Affected classes are bytearray, array, deque, defaultdict, count and repeat.

Previously ensurepip would always report success, even if the
pip installation failed.

Fix a memory corruption in getpath.c due to mixed memory allocators
between Py_GetPath() and Py_SetPath().

The fix use the Raw allocator to mimic the windows version.

This patch should be used from python3.6 to the current version

for more details, see the bug report and
  https://github.com/pyinstaller/pyinstaller/issues/2812

* bpo-31536: Avoid wholesale rebuild after `make regen-all`

* Add NEWS

This fixes a regression from Python 2.  To get optional subparsers,
use the new parameter ``add_subparsers(required=False)``.

Patch by Anthony Sottile.

This is based on
https://github.com/ghaering/pysqlite/commit/40b349cadbd87c42f70fc92e5e1aee6d02564c6d#diff-0489411409cd2934730e88bf7767790,
though we can be a bit more aggressive about deleting code.

Don't export the cell_set_contents() symbol in the C API.

This one line of Serhiy Storchacka's bpo-31500 patch for is needed for other issues.

* bpo-31479: Always reset the signal alarm in tests

Use "try: ... finally: signal.signal(0)" pattern to make sure that
tests don't "leak" a pending fatal signal alarm.

* Move two more alarm() calls into the try block

Fix also typo: replace signal.signal(0) with signal.alarm(0)

* Move another signal.alarm() into the try block

bpo-31293: Fix crashes in truediv and mul of a timedelta by a float with a bad as_integer_ratio() method. (#3227)

bpo-31315: Fix an assertion failure in imp.create_dynamic(), when spec.name is not a string. (#3257)

* Trivial cleanups following bpo-31370

* Also cleanup the "importlib._bootstrap_external" module

* bpo-31499, xml.etree: Fix xmlparser_gc_clear() crash

xml.etree: xmlparser_gc_clear() now sets self.parser to NULL to prevent a
crash in xmlparser_dealloc() if xmlparser_gc_clear() was called previously
by the garbage collector, because the parser was part of a reference cycle.
Co-Authored-By: Serhiy Storchaka <storchaka@gmail.com>

This reverses a never-released regression resulting from bpo-31287.

This function returns the last component of tp_name after a dot.
Returns tp_name itself if it doesn't contain a dot.

bpo-31482: Missing bytes support for random.seed() version 1 #3614

Shorten the comment to: "using integer format specifier"

bpo-31490: Fix an assertion failure in ctypes in case an _anonymous_ attr is defined only outside _fields_. (#3615)

Canceling timers prevents a warning message when test_idle completes.
(This is the minimum fix needed before upcoming releases.)

Provide additional examples of using format specifiers in f-strings
Added examples for using integer and date format specifiers.

When apply changes, call .reload on each class with non-key options.
Change ParenMatch so that updates affect current instances.

The concrete PyDict_* API is used to interact with PyInterpreterState.modules in a number of places. This isn't compatible with all dict subclasses, nor with other Mapping implementations. This patch switches the concrete API usage to the corresponding abstract API calls.

We also add a PyImport_GetModule() function (and some other helpers) to reduce a bunch of code duplication.