Calling _PyRuntime_Initialize() after _PyRuntime_Finalize() now re-initializes
_PyRuntime structure. Previously, _PyRuntime_Initialize() did
nothing in that case.

https://bugs.python.org/issue36324

* _PyPathConfig_ComputeSysPath0() now returns 0 if argv is empty.
* Cleanup also _PyPathConfig_ComputeSysPath0() code: move variables
  definitions closer to where they are used.

At Python initialization, the current directory is no longer
prepended to sys.path if it has been removed.

Rename _PyPathConfig_ComputeArgv0() to
_PyPathConfig_ComputeSysPath0() to avoid confusion between argv[0]
and sys.path[0].

Ensure that _PyRuntime_Finalize() is always call. This change fix a
few memory leaks when running "python3 -V".

When Python is compiled with Valgrind support, release Unicode
interned strings at exit in _PyUnicode_Fini().

* Rename _Py_ReleaseInternedUnicodeStrings() to
  unicode_release_interned() and make it private.
* unicode_release_interned() is now called from _PyUnicode_Fini():
  it must be called with a running Python thread state for TRASHCAN,
  it cannot be called from pymain_free().
* Don't display statistics on interned strings at exit anymore

_PyEval_FiniThreads() now free the pending lock.

Modules/_sqlite/cursor.c uses "y#" format.
It didn't declare PY_SSIZE_T_CLEAN, but the argument is Py_ssize_t already.

_PyPreConfig_Read() now free 'old_old' at exit.

* Use Py_ARRAY_LENGTH() rather than hardcoded MAXPATHLEN in getpath.c.
* Pass string length to functions modifying strings.

Python initialization now fails if decoding pybuilddir.txt
configuration file fails at startup.

_PyPathConfig_Calculate() now reports memory allocation failure and
decoding error on decoding pybuilddir.txt content from
UTF-8/surrogateescape.

Replace Py_FatalError() with _PyInitError to let the caller handle
the fatal error.

bpo-36301, bpo-36333:

* Fix memory allocator used by _PyPathConfig_ClearGlobal():
  force the default allocator.
* _PyPreConfig_ReadFromArgv(): free init_ctype_locale memory.
* pymain_main(): call pymain_free() on init error
Co-Authored-By: Stéphane Wirtel <stephane@wirtel.be>

Also,  deprecate the *_field_types* attributes which duplicated the information in *\__annotations__*.


https://bugs.python.org/issue36320

The last parameter of _Py_wreadlink(), _Py_wrealpath() and
_Py_wgetcwd() is a length, not a size: number of characters including
the trailing NUL character.

Enhance also documentation of error conditions.

The test test_customize_compiler() now mocks all sysconfig variables
and all environment variables used by customize_compiler().

* bpo-36329: Declare the version of Python to use for Tools/scripts/serve.py

* Add the blurb entry

* Fix handshake timeout leak in asyncio/sslproto

Refs MagicStack/uvloop#222

* Break circular ref _SSLPipe <-> SSLProtocol

* bpo-34745: Fix asyncio ssl memory leak

* Break circular ref SSLProtocol <-> UserProtocol

* Add NEWS entry

bpo-35493: Use Process.sentinel instead of sleeping for polling worker status in multiprocessing.Pool (#11488)

* bpo-35493: Use Process.sentinel instead of sleeping for polling worker status in multiprocessing.Pool

* Use self-pipe pattern to avoid polling for changes

* Refactor some variable names and add comments

* Restore timeout and poll

* Use reader object only on wait()

* Recompute worker sentinels every time

* Remove timeout and use change notifier

* Refactor some methods to be overloaded by the ThreadPool, document the cache class and fix typos

ProcessPoolExecutor workers will hold the return value of their last task in memory until the next task is received. Since the return value has already been propagated to the parent process's Future (or has been discarded by this point), the object can be safely released.

* Replace external recipe link with a link to the dataclasses module.

* Highlight the class definition syntax for typing.NamedTuple
  and add an example for clarity.