- Issue #27066: Fixed SystemError if a custom opener (for open()) returns a
negative number without setting an exception.
+- Issue #26983: float() now always return an instance of exact float.
+ The deprecation warning is emitted if __float__ returns an instance of
+ a strict subclass of float. In a future versions of Python this can
+ be an error.
+
+- Issue #27097: Python interpreter is now about 7% faster due to optimized
+ instruction decoding. Based on patch by Demur Rumed.
+
+- Issue #26647: Python interpreter now uses 16-bit wordcode instead of bytecode.
+ Patch by Demur Rumed.
+
+- Issue #23275: Allow assigning to an empty target list in round brackets:
+ () = iterable.
+
+- Issue #27243: Update the __aiter__ protocol: instead of returning
+ an awaitable that resolves to an asynchronous iterator, the asynchronous
+ iterator should be returned directly. Doing the former will trigger a
+ PendingDeprecationWarning.
+
+
+Library
+-------
+
+- Issue #27029: Removed deprecated support of universal newlines mode from
+ ZipFile.open().
+
+- Issue #27030: Unknown escapes consisting of ``'\'`` and ASCII letter in
+ regular expressions now are errors. The re.LOCALE flag now can be used
+ only with bytes patterns.
+
+- Issue #27186: Add os.PathLike support to DirEntry (part of PEP 519).
+ Initial patch by Jelle Zijlstra.
+
+- Issue #20900: distutils register command now decodes HTTP responses
+ correctly. Initial patch by ingrid.
+
+- Issue #27186: Add os.PathLike support to pathlib, removing its provisional
+ status (part of PEP 519). Initial patch by Dusty Phillips.
+
+- Issue #27186: Add support for os.PathLike objects to os.fsencode() and
+ os.fsdecode() (part of PEP 519).
+
+- Issue #27186: Introduce os.PathLike and os.fspath() (part of PEP 519).
+
+- A new version of typing.py provides several new classes and
+ features: @overload outside stubs, Reversible, DefaultDict, Text,
+ ContextManager, Type[], NewType(), TYPE_CHECKING, and numerous bug
+ fixes (note that some of the new features are not yet implemented in
+ mypy or other static analyzers). Also classes for PEP 492
+ (Awaitable, AsyncIterable, AsyncIterator) have been added (in fact
+ they made it into 3.5.1 but were never mentioned).
+
+- Issue #25738: Stop http.server.BaseHTTPRequestHandler.send_error() from
+ sending a message body for 205 Reset Content. Also, don't send Content
+ header fields in responses that don't have a body. Patch by Susumu
+ Koshiba.
+
+- Issue #21313: Fix the "platform" module to tolerate when sys.version
+ contains truncated build information.
+
+- Issue #26839: On Linux, :func:`os.urandom` now calls ``getrandom()`` with
+ ``GRND_NONBLOCK`` to fall back on reading ``/dev/urandom`` if the urandom
+ entropy pool is not initialized yet. Patch written by Colm Buckley.
+
+- Issue #23883: Added missing APIs to __all__ to match the documented APIs
+ for the following modules: cgi, mailbox, mimetypes, plistlib and smtpd.
+ Patches by Jacek Kołodziej.
+
+- Issue #27164: In the zlib module, allow decompressing raw Deflate streams
+ with a predefined zdict. Based on patch by Xiang Zhang.
+
+- Issue #24291: Fix wsgiref.simple_server.WSGIRequestHandler to completely
+ write data to the client. Previously it could do partial writes and
+ truncate data. Also, wsgiref.handler.ServerHandler can now handle stdout
+ doing partial writes, but this is deprecated.
+
+- Issue #21272: Use _sysconfigdata.py to initialize distutils.sysconfig.
+
+- Issue #19611: :mod:`inspect` now reports the implicit ``.0`` parameters
+ generated by the compiler for comprehension and generator expression scopes
+ as if they were positional-only parameters called ``implicit0``.
+ Patch by Jelle Zijlstra.
+
+- Issue #26809: Add ``__all__`` to :mod:`string`. Patch by Emanuel Barry.
+
+- Issue #26373: subprocess.Popen.communicate now correctly ignores
+ BrokenPipeError when the child process dies before .communicate()
+ is called in more/all circumstances.
+
+- signal, socket, and ssl module IntEnum constant name lookups now return a
+ consistent name for values having multiple names. Ex: signal.Signals(6)
+ now refers to itself as signal.SIGALRM rather than flipping between that
+ and signal.SIGIOT based on the interpreter's hash randomization seed.
+
+- Issue #27167: Clarify the subprocess.CalledProcessError error message text
+ when the child process died due to a signal.
+
+- Issue #25931: Don't define socketserver.Forking* names on platforms such
+ as Windows that do not support os.fork().
+
+- Issue #21776: distutils.upload now correctly handles HTTPError.
+ Initial patch by Claudiu Popa.
+
+- Issue #26526: Replace custom parse tree validation in the parser
+ module with a simple DFA validator.
+
+- Issue #27114: Fix SSLContext._load_windows_store_certs fails with
+ PermissionError
+
+- Issue #18383: Avoid creating duplicate filters when using filterwarnings
+ and simplefilter. Based on patch by Alex Shkop.
+
+- Issue #23026: winreg.QueryValueEx() now return an integer for REG_QWORD type.
