The patch needed for 2.7 should make the test more stable on 3.x also.

bpo-35922: Fix RobotFileParser when robots.txt has no relevant crawl delay or request rate (GH-11791)
Co-Authored-By: Tal Einat <taleinat+github@gmail.com>

bpo-28009: Fix uuid SkipUnless logic to be based on platform programs capable of introspection (GH-12777)

uuid could try fallback methods that had no chance of working on a particular
platform, and this could cause spurious test failures, as well as degraded
performance as fallback options were tried and failed.

This fixes both the uuid module and its test's SkipUnless logic to use a
prefiltered list of techniques that may at least potentially work on that platform.

Patch by Michael Felt (aixtools).

To reflect the one we're using in production.

* Increase timeout for PGO builds in Windows release
* Fix test step failures
* Disable MinGW step properly
* Fix embeddable distro name

bpo-35537, bpo-35876: Fix also test_start_new_session() of
test_subprocess: use os.getsid() rather than os.getpgid().

In a subinterpreter, spawning a daemon thread now raises an
exception. Daemon threads were never supported in subinterpreters.
Previously, the subinterpreter finalization crashed with a Pyton
fatal error if a daemon thread was still running.

* Add _thread._is_main_interpreter()
* threading.Thread.start() now raises RuntimeError if the thread is a
  daemon thread and the method is called from a subinterpreter.
* The _thread module now uses Argument Clinic for the new function.
* Use textwrap.dedent() in test_threading.SubinterpThreadingTests

Document reference cycle and resurrected objects issues in
sys.unraisablehook() and threading.excepthook() documentation.

Fix test.support.catch_unraisable_exception(): __exit__() no longer
ignores unraisable exceptions.

Fix test_io test_writer_close_error_on_close(): use a second
catch_unraisable_exception() to catch the BufferedWriter unraisable
exception.

This PR adds missing details in the [`concurrent.futures`](https://docs.python.org/3/library/concurrent.futures.html) documentation:

* the mention that `Future.cancel` also returns `False` if the call finished running;
* the mention of the states for `Future` that did not complete: pending or running.

Join the thread to prevent leaking a running thread and leaking a
reference.

Cleanup also the test:

* asyncioWindowsProactorEventLoopPolicy became the default policy,
  there is no need to set it manually.
* Only start the thread once the loop is running.
* Use a shorter sleep in the thread (100 ms rather than 1 sec).
* Use close_loop(loop) rather than loop.close().
* Use longer variable names.

Fix a regression introduced by af8646c8 that was causing code of the form:

if True and False:
   do_something()

to be optimized incorrectly, eliminating the block.

This is the followup  for issue36084



https://bugs.python.org/issue37077

* Replace global var Py_VerboseFlag with interp->config.verbose.
* Add _PyErr_NoMemory(tstate) function.
* Add tstate parameter to _PyEval_SetCoroutineOriginTrackingDepth()
  and move the function to the internal API.
* Replace _PySys_InitMain(runtime, interp)
  with _PySys_InitMain(runtime, tstate).

The peephole optimizer was not optimizing correctly bytecode after negative deltas were introduced. This is due to the fact that some special values (255) were being searched for in both instruction pointer delta and line number deltas.

It would raise ValueError("Paths don't have the same drive") if the paths on different drivers, which is not documented.


os.path.commonpath raises ValueError when the *paths* are in different drivers, but it is not documented.
Update the document according @Windsooon 's suggestion.
It actually raise ValueError according line 355 of [test of path](https://github.com/python/cpython/blob/master/Lib/test/test_ntpath.py) 


https://bugs.python.org/issue6689

The __exit__() method of test.support.catch_unraisable_exception
context manager now ignores unraisable exception raised when clearing
self.unraisable attribute.

Allow pure Python implementation of pickle to work
even when the C _pickle module is unavailable.

Fix test_pickle when _pickle is missing: declare PyPicklerHookTests
outside "if has_c_implementation:" block.

Remove the _tstate_lock from _shutdown_locks, don't remove None.

PyAST_obj2mod_ex() is similar to PyAST_obj2mod() with an additional
'feature_version' parameter which is unused.