Python 3.9.0b1

Misc/NEWS.d/next/Library/2019-09-01-15-17-49.bpo-24416.G8Ww1U.rst

-The ``isocalendar()`` methods of :class:`datetime.date` and
-:class:`datetime.datetime` now return a :term:`named tuple`
-instead of a :class:`tuple`.

Misc/NEWS.d/next/Library/2019-12-15-19-17-10.bpo-39058.7ci-vd.rst

-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.

Misc/NEWS.d/next/Library/2020-03-21-05-26-38.bpo-40025.DTLtyq.rst

-Raise TypeError when _generate_next_value_ is defined after members. Patch by Ethan Onstott.
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Misc/NEWS.d/next/Library/2020-04-05-04-16-14.bpo-40192.nk8uRJ.rst

-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.

Misc/NEWS.d/next/Library/2020-04-07-23-44-06.bpo-39075.hgck3j.rst

-The repr for :class:`types.SimpleNamespace` is now insertion ordered rather
-than alphabetical.

Misc/NEWS.d/next/Library/2020-04-14-09-54-35.bpo-40273.IN73Ks.rst

-:class:`types.MappingProxyType` is now reversible.

Misc/NEWS.d/next/Library/2020-04-14-22-31-27.bpo-40291._O8hXn.rst

-Add support for CAN_J1939 sockets (available on Linux 5.4+)

Misc/NEWS.d/next/Library/2020-04-25-20-00-58.bpo-40389.FPA6f0.rst

-``repr()`` now returns ``typing.Optional[T]`` when called for ``typing.Union`` of two types, one of which is ``NoneType``.
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Misc/NEWS.d/next/Library/2020-04-25-23-14-11.bpo-40375.5GuK2A.rst

-:meth:`imaplib.IMAP4.unselect` is added. Patch by Dong-hee Na.

Misc/NEWS.d/next/Library/2020-04-27-00-51-40.bpo-39791.wv8Dxn.rst

-Added ``files()`` function to importlib.resources with support for subdirectories in package data, matching backport in importlib_resources 1.5.
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Misc/NEWS.d/next/Library/2020-04-27-14-48-43.bpo-39966.N5yXUe.rst

-Revert bpo-25597. :class:`unittest.mock.MagicMock` with wraps' set uses
-default return values for magic methods.

Misc/NEWS.d/next/Library/2020-04-27-17-19-09.bpo-30966._5lDx-.rst

-Add a new :meth:`~multiprocessing.SimpleQueue.close` method to the
-:class:`~multiprocessing.SimpleQueue` class to explicitly close the queue.

Misc/NEWS.d/next/Library/2020-04-27-20-27-39.bpo-30966.Xmtlqu.rst

-``Process.shutdown(wait=True)`` of :mod:`concurrent.futures` now closes
-explicitly the result queue.

Misc/NEWS.d/next/Library/2020-04-28-18-25-27.bpo-39995.WmA3Gk.rst

-Fix a race condition in concurrent.futures._ThreadWakeup: access to
-_ThreadWakeup is now protected with the shutdown lock.

Misc/NEWS.d/next/Library/2020-04-28-18-59-48.bpo-40394.Yi5uuM.rst

-Added default arguments to :meth:`difflib.SequenceMatcher.find_longest_match()`.
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Misc/NEWS.d/next/Library/2020-04-29-18-02-16.bpo-40286.txbQNx.rst

-Remove ``_random.Random.randbytes()``: the C implementation of
-``randbytes()``. Implement the method in Python to ease subclassing:
-``randbytes()`` now directly reuses ``getrandbits()``.

Misc/NEWS.d/next/Library/2020-04-30-22-04-58.bpo-40453.ggz7sl.rst

-Add ``isolated=True`` keyword-only parameter to
-``_xxsubinterpreters.create()``. An isolated subinterpreter cannot spawn
-threads, spawn a child process or call ``os.fork()``.

Misc/NEWS.d/next/Library/2020-04-30-22-25-08.bpo-32494.1xaU5l.rst

-Update :mod:`dbm.gnu` to use gdbm_count if possible when calling
-:func:`len`. Patch by Dong-hee Na.

Misc/NEWS.d/next/Library/2020-05-01-00-22-58.bpo-39305.Cuwu_H.rst

-Update :mod:`nntplib` to merge :class:`nntplib.NNTP` and
-:class:`nntplib._NNTPBase`. Patch by Dong-hee Na.

Misc/NEWS.d/next/Library/2020-05-01-23-24-25.bpo-39435.mgb6ib.rst

-The first argument of :func:`pickle.loads` is now positional-only.