+
+- Issue #26741: subprocess.Popen destructor now emits a ResourceWarning warning
+ if the child process is still running.
+
+- Issue #27056: Optimize pickle.load() and pickle.loads(), up to 10% faster
+ to deserialize a lot of small objects.
+
+- Issue #21271: New keyword only parameters in reset_mock call.
+
+- Issue #25548: Showing memory address of class objects in repl.
+
+IDLE
+----
+
+- Issue #5124: Paste with text selected now replaces the selection on X11.
+ This matches how paste works on Windows, Mac, most modern Linux apps,
+ and ttk widgets. Original patch by Serhiy Storchaka.
+
+- Issue #24750: Switch all scrollbars in IDLE to ttk versions.
+ Where needed, minimal tests are added to cover changes.
+
+- Issue #24759: IDLE requires tk 8.5 and availability ttk widgets.
+ Delete now unneeded tk version tests and code for older versions.
+ Add test for IDLE syntax colorizoer.
+
+- Issue #27239: idlelib.macosx.isXyzTk functions initialize as needed.
+
+- Issue #27262: move Aqua unbinding code, which enable context menus, to maxosx.
+
+- Issue #24759: Make clear in idlelib.idle_test.__init__ that the directory
+ is a private implementation of test.test_idle and tool for maintainers.
+
+- Issue #27196: Stop 'ThemeChanged' warnings when running IDLE tests.
+ These persisted after other warnings were suppressed in #20567.
+ Apply Serhiy Storchaka's update_idletasks solution to four test files.
+ Record this additional advice in idle_test/README.txt
+
+- Issue #20567: Revise idle_test/README.txt with advice about avoiding
+ tk warning messages from tests. Apply advice to several IDLE tests.
+
+- Issue #24225: Update idlelib/README.txt with new file names
+ and event handlers.
+
+- Issue #27156: Remove obsolete code not used by IDLE. Replacements:
+ 1. help.txt, replaced by help.html, is out-of-date and should not be used.
+ Its dedicated viewer has be replaced by the html viewer in help.py.
+ 2. ‘`import idlever; I = idlever.IDLE_VERSION`’ is the same as
+ ‘`import sys; I = version[:version.index(' ')]`’
+ 3. After ‘`ob = stackviewer.VariablesTreeItem(*args)`’,
+ ‘`ob.keys() == list(ob.object.keys)`’.
+ 4. In macosc, runningAsOSXAPP == isAquaTk; idCarbonAquaTk == isCarbonTk
+
+- Issue #27117: Make colorizer htest and turtledemo work with dark themes.
+ Move code for configuring text widget colors to a new function.
+
+- Issue #24225: Rename many `idlelib/*.py` and `idle_test/test_*.py` files.
+ Edit files to replace old names with new names when the old name
+ referred to the module rather than the class it contained.
+ See the issue and IDLE section in What's New in 3.6 for more.
+
+- Issue #26673: When tk reports font size as 0, change to size 10.
+ Such fonts on Linux prevented the configuration dialog from opening.
+
+- Issue #21939: Add test for IDLE's percolator.
+ Original patch by Saimadhav Heblikar.
+
+- Issue #21676: Add test for IDLE's replace dialog.
+ Original patch by Saimadhav Heblikar.
+
+- Issue #18410: Add test for IDLE's search dialog.
+ Original patch by Westley Martínez.
+
+- Issue #21703: Add test for undo delegator. Patch mostly by
+ Saimadhav Heblikar .
+
+- Issue #27044: Add ConfigDialog.remove_var_callbacks to stop memory leaks.
+
+- Issue #23977: Add more asserts to test_delegator.
+
++Documentation
++-------------
++
++- Issue #22558: Add remaining doc links to source code for Python-coded modules.
++ Patch by Yoni Lavi.
++
+Tests
+-----
+
+- Issue #25285: regrtest now uses subprocesses when the -j1 command line option
+ is used: each test file runs in a fresh child process. Before, the -j1 option
+ was ignored.
+
+- Issue #25285: Tools/buildbot/test.bat script now uses -j1 by default to run
+ each test file in fresh child process.
+
+Windows
+-------
+
+- Issue #27064: The py.exe launcher now defaults to Python 3.
+ The Windows launcher ``py.exe`` no longer prefers an installed
+ Python 2 version over Python 3 by default when used interactively.
+
+Build
+-----
+
+- Issue #27229: Fix the cross-compiling pgen rule for in-tree builds. Patch
+ by Xavier de Gaye.
+
+- Issue #26930: Update OS X 10.5+ 32-bit-only installer to build
+ and link with OpenSSL 1.0.2h.
+
+Misc
+----
+
+- Issue #17500, and https://github.com/python/pythondotorg/issues/945: Remove
+ unused and outdated icons.
+
+C API
+-----
+
+- Issue #27186: Add the PyOS_FSPath() function (part of PEP 519).
+
+- Issue #26282: PyArg_ParseTupleAndKeywords() now supports positional-only
+ parameters.
+
+Tools/Demos
+-----------
+
+- Issue #26282: Argument Clinic now supports positional-only and keyword
+ parameters in the same function.
+
+
+What's New in Python 3.6.0 alpha 1?
+===================================
+
+Release date: 2016-05-16
+
+Core and Builtins
+-----------------
+
- Issue #20041: Fixed TypeError when frame.f_trace is set to None.
Patch by Xavier de Gaye.
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