are kept.

Misc/NEWS.d/next/Build/2018-12-29-10-19-43.bpo-35550.BTuu8e.rst

-Fix incorrect Solaris #ifdef checks to look for __sun && __SVR4 instead of sun when compiling.
\ No newline at end of file

Misc/NEWS.d/next/Build/2019-01-02-11-23-33.bpo-35642.pjkhJe.rst

-Remove asynciomodule.c from pythoncore.vcxproj

Misc/NEWS.d/next/Build/2019-01-10-11-37-18.bpo-35683.pf5Oos.rst

-Improved Azure Pipelines build steps and now verifying layouts correctly

Misc/NEWS.d/next/Build/2019-02-02-13-34-05.bpo-34691.B-Lsj4.rst

-The _contextvars module is now built into the core Python library on
-Windows.

Misc/NEWS.d/next/C API/2017-10-12-23-24-27.bpo-30863.xrED19.rst

-:c:func:`PyUnicode_AsWideChar` and :c:func:`PyUnicode_AsWideCharString` no
-longer cache the ``wchar_t*`` representation of string objects.

Misc/NEWS.d/next/C API/2018-01-09-17-03-54.bpo-32374.SwwLoz.rst

-Document that m_traverse for multi-phase initialized modules can be called
-with m_state=NULL, and add a sanity check

Misc/NEWS.d/next/C API/2018-03-20-21-43-09.bpo-33042.FPFp64.rst

-Embedding applications may once again call PySys_ResetWarnOptions,
-PySys_AddWarnOption, and PySys_AddXOption prior to calling Py_Initialize.
\ No newline at end of file

Misc/NEWS.d/next/C API/2018-06-10-09-42-31.bpo-33818.50nlf3.rst

-:c:func:`PyExceptionClass_Name` will now return ``const char *`` instead of
-``char *``.

Misc/NEWS.d/next/C API/2018-06-21-17-19-31.bpo-32500.WGCNad.rst

-Fixed error messages for :c:func:`PySequence_Size`,
-:c:func:`PySequence_GetItem`, :c:func:`PySequence_SetItem` and
-:c:func:`PySequence_DelItem` called with a mapping and
-:c:func:`PyMapping_Size` called with a sequence.

Misc/NEWS.d/next/C API/2018-07-02-10-58-11.bpo-34008.COewz-.rst

-Py_Main() can again be called after Py_Initialize(), as in Python 3.6.

Misc/NEWS.d/next/C API/2018-07-08-12-06-18.bpo-32455.KVHlkz.rst

-Added :c:func:`PyCompile_OpcodeStackEffectWithJump`.

Misc/NEWS.d/next/C API/2018-07-09-11-39-54.bpo-23927.pDFkxb.rst

-Fixed :exc:`SystemError` in :c:func:`PyArg_ParseTupleAndKeywords` when the
-``w*`` format unit is used for optional parameter.

Misc/NEWS.d/next/C API/2018-07-22-14-58-06.bpo-34127.qkfnHO.rst

-Return grammatically correct error message based on argument count.
-Patch by Karthikeyan Singaravelan.

Misc/NEWS.d/next/C API/2018-07-24-11-57-35.bpo-34193.M6ch1Q.rst

-Fix pluralization in TypeError messages in getargs.c and typeobject.c:
-'1 argument' instead of '1 arguments' and '1 element' instead of '1 elements'.

Misc/NEWS.d/next/C API/2018-08-29-18-48-47.bpo-34523.lLQ8rh.rst

-Py_DecodeLocale() and Py_EncodeLocale() now use the UTF-8 encoding on
-Windows if Py_LegacyWindowsFSEncodingFlag is zero.

Misc/NEWS.d/next/C API/2018-10-05-17-06-49.bpo-34910.tSFrls.rst

-Ensure that :c:func:`PyObject_Print` always returns ``-1`` on error.  Patch
-by Zackery Spytz.

Misc/NEWS.d/next/C API/2018-10-13-16-30-54.bpo-34725.j52rIS.rst

-Adds _Py_SetProgramFullPath so embedders may override sys.executable

Misc/NEWS.d/next/C API/2018-11-01-13-58-37.bpo-35134.SbZo0o.rst

-Creation of a new ``Include/cpython/`` subdirectory.

Misc/NEWS.d/next/C API/2018-11-13-12-13-04.bpo-35081.gFd85N.rst

-The :c:func:`_PyObject_GC_TRACK` and :c:func:`_PyObject_GC_UNTRACK` macros
-have been removed from the public C API.

Misc/NEWS.d/next/C API/2018-11-22-13-52-36.bpo-35259.p07c61.rst

-Conditionally declare :c:func:`Py_FinalizeEx()` (new in 3.6) based on
-Py_LIMITED_API. Patch by Arthur Neufeld.

Misc/NEWS.d/next/C API/2018-11-22-18-15-46.bpo-35081.FdK9mV.rst

-Internal APIs surrounded by ``#ifdef Py_BUILD_CORE`` have been moved from
-``Include/*.h`` headers to new header files ``Include/internal/pycore_*.h``.

Misc/NEWS.d/next/C API/2018-11-22-18-34-23.bpo-35296.nxrIQt.rst

-``make install`` now also installs the internal API:
-``Include/internal/*.h`` header files.

Misc/NEWS.d/next/C API/2018-11-23-11-52-34.bpo-35059.BLSp6y.rst

-The following C macros have been converted to static inline functions:
-:c:func:`Py_INCREF`, :c:func:`Py_DECREF`, :c:func:`Py_XINCREF`,
-:c:func:`Py_XDECREF`, :c:func:`PyObject_INIT`, :c:func:`PyObject_INIT_VAR`.

Misc/NEWS.d/next/C API/2018-11-28-03-20-36.bpo-35322.Qcqsag.rst

-Fix memory leak in :c:func:`PyUnicode_EncodeLocale` and
-:c:func:`PyUnicode_EncodeFSDefault` on error handling.

Misc/NEWS.d/next/C API/2019-01-11-11-16-16.bpo-33817.nJ4yIj.rst

-Fixed :c:func:`_PyBytes_Resize` for empty bytes objects.

Misc/NEWS.d/next/C API/2019-01-22-17-04-10.bpo-35713.fmehdG.rst

-The :c:func:`PyByteArray_Init` and :c:func:`PyByteArray_Fini` functions have
-been removed. They did nothing since Python 2.7.4 and Python 3.2.0, were
-excluded from the limited API (stable ABI), and were not documented.

Misc/NEWS.d/next/Core and Builtins/2017-09-12-08-11-01.bpo-29832.Kuf2M7.rst

-Remove references to 'getsockaddrarg' from various socket error messages.
-Patch by Oren Milman.

Misc/NEWS.d/next/Core and Builtins/2017-09-25-20-36-24.bpo-31577.jgYsSA.rst

-Fix a crash in `os.utime()` in case of a bad ns argument. Patch by Oren
-Milman.

Misc/NEWS.d/next/Core and Builtins/2017-10-02-21-02-14.bpo-21983.UoC319.rst

-Fix a crash in `ctypes.cast()` in case the type argument is a ctypes
-structured data type. Patch by Eryk Sun and Oren Milman.

Misc/NEWS.d/next/Core and Builtins/2017-10-07-10-13-15.bpo-25862.FPYBA5.rst

-Fix assertion failures in the ``tell()`` method of ``io.TextIOWrapper``.
-Patch by Zackery Spytz.

Misc/NEWS.d/next/Core and Builtins/2017-10-30-12-44-50.bpo-31902.a07fa57.rst

-Fix the ``col_offset`` attribute for ast nodes ``ast.AsyncFor``,
-``ast.AsyncFunctionDef``, and ``ast.AsyncWith``. Previously, ``col_offset``
-pointed to the keyword after ``async``.

Misc/NEWS.d/next/Core and Builtins/2017-11-22-15-43-14.bpo-32117.-vloh8.rst

-Iterable unpacking is now allowed without parentheses in yield and return
-statements, e.g. ``yield 1, 2, 3, *rest``. Thanks to David Cuthbert for the
-change and Jordan Chapman for added tests.

Misc/NEWS.d/next/Core and Builtins/2017-11-26-00-59-22.bpo-10544.fHOM3V.rst

-Yield expressions are now disallowed in comprehensions and generator
-expressions except the expression for the outermost iterable.

Misc/NEWS.d/next/Core and Builtins/2017-12-12-13-43-13.bpo-32285.LzKSwz.rst

-New function unicodedata.is_normalized, which can check whether a string is
-in a specific normal form.

Misc/NEWS.d/next/Core and Builtins/2017-12-24-19-48-59.bpo-17611.P85kWL.rst

-Simplified the interpreter loop by moving the logic of unrolling the stack
-of blocks into the compiler. The compiler emits now explicit instructions
-for adjusting the stack of values and calling the cleaning up code for
-:keyword:`break`, :keyword:`continue` and :keyword:`return`.
-
-Removed opcodes :opcode:`BREAK_LOOP`, :opcode:`CONTINUE_LOOP`,
-:opcode:`SETUP_LOOP` and :opcode:`SETUP_EXCEPT`. Added new opcodes
-:opcode:`ROT_FOUR`, :opcode:`BEGIN_FINALLY` and :opcode:`CALL_FINALLY` and
-:opcode:`POP_FINALLY`. Changed the behavior of :opcode:`END_FINALLY` and
-:opcode:`WITH_CLEANUP_START`.

Misc/NEWS.d/next/Core and Builtins/2018-01-03-23-12-43.bpo-32489.SDEPHB.rst

-A :keyword:`continue` statement is now allowed in the :keyword:`finally`
-clause.

Misc/NEWS.d/next/Core and Builtins/2018-01-26-21-20-21.bpo-32583.Fh3fau.rst

-Fix possible crashing in builtin Unicode decoders caused by write
-out-of-bound errors when using customized decode error handlers.

Misc/NEWS.d/next/Core and Builtins/2018-01-29-14-36-37.bpo-32711.8hQFJP.rst

-Fix the warning messages for Python/ast_unparse.c. Patch by Stéphane Wirtel

Misc/NEWS.d/next/Core and Builtins/2018-02-01-10-16-28.bpo-32303.VsvhSl.rst

-Make sure ``__spec__.loader`` matches ``__loader__`` for namespace packages.

Misc/NEWS.d/next/Core and Builtins/2018-02-01-10-56-41.bpo-32305.dkU9Qa.rst

-For namespace packages, ensure that both ``__file__`` and
-``__spec__.origin`` are set to None.

Misc/NEWS.d/next/Core and Builtins/2018-02-02-08-50-46.bpo-31356.MNwUOQ.rst

-Remove the new API added in bpo-31356 (gc.ensure_disabled() context
-manager).

Misc/NEWS.d/next/Core and Builtins/2018-02-14-12-35-47.bpo-32836.bThJnx.rst

-Don't use temporary variables in cases of list/dict/set comprehensions

Misc/NEWS.d/next/Core and Builtins/2018-02-20-21-53-48.bpo-32889.J6eWy5.rst

-Update Valgrind suppression list to account for the rename of
-``Py_ADDRESS_IN_RANG`` to ``address_in_range``.

Misc/NEWS.d/next/Core and Builtins/2018-02-24-00-07-05.bpo-32925.e-7Ufh.rst

-Optimized iterating and containing test for literal lists consisting of
-non-constants: ``x in [a, b]`` and ``for x in [a, b]``. The case of all
-constant elements already was optimized.

Misc/NEWS.d/next/Core and Builtins/2018-02-24-21-51-42.bpo-32932.2cz31L.rst

-Make error message more revealing when there are non-str objects in ``__all__``.

Misc/NEWS.d/next/Core and Builtins/2018-02-25-10-52-40.bpo-32946.Lo09rG.rst

-Importing names from already imported module with "from ... import ..." is
-now 30% faster if the module is not a package.

Misc/NEWS.d/next/Core and Builtins/2018-02-27-13-36-21.bpo-17288.Gdj24S.rst

-Prevent jumps from 'return' and 'exception' trace events.

Misc/NEWS.d/next/Core and Builtins/2018-02-27-20-57-00.bpo-32911.cmKfco.rst

-Due to unexpected compatibility issues discovered during downstream beta
-testing, reverted :issue:`29463`. ``docstring`` field is removed from Module,
-ClassDef, FunctionDef, and AsyncFunctionDef ast nodes which was added in
-3.7a1.  Docstring expression is restored as a first statement in their body.
-Based on patch by Inada Naoki.

Misc/NEWS.d/next/Core and Builtins/2018-03-06-12-19-19.bpo-33005.LP-V2U.rst

-Fix a crash on fork when using a custom memory allocator (ex: using
-PYTHONMALLOC env var). _PyGILState_Reinit() and _PyInterpreterState_Enable()
-now use the default RAW memory allocator to allocate a new interpreters mutex
-on fork.

Misc/NEWS.d/next/Core and Builtins/2018-03-08-09-48-38.bpo-33026.QZA3Ba.rst

-Fixed jumping out of "with" block by setting f_lineno.

Misc/NEWS.d/next/Core and Builtins/2018-03-10-15-16-40.bpo-33041.-ak5Fk.rst

-Fixed bytecode generation for "async for" with a complex target. A
-StopAsyncIteration raised on assigning or unpacking will be now propagated
-instead of stopping the iteration.

Misc/NEWS.d/next/Core and Builtins/2018-03-14-21-42-17.bpo-25750.lxgkQz.rst

-Fix rare Python crash due to bad refcounting in ``type_getattro()`` if a
-descriptor deletes itself from the class. Patch by Jeroen Demeyer.

Misc/NEWS.d/next/Core and Builtins/2018-03-18-13-56-14.bpo-33041.XwPhI2.rst

-Added new opcode :opcode:`END_ASYNC_FOR` and fixes the following issues:
-
-* Setting global :exc:`StopAsyncIteration` no longer breaks ``async for``
-  loops.
-* Jumping into an ``async for`` loop is now disabled.
-* Jumping out of an ``async for`` loop no longer corrupts the stack.

Misc/NEWS.d/next/Core and Builtins/2018-03-19-00-59-20.bpo-33083.Htztjl.rst

-``math.factorial`` no longer accepts arguments that are not int-like.
-Patch by Pablo Galindo.

Misc/NEWS.d/next/Core and Builtins/2018-03-22-23-09-06.bpo-33018.0ncEJV.rst

-Improve consistency of errors raised by ``issubclass()`` when called with a
-non-class and an abstract base class as the first and second arguments,
-respectively. Patch by Josh Bronson.

Misc/NEWS.d/next/Core and Builtins/2018-03-25-19-25-14.bpo-33138.aSqudH.rst

-Changed standard error message for non-pickleable and non-copyable types. It
-now says "cannot pickle" instead of "can't pickle" or "cannot serialize".

Misc/NEWS.d/next/Core and Builtins/2018-03-25-19-49-06.bpo-33053.V3xlsH.rst

-When using the -m switch, sys.path[0] is now explicitly expanded as the
-*starting* working directory, rather than being left as the empty path
-(which allows imports from the current working directory at the time of the
-import)

Misc/NEWS.d/next/Core and Builtins/2018-04-02-09-32-40.bpo-33199.TPnxQu.rst

-Fix ``ma_version_tag`` in dict implementation is uninitialized when copying
-from key-sharing dict.

Misc/NEWS.d/next/Core and Builtins/2018-04-03-00-30-25.bpo-29922.CdLuMl.rst

-Improved error messages in 'async with' when ``__aenter__()`` or
-``__aexit__()`` return non-awaitable object.

Misc/NEWS.d/next/Core and Builtins/2018-04-03-00-58-41.bpo-33205.lk2F3r.rst

-Change dict growth function from ``round_up_to_power_2(used*2+hashtable_size/2)`` to
-``round_up_to_power_2(used*3)``.  Previously, dict is shrinked only when ``used == 0``.
-Now dict has more chance to be shrinked.

Misc/NEWS.d/next/Core and Builtins/2018-04-05-22-20-44.bpo-33231.3Jmo0q.rst

-Fix potential memory leak in ``normalizestring()``.

Misc/NEWS.d/next/Core and Builtins/2018-04-13-22-31-09.bpo-33176.PB9com.rst

-Add a ``toreadonly()`` method to memoryviews.

Misc/NEWS.d/next/Core and Builtins/2018-04-14-11-02-57.bpo-30455.ANRwjo.rst

-The C and Python code and the documentation related to tokens are now generated
-from a single source file :file:`Grammar/Tokens`.

Misc/NEWS.d/next/Core and Builtins/2018-04-14-13-12-50.bpo-33270.UmVV6i.rst

-Intern the names for all anonymous code objects.  Patch by Zackery Spytz.

Misc/NEWS.d/next/Core and Builtins/2018-04-17-01-24-51.bpo-33234.l9IDtp.rst

-The list constructor will pre-size and not over-allocate when
-the input lenght is known.

Misc/NEWS.d/next/Core and Builtins/2018-04-18-12-23-30.bpo-33306.tSM3cp.rst

-Improved syntax error messages for unbalanced parentheses